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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Richard C. Dugdale; Frances P. Wilkerson; Fei Chai; Richard A. Feely;

    The equatorial Pacific Ocean is the largest natural source of CO2 to the atmosphere, and it significantly impacts the global carbon cycle. Much of the large flux of upwelled CO2 to the atmosphere is due to incomplete use of the available nitrate (NO3) and low net productivity. This high‐nutrient low‐chlorophyll (HNLC) condition of the equatorial upwelling zone (EUZ) has been interpreted from modeling efforts to be due to low levels of silicate (Si(OH)4) that limit the new production of diatoms. These ideas were incorporated into an ecosystem model, CoSINE. This model predicted production by the larger phytoplankton and the picoplankton and effects on air‐sea CO2 fluxes in the Pacific Ocean. However, there were no size‐fractionated rates available for verification. Here we report the first size‐fractionated new and regenerated production rates (obtained with 15N−NO3 and 15N−NH4 incubations) for the EUZ with the objective of validating the conceptual basis and functioning of the CoSINE model. Specifically, the larger phytoplankton (with cell diameters > 5 μm) had greater rates of new production and higher f‐ratios (i.e., the proportion of NO3 to the sum of NO3 and NH4 uptake) than the picoplankton that had high rates of NH4 uptake and low f‐ratios. The way that the larger primary producers are regulated in the EUZ is discussed using a continuous chemostat approach. This combines control of Si(OH)4 production by supply rate (bottom‐up) and control of growth rate (or dilution) by grazing (top‐down control).

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Global Biogeochemica...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Global Biogeochemical Cycles
    Article . 2007 . Peer-reviewed
    License: Wiley Online Library User Agreement
    Data sources: Crossref
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Global Biogeochemica...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Global Biogeochemical Cycles
      Article . 2007 . Peer-reviewed
      License: Wiley Online Library User Agreement
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: M.I. Orlyuk; A. A. Romenets;

    The geomagnetic field, along with other environmental factors, is a necessary component of life on the Earth. Currently, there are relevant ecological standards for the values of constant and variable fields. Taking them into account, it is possible to determine the conditions necessary for the normal functioning of biological objects in general and humans in particular. In a number of regulations, certain limit values for a constant magnetic field are introduced, as well as the maximum permissible time of a human being stay in such fields. In this regard, the article considers the spatiotemporal change in induction B on the Earth’s surface using the example of its main magnetic field according to the international model IGRF-13 for the time interval 1950—2020. In more detail for this time interval, the induction module B and its perturbation were analyzed for geomagnetically different regions that are, namely, the territories of Ukraine, of Yamal (Russia) and around the Ukrainian Antarctic Akademik Vernadsky station. For the planet in whole, a significant decrease in the geomagnetic field is shown, against the background of which its sharp jumps are observed (in 1960—1965, 1980—1985 and in 2000—2005), and after 2005 to the present, a deceleration in the decrease of the geomagnetic field is observed. Against the background of a decrease in the geomagnetic field of the planet, areas with extreme changes both in the direction of increase (Ukraine, Yamal) and decrease (AV station) are distinguished. The spatiotemporal changes in the geomagnetic field detected on the Earth’s surface determine the structure and dynamics of its magnetosphere, which by-turn affects the nature of the interaction with it of solar wind substance and of cosmic radiation, as well as the flow altitudes of magnetospheric and ionospheric currents. According to the distribution of the geomagnetic field anomalies on the surface of the planet, as well as to their changes over the studied time interval, regions with different (as compared with proposed ecological norms) values of the constant magnetic field and its disturbances are distinguished. In particular, for the epoch of 2020, for the territory in the vicinity of the AV station, the induction vector module B is on average 15,000 nT less than its value for the territory of Ukraine and 25,000 nT — of Yamal. Significant changes in the geomagnetic field were determined: an increase of 1765 nT for Ukraine, 1418 nT for Yamal and a decrease of — 7081 nT in the vicinity of AV station. At the same time, the perturbation of the geomagnetic field of the territory of Ukraine is within its ecological norm, deviates from it in the direction of increase on the Yamal Peninsula, and near the AV station it will soon go beyond its limits in the direction of decrease, while maintaining modern field changes.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Geofizicheskiy Zhurn...arrow_drop_down
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    Geofizicheskiy Zhurnal
    Article . 2020 . Peer-reviewed
    Data sources: Crossref
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Geofizicheskiy Zhurnal
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Geofizicheskiy Zhurn...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Geofizicheskiy Zhurnal
      Article . 2020 . Peer-reviewed
      Data sources: Crossref
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Geofizicheskiy Zhurnal
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: I Grünberg; J Boike;
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://doi.org/10.4...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://doi.org/10.4...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: M. Mohammad Ali; Waseem Ahmad; maqsood ali malik; fahed ahmad; +1 Authors
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Tom Dunkley Jones; Hayley Manners; Murray Hoggett; Sandra Kirtland Turner; +7 Authors

