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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: Tangunan, Deborah N; Berke, Melissa A; Cartagena-Sierra, Alejandra; Flores, José Abel; +11 Authors

    In the southern Indian Ocean, the position of the subtropical front – the boundary between colder, fresher waters to the south and warmer, saltier waters to the north – has a strong influence on the upper ocean hydrodynamics and biogeochemistry. Here we analyse a sedimentary record from the Agulhas Plateau, located close to the modern position of the subtropical front and use alkenones and coccolith assemblages to reconstruct oceanographic conditions over the past 300,000 years. We identify a strong glacial-interglacial variability in sea surface temperature and productivity associated with subtropical front migration over the Agulhas Plateau, as well as shorter-term high frequency variability aligned with variations in high latitude insolation. Alkenone and coccolith abundances, in combination with diatom and organic carbon records indicate high glacial export productivity. We conclude that the biological pump was more efficient and strengthened during glacial periods, which could partly account for the reported reduction in atmospheric carbon dioxide concentrations.

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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/
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    Authors: Martinez, Andres; Awad, Andrew M; Hornbuckle, Keri C;

    We report the levels of airborne individual PCB concentrations of gas and particle phases from the City of Chicago in 2009. Twenty-seven and 17 locations were sampled for gas and particle phases, respectively, where 141 and 46 gas and particle phases were collected. Total suspended particles (TSP) were also measured for the particle-phase samples. One hundred and seventy-one individual or coeluting congener PCBs are reported. Field blank masses for all 171 individual congeners for both gas (XAD-2) and particle (QFF) phases are included. Sample mass for all 171 individual congeners for both gas (XAD-2) and particle (QFF) phases are included. Deployment time and sampling flow are included. Final individual PCB congener concentrations, as well as ambient air temperature (K), wind speed (m/s), and TSP are included.

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    Authors: Van Audenhaege, Loïc; Broad, Emmeline; Hendry, Katharine R; Huvenne, Veerle A I;

    We used a multibeam echosounder (Reson7125) front-mounted onto the ROV Isis (Dive D333, DY081 expedition) to map the terrain of a vertical feature marking the edge of a deep-sea glacial trough (Labrador Sea, [63°51.9'N, 53°16.9'W, depth: 650 to 800 m]). After correction of the ROV navigation (i.e. merging of USBL and DVL), bathymetry [m] and backscatter [nominal unit] were extracted at a resolution of 0.3 m and different terrain descriptors were computed: Slope, Bathymetric Position Index (BPI), Terrain Ruggedness Index, Roughness, Mean and Gaussian curvatures and orientations (Northness and Eastness), at scales of 0.9, 3 and 9 m. Using a Principal Component Analysis (PCA), the terrain descriptors enabled to retrieve 4 terrain clusters and their associated confusion index, to investigate the spatial heterogeneity of the terrain. This approach also underlined the presence of geomorphic features in the wall terrain. The extraction of the backscatter intensity for the first time considering vertical terrains, opens space for further acquisition and processing development. Using photographs collected by the ROV Isis (Dive D334, DY081 expedition), epibenthic fauna was annotated. Each image was linked to a terrain cluster in the 3D space and pooled into 20-m² bins of images. A Bray-Curtis dissimilarity matrix was constructed from morphospecies abundances. This enabled to test for differences of assemblage composition among clusters. Few species appeared more abundant in particular clusters such as L. pertusa in high-roughness cluster. However, nMDS suggested differences in assemblage composition but these dissimilarities were not strongly delineated. Whereas the design of this study may have limited distinctive differences among assemblages, this shows the potential of this cost-effective method of top-down habitat mapping to be applied in undersampled benthic habitat in order to provide a priori knwoledge for defining appropriate sampling design.

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    Authors: Iyer, Ram Balam;

    Time and energy are finite resources in any environment, and how and when organisms use their available resources to survive and reproduce is the crux of life history theory (Gadgil and Bossert 1970; Balon 1975; Stearns 1976). The different survival strategies used by animals are often shaped by their environment in addition to their biology (Winemiller and Rose 1992), which allows for exploration into biological variability when environmental factors are known. For this reason, the Line Islands in the Central Pacific provide an ideal location to perform observational studies due to their unique productivity gradient and fish assemblage structures across the island chain (Sandin et al. 2008; DeMartini et al. 2008; Fox et al. 2018; Zgliczynski et al. 2019). Many of the world’s coral reefs are in remote regions that lack monitoring programs or even local populations, so conducting ecological surveys on fish communities in these regions can require extensive amounts of time, energy, resources and people. The inherent variability an environment exerts on the many factors that contribute to growth over a lifetime make it difficult to generate a directly proportional formula that calculates age. A novel age estimation method was developed that utilizes in-situ visual census data to estimate the age of fishes, and as a case study, several fish were chosen as representative species to explore its capabilities. Through this process, new ecological information and insight can be gained about the age structures of fish populations both between and throughout the Line Islands.