    Abstract. The response of the Earth System to greenhouse-gas driven warming is of critical importance for the future trajectory of our planetary environment. Hypethermal events – past climate transients with significant global-scale warming – can provide insights into the nature and magnitude of these responses. The largest hyperthermal of the Cenozoic was the Palaeocene-Eocene Thermal Maximum (PETM ~ 56 Ma). Here we present a new high-resolution cyclostratigraphy for the classic PETM section at Zumaia, Spain. With this new age model we are able to demonstrate that detrital sediment accumulation rates within this continental margin section increased more than four-fold during the PETM, representing a radical change in regional hydrology that drove dramatic increases in terrestrial to marine sediment flux. During the body of the PETM, orbital-scale variations in bulk sediment Si/Fe ratios are evidence for the continued orbital pacing of sediment erosion and transport processes, most likely linked to precession controls on sub-tropical hydroclimates. Most remarkable is that detrital accumulation rates remain high throughout the body of the PETM, and even reach peak values during the recovery phase of the characteristic PETM carbon isotope excursion (CIE). Using a series of Earth System Model inversions, we demonstrate that the silicate weathering feedback alone is insufficient to recover the PETM CIE, and that active organic carbon burial is required to match the observed dynamics of the CIE. Further, that the period of maximum organic carbon sequestration coincides with the peak in detrital accumulation rates observed at Zumaia. Based on these results, we hypothesize that precession controls on tropical and sub-tropical hydroclimates, and the sediment dynamics associated with this variation, play a significant role in the timing of the rapid climate and CIE recovery from peak-PETM conditions.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://www.clim-pas...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://www.clim-past.net/14/1...
    Preprint
    License: CC BY
    Data sources: UnpayWall
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://doi.org/10.5194/cp-201...
    Preprint . 2017
    License: CC BY
    Data sources: Crossref
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ https://www.clim-pas...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      https://www.clim-past.net/14/1...
      Preprint
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      https://doi.org/10.5194/cp-201...
      Preprint . 2017
      License: CC BY
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: G. Wilson; J. Conrad; J. Anderson; A. Swidinsky; +2 Authors

    Abstract. Recent advancements and the widespread availability of low-cost microcontrollers and electronic components have created new opportunities for developing and using low-cost, open-source instrumentation for near-surface geophysical investigations. Geophysical methods that do not require ground contact, such as frequency-domain electromagnetics, allow one or two users to quickly acquire significant amounts of ground resistivity data in a cost-effective manner. The Colorado School of Mines electromagnetic system (CSM-EM) is a proof-of-concept instrument capable of sensing conductive objects in near-surface environments, and is similar in concept to commercial-grade equipment while costing under USD 400 to build. We tested the functionality of the CSM-EM system in a controlled laboratory setting during the design phase and validated it over a conductive target in an outdoor environment. The transmitter antenna can generate a current of over 2.5 A, and emit signals that are detectable by a receiver antenna at offsets of up to 25 m. The system requires minor refitting to change the functioning frequency, and has been operationally validated at 0.4 and 1.6 kHz. The receiver signal can be measured by off-the-shelf digital multimeters. Future directions will focus on improving the electronic and mechanical stability of the CSM-EM with the goal of using acquired data to make quantitative measurements of subsurface resistivity.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Copernicus Publicati...arrow_drop_down
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    Copernicus Publications
    Other literature type . 2022
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    Geoscientific Instrumentation, Methods and Data Systems (GI)
    Article . 2022 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://doi.org/10.5194/egusph...
    Preprint . 2022 . Peer-reviewed
    License: CC BY
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    DOAJ
    Article . 2022
    Data sources: DOAJ
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      Copernicus Publications
      Other literature type . 2022
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      Geoscientific Instrumentation, Methods and Data Systems (GI)
      Article . 2022 . Peer-reviewed
      License: CC BY
      Data sources: Crossref
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      https://doi.org/10.5194/egusph...
      Preprint . 2022 . Peer-reviewed
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      DOAJ
      Article . 2022
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    Authors: Yasuto Tachikawa; Michiharu Shiiba; Shinichi Harai; Takuma Takasao;

    合成開ロレーダ(SAR)によって取得される陸域の後方散乱係数には, 地表面の凹凸が影響する. この性質を利用して, 合成開ロレーダデータから空気力学的粗度の空間的分布図を作成することを試みる. 琵琶湖北東域において, JERS-1によるLバンドSAR画像, ERS-1によるCバンドSAR画像からそれぞれ粗度分布図を作成し, 国土数値情報の土地利用情報から作成した粗度分布図(Kondo&Yamazawa, 1986による手法)と比較した. その結果, JERS-1によるSAR画像から作成した分布図と国土数値情報から作成した分布図とは良い対応を示すことがわかった.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ JOURNAL OF JAPAN SOC...arrow_drop_down
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    Authors: Peter C. Chu; Joseph M. Veneziano; Chenwu Fan; Michael J. Carron; +1 Authors

    A moving tropical cyclone is an intense localized source of surface wind stress and wind stress curl that produces a significant response in the ocean environment, especially in the ocean thermal structure, the upper ocean currents, and the sea surface elevation. Such a response has been well identified in the open‐ocean region, but not in the coastal ocean region. In this study we use the Princeton Ocean Model with 20 km horizontal resolution and 23 sigma levels conforming to a realistic bottom topography to identify the response of the South China Sea to Tropical Cyclone Ernie 1996. Results show strong similarities in the responses between open ocean and coastal regions, including near‐surface strong asymmetric response such as divergent currents with near‐inertial oscillations, significant sea surface temperature cooling, biase to the right of the storm track, sea surface depressions in the wake of the storm, and subsurface intense upwelling and cooling at the base of the mixed layer to the right of the storm track. The unique features of the SCS response to Ernie are also discussed.

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    Journal of Geophysical Research Atmospheres
    Article . 2000 . Peer-reviewed
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      Journal of Geophysical Research Atmospheres
      Article . 2000 . Peer-reviewed
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    Authors: R. N. Suleimanov; A. A. Chekalkin; V. V. Khronusov;

    The paper deals with the formation a mathematical modeling of heat transfer at the freezing well effect on the rock massif during the shaft deepening. The dynamics modeling of the temperature field around the shaft was made in the application package «ANSYS». The approximate formation time of the frozen rock massif of desired thickness, which is necessary for sinking the shaft, was determined.

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    Authors: Hideaki Fujita; Mitsugi Tan; Satoshi Ogasawara; Hirofumi Akagi;

    This paper points out that dc magnetic-flux deviation may occur in a doubly-fed flywheel genarator with primary-current feedback control. The flux deviation discussed in this paper, which is different from the common flux deviation caused by a dc output voltage of a PWM converter, is induced by an ac output voltage of the PWM inverter operated at the angular frequency of the rotor. It may be impossible to detect such a dc flux from the primary current and/or voltage, because the dc flux induces no voltage on the primary windings. This paper reveals that the primary-current control induces a dc flux in the primary windingsand prevents the dc flux from decaying. A new control method for suppressing the dc flux deviation, which is based on calculating the exciting current from the primary and secondary currents, is proposed. Experimental results verify the viability of the control method proposed in this paper.