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    Authors: Alexander, Kelsey Leigh;

    The natural world is an extraordinary source of diverse organisms and natural product compounds. The use of natural products and their derivatives has been a recurring theme in the discovery and development of new therapeutics. The marine world is vast and contains incredible biological and chemical diversity. Therefore, the oceans have the potential for new discoveries of compounds with medicinal applications. One group of marine organism that has been shown to be a prolific producer of bioactive compounds is the cyanobacteria. This work focuses on the study of new compounds from marine cyanobacteria for their chemical diversity and biological activity. The work in this dissertation focuses on the discovery and characterization of compounds from two different species of cyanobacteria, Leptolyngbya sp. and Moorena producens. These were collected from American Samoa and Puerto Rico, respectively. The characterization of these compounds was achieved through the integration of a variety of techniques including mass spectrometry, advanced NMR technology and genomic information. This analysis led to the characterization of a new ionophore from the Leptolygbya sp. The collection of Moorena producens afforded new analogues of the bioactive compound, curacin A. 2D NMR was an essential aspect in these studies. Therefore, the optimization of different NMR techniques for faster data acquisition was studied in this dissertation for its applications on lower concentrations of natural products. This work highlights the novelty of compounds that can be discovered by the application of the multiple techniques. Additionally, it demonstrates the reduction in time that is possible with new techniques for the experimental acquisition of NMR data. Finally, this dissertation adds to the body of knowledge of the chemistry that originates from the world’s oceans.

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    Authors: Gottschalk, Julia; Skinner, Luke C; Jaccard, Samuel L; Waelbroeck, Claire;

    Past millennial-scale changes in atmospheric CO2 (CO2,atm) levels have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. There remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to distinct abrupt climate variability in the northern hemi-sphere that involve perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the extent and sensitivity of the AMOC to changes, and therefore provide an opportunity to study their role in marine carbon cycling. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC 'geometry' (via carbonate ion saturation) in the deep South Atlantic during the past two glacial periods. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial periods. These findings suggest a consistent pat-tern of increased Southern Ocean convection and/or air-sea CO2 fluxes during northern-hemisphere stadials accompanying AMOC perturbations and promoting a rise in CO2,atm levels, despite potential differences in the magnitude of the forcing, the climate (and hence, AMOC) background conditions and the rate of ocean-atmospheric CO2 fluxes. We find that net ocean car-bon loss, and hence the magnitude of CO2,atm rise, during a glacial is largely determined by the stadial duration. North Atlantic climate anomalies may therefore significantly affect Southern Ocean carbon cycling through oceanic (e.g., 'ventilation' seesaw) and/or atmospheric processes (e.g., Ekman pumping).

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    Authors: Smith, Craig R.; Tunnicliffe, Verena; Colaco, Ana; Drazen, Jeffrey C.; +9 Authors

    Gordon & Betty Moore FoundationGordon and Betty Moore Foundation [5596]; Canada Research Chairs FoundationCanada Research Chairs; European Union's Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant [747946]; Fundacao para a Ciencia e Tecnologia I.P. Portugal (FCT); Direcao-Geral de Politica do Mar (DGPM) [2/2017/001-MiningImpact 2]; FCTPortuguese Foundation for Science and TechnologyEuropean Commission [CEECIND005262017, UID/MAR/00350/2013, IF/01194/2013, IF/00029/2014/CP1230/CT0002, Mining2/0005/2017]; RF State Assignment [0149-2019-0009]; Horizon 2020 Agricultural Interoperability and Analysis System (ATLAS) projects [678760]; JM Kaplan Fund; National Science FoundationNational Science Foundation (NSF) [OCE 1634172]; JPI Oceans project Mining Impact -Environmental Impacts and Risks of Deep-Sea Mining Aug 2018-Feb 2022 (NWO-ALW) [856.18.001] info:eu-repo/semantics/publishedVersion

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    Authors: Drury, Anna Joy; Liebrand, Diederik; Westerhold, Thomas; Beddow, Helen M; +8 Authors

    These are the supplementary datasets for the manuscript: Drury, A.J., Liebrand, D., Westerhold, T., Beddow, H., Hodell, D., Rohlfs, N., Wilkens, R.H., Lourens, L., 'History of South Atlantic carbonate deposition since the Oligocene (30-0 Ma)', in final preparation for submission Climate of the Past

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    https://doi.org/10.1594/pangae...
    Collection . 2020
    License: CC BY
    Data sources: Sygma
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      https://doi.org/10.1594/pangae...
      Collection . 2020
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    Authors: Onodera, Jonaotaro; Kemp, Alan E S; Pearce, Richard B; Horikawa, Keiji; +1 Authors

    The laminated sediments estimated as a varve were obtained on the Bowers Ridge in the Bering Sea by Integrated Ocean Drilling Program (IODP) Expedition 323 in 2009. The name and the estimated geological ages of the studied sediment cores are Cores IODP Expedition 323-U1340A-10H and 14H, and ~528 ka and ~782 ka, respectively. This dataset contains the thickness of laminated sediments, the micropaleontological count data on diatom fossils, and the composition of rare earth elements in the laminated sediment facies in the studied sediment cores. There are two different data on the micropaleontological diatom counts; one is the count results of diatom fragments in the back-scattered electron images of thin sections for the studied laminated sediments, and another is the count results of diatom valves remaining at least half of the intact shape encountered in the microscopic observation of smear slides for some subsamples from the laminated sediments.