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    IEEJ Transactions on Industry Applications
    Article . 2003 . Peer-reviewed
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      IEEJ Transactions on Industry Applications
      Article . 2003 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Richard C. Dugdale; Frances P. Wilkerson; Fei Chai; Richard A. Feely;

    The equatorial Pacific Ocean is the largest natural source of CO2 to the atmosphere, and it significantly impacts the global carbon cycle. Much of the large flux of upwelled CO2 to the atmosphere is due to incomplete use of the available nitrate (NO3) and low net productivity. This high‐nutrient low‐chlorophyll (HNLC) condition of the equatorial upwelling zone (EUZ) has been interpreted from modeling efforts to be due to low levels of silicate (Si(OH)4) that limit the new production of diatoms. These ideas were incorporated into an ecosystem model, CoSINE. This model predicted production by the larger phytoplankton and the picoplankton and effects on air‐sea CO2 fluxes in the Pacific Ocean. However, there were no size‐fractionated rates available for verification. Here we report the first size‐fractionated new and regenerated production rates (obtained with 15N−NO3 and 15N−NH4 incubations) for the EUZ with the objective of validating the conceptual basis and functioning of the CoSINE model. Specifically, the larger phytoplankton (with cell diameters > 5 μm) had greater rates of new production and higher f‐ratios (i.e., the proportion of NO3 to the sum of NO3 and NH4 uptake) than the picoplankton that had high rates of NH4 uptake and low f‐ratios. The way that the larger primary producers are regulated in the EUZ is discussed using a continuous chemostat approach. This combines control of Si(OH)4 production by supply rate (bottom‐up) and control of growth rate (or dilution) by grazing (top‐down control).

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    Global Biogeochemical Cycles
    Article . 2007 . Peer-reviewed
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      Global Biogeochemical Cycles
      Article . 2007 . Peer-reviewed
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    Authors: M.I. Orlyuk; A. A. Romenets;

    The geomagnetic field, along with other environmental factors, is a necessary component of life on the Earth. Currently, there are relevant ecological standards for the values of constant and variable fields. Taking them into account, it is possible to determine the conditions necessary for the normal functioning of biological objects in general and humans in particular. In a number of regulations, certain limit values for a constant magnetic field are introduced, as well as the maximum permissible time of a human being stay in such fields. In this regard, the article considers the spatiotemporal change in induction B on the Earth’s surface using the example of its main magnetic field according to the international model IGRF-13 for the time interval 1950—2020. In more detail for this time interval, the induction module B and its perturbation were analyzed for geomagnetically different regions that are, namely, the territories of Ukraine, of Yamal (Russia) and around the Ukrainian Antarctic Akademik Vernadsky station. For the planet in whole, a significant decrease in the geomagnetic field is shown, against the background of which its sharp jumps are observed (in 1960—1965, 1980—1985 and in 2000—2005), and after 2005 to the present, a deceleration in the decrease of the geomagnetic field is observed. Against the background of a decrease in the geomagnetic field of the planet, areas with extreme changes both in the direction of increase (Ukraine, Yamal) and decrease (AV station) are distinguished. The spatiotemporal changes in the geomagnetic field detected on the Earth’s surface determine the structure and dynamics of its magnetosphere, which by-turn affects the nature of the interaction with it of solar wind substance and of cosmic radiation, as well as the flow altitudes of magnetospheric and ionospheric currents. According to the distribution of the geomagnetic field anomalies on the surface of the planet, as well as to their changes over the studied time interval, regions with different (as compared with proposed ecological norms) values of the constant magnetic field and its disturbances are distinguished. In particular, for the epoch of 2020, for the territory in the vicinity of the AV station, the induction vector module B is on average 15,000 nT less than its value for the territory of Ukraine and 25,000 nT — of Yamal. Significant changes in the geomagnetic field were determined: an increase of 1765 nT for Ukraine, 1418 nT for Yamal and a decrease of — 7081 nT in the vicinity of AV station. At the same time, the perturbation of the geomagnetic field of the territory of Ukraine is within its ecological norm, deviates from it in the direction of increase on the Yamal Peninsula, and near the AV station it will soon go beyond its limits in the direction of decrease, while maintaining modern field changes.

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    Geofizicheskiy Zhurnal
    Article . 2020 . Peer-reviewed
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    Geofizicheskiy Zhurnal
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      Geofizicheskiy Zhurnal
      Article . 2020 . Peer-reviewed
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      Geofizicheskiy Zhurnal
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    Authors: I Grünberg; J Boike;
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    Authors: M. Mohammad Ali; Waseem Ahmad; maqsood ali malik; fahed ahmad; +1 Authors
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    Authors: Tom Dunkley Jones; Hayley Manners; Murray Hoggett; Sandra Kirtland Turner; +7 Authors

    Abstract. The response of the Earth System to greenhouse-gas driven warming is of critical importance for the future trajectory of our planetary environment. Hypethermal events – past climate transients with significant global-scale warming – can provide insights into the nature and magnitude of these responses. The largest hyperthermal of the Cenozoic was the Palaeocene-Eocene Thermal Maximum (PETM ~ 56 Ma). Here we present a new high-resolution cyclostratigraphy for the classic PETM section at Zumaia, Spain. With this new age model we are able to demonstrate that detrital sediment accumulation rates within this continental margin section increased more than four-fold during the PETM, representing a radical change in regional hydrology that drove dramatic increases in terrestrial to marine sediment flux. During the body of the PETM, orbital-scale variations in bulk sediment Si/Fe ratios are evidence for the continued orbital pacing of sediment erosion and transport processes, most likely linked to precession controls on sub-tropical hydroclimates. Most remarkable is that detrital accumulation rates remain high throughout the body of the PETM, and even reach peak values during the recovery phase of the characteristic PETM carbon isotope excursion (CIE). Using a series of Earth System Model inversions, we demonstrate that the silicate weathering feedback alone is insufficient to recover the PETM CIE, and that active organic carbon burial is required to match the observed dynamics of the CIE. Further, that the period of maximum organic carbon sequestration coincides with the peak in detrital accumulation rates observed at Zumaia. Based on these results, we hypothesize that precession controls on tropical and sub-tropical hydroclimates, and the sediment dynamics associated with this variation, play a significant role in the timing of the rapid climate and CIE recovery from peak-PETM conditions.

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    https://www.clim-past.net/14/1...
    Preprint
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    https://doi.org/10.5194/cp-201...
    Preprint . 2017
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      https://www.clim-past.net/14/1...
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      https://doi.org/10.5194/cp-201...
      Preprint . 2017
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    Authors: G. Wilson; J. Conrad; J. Anderson; A. Swidinsky; +2 Authors

    Abstract. Recent advancements and the widespread availability of low-cost microcontrollers and electronic components have created new opportunities for developing and using low-cost, open-source instrumentation for near-surface geophysical investigations. Geophysical methods that do not require ground contact, such as frequency-domain electromagnetics, allow one or two users to quickly acquire significant amounts of ground resistivity data in a cost-effective manner. The Colorado School of Mines electromagnetic system (CSM-EM) is a proof-of-concept instrument capable of sensing conductive objects in near-surface environments, and is similar in concept to commercial-grade equipment while costing under USD 400 to build. We tested the functionality of the CSM-EM system in a controlled laboratory setting during the design phase and validated it over a conductive target in an outdoor environment. The transmitter antenna can generate a current of over 2.5 A, and emit signals that are detectable by a receiver antenna at offsets of up to 25 m. The system requires minor refitting to change the functioning frequency, and has been operationally validated at 0.4 and 1.6 kHz. The receiver signal can be measured by off-the-shelf digital multimeters. Future directions will focus on improving the electronic and mechanical stability of the CSM-EM with the goal of using acquired data to make quantitative measurements of subsurface resistivity.

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    Other literature type . 2022
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    Geoscientific Instrumentation, Methods and Data Systems (GI)
    Article . 2022 . Peer-reviewed
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    https://doi.org/10.5194/egusph...
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    DOAJ
    Article . 2022
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      Geoscientific Instrumentation, Methods and Data Systems (GI)
      Article . 2022 . Peer-reviewed
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      https://doi.org/10.5194/egusph...
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    Authors: Yasuto Tachikawa; Michiharu Shiiba; Shinichi Harai; Takuma Takasao;

    合成開ロレーダ(SAR)によって取得される陸域の後方散乱係数には, 地表面の凹凸が影響する. この性質を利用して, 合成開ロレーダデータから空気力学的粗度の空間的分布図を作成することを試みる. 琵琶湖北東域において, JERS-1によるLバンドSAR画像, ERS-1によるCバンドSAR画像からそれぞれ粗度分布図を作成し, 国土数値情報の土地利用情報から作成した粗度分布図(Kondo&Yamazawa, 1986による手法)と比較した. その結果, JERS-1によるSAR画像から作成した分布図と国土数値情報から作成した分布図とは良い対応を示すことがわかった.

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    Authors: Peter C. Chu; Joseph M. Veneziano; Chenwu Fan; Michael J. Carron; +1 Authors

    A moving tropical cyclone is an intense localized source of surface wind stress and wind stress curl that produces a significant response in the ocean environment, especially in the ocean thermal structure, the upper ocean currents, and the sea surface elevation. Such a response has been well identified in the open‐ocean region, but not in the coastal ocean region. In this study we use the Princeton Ocean Model with 20 km horizontal resolution and 23 sigma levels conforming to a realistic bottom topography to identify the response of the South China Sea to Tropical Cyclone Ernie 1996. Results show strong similarities in the responses between open ocean and coastal regions, including near‐surface strong asymmetric response such as divergent currents with near‐inertial oscillations, significant sea surface temperature cooling, biase to the right of the storm track, sea surface depressions in the wake of the storm, and subsurface intense upwelling and cooling at the base of the mixed layer to the right of the storm track. The unique features of the SCS response to Ernie are also discussed.

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    Journal of Geophysical Research Atmospheres
    Article . 2000 . Peer-reviewed
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      Journal of Geophysical Research Atmospheres
      Article . 2000 . Peer-reviewed
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    Authors: R. N. Suleimanov; A. A. Chekalkin; V. V. Khronusov;

    The paper deals with the formation a mathematical modeling of heat transfer at the freezing well effect on the rock massif during the shaft deepening. The dynamics modeling of the temperature field around the shaft was made in the application package «ANSYS». The approximate formation time of the frozen rock massif of desired thickness, which is necessary for sinking the shaft, was determined.

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    Authors: Hideaki Fujita; Mitsugi Tan; Satoshi Ogasawara; Hirofumi Akagi;

    This paper points out that dc magnetic-flux deviation may occur in a doubly-fed flywheel genarator with primary-current feedback control. The flux deviation discussed in this paper, which is different from the common flux deviation caused by a dc output voltage of a PWM converter, is induced by an ac output voltage of the PWM inverter operated at the angular frequency of the rotor. It may be impossible to detect such a dc flux from the primary current and/or voltage, because the dc flux induces no voltage on the primary windings. This paper reveals that the primary-current control induces a dc flux in the primary windingsand prevents the dc flux from decaying. A new control method for suppressing the dc flux deviation, which is based on calculating the exciting current from the primary and secondary currents, is proposed. Experimental results verify the viability of the control method proposed in this paper.

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    IEEJ Transactions on Industry Applications
    Article . 2003 . Peer-reviewed
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      IEEJ Transactions on Industry Applications
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