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    Authors: Love, Connor;

    The creation, movement, and consumption of distinct biomolecules by marine organisms has far reaching implications regarding ecosystem material and energy flow and how we manage the marine environment. Lipids are ubiquitous, energy rich biomolecules that are essential for all life and are used for cell membrane structure, energy storage and serve as useful indicators for ecosystem and food web dynamics. In this dissertation, the flow of specific lipid biomolecules through multiple marine environments is measured, explored, and clarified to better understand biogeochemical cycles, marine food webs and ecosystem connectivity. In the first chapter of my dissertation, I measure, quantify, and close the loop of the open ocean microbial hydrocarbon cycle, with implications for priming effects of the ocean microbiome to oil spills. It is estimated that seeps, spills, and other oil pollution introduce ~ 1.3 million tons (1.3 Tg) of hydrocarbons into the ocean each year. Additionally, it is known that globally abundant marine cyanobacteria Prochlorococcus and Synechococcus which account for ~25% of ocean net primary production also produce hydrocarbons from fatty acids. But little is known about the size, turnover and fate of these cyanobacterial hydrocarbons and the implications for the ocean’s microbiome response to future oil spills. From a research expedition in the North Atlantic, I report that cyanobacteria in an oligotrophic gyre mainly produce n-pentadecane which correlates tightly with fluorescence and Prochlorococcus abundance in oligotrophic waters. Using chemical and isotopic tracing I find that pentadecane production and diel dynamics mainly occurs in the lower euphotic zone at the deep chlorophyll maximum. I estimate the global flux of cyanobacteria-produced pentadecane exceeds total oil input in the ocean by 100 to 500-fold, with cyanobacteria producing ~ 130-650 million tons of pentadecane per year. Analysis of sinking particles at the base of the euphotic zone show that nearly all pentadecane (< 0.001 % remaining) is consumed within the euphotic zone, suggesting near complete consumption of these hydrocarbons by hydrocarbon degrading microbes. These findings characterize a wide-spread microbial hydrocarbon cycle that selectively primes the ocean’s microbiome with long-chain alkanes. In the second chapter of my dissertation, I conduct a large-scale feeding experiment on a symbiotic reef-building coral (Stylophora pistillata) in the Red Sea to clarify fatty acid and isotopic biomarker patterns of coral heterotrophy for use in the field. Coral heterotrophy is an often-overlooked facet of coral nutrition that provides essential nutrients that help corals resist and recover from thermally induced bleaching that is degrading reef ecosystems around the world due to rising global ocean temperatures. Yet, methods for measuring coral mixotrophy, the balance between organic matter contributions to the coral host from autotrophic photo endosymbionts and heterotrophy on particles and plankton have typically been too coarse to elucidate source contributions. Through my experiment I show that fatty acids and isotopic biomarkers reliably separate experimental and reef nutritional source groups (heterotrophic or autotrophic). I show that heterotrophic fatty acid biomarkers are reliably recorded into coral host and symbiont tissues, with a divergent metabolic pattern of autotrophic biomarkers as feeding increases due to positive feedback of heterotrophy on the in hospite photo symbiont population. Additionally, I show that nitrogen and essential fatty acids are preferentially recorded into coral tissue while most heterotrophic carbon is respired or exuded as mucous; this shows that the use of bulk carbon isotopes as a feeding proxy for the last ~ 40 years is largely underestimating the contribution of heterotrophy to the trophic ecology of reef building corals. Overall, this finding underscores a connectivity between oceanic phyto- and zooplankton and reef-building coral. In the third chapter of my dissertation, I explore the mixotrophic differences of divergent bleaching responses of Acropora hyacinthus colonies on the forereef of Mo’orea during the 2019 mass bleaching event. During this bleaching event, all colonies of A. hyacinthus on the deep forereef (14 m) bleached and recovered, while colonies on the shallow forereef (5 m) near the reef crest resisted bleaching entirely, despite the same temperature stress. Using fatty acid and isotopic biomarkers I show through several lines of evidence that bleaching resistant colonies near the reef crest were likely consuming more particulate organic matter than deep forereef colonies. This conclusion is supported by isotopic feeding proxies, less isotopic niche overlap of the host and symbiont of resistant colonies, and larger proportions of putative POM fatty acid biomarkers in the host of resistant colonies relative to recovered colonies. This interpretation is in line with observations that benthic communities on the reef crest are a net sink of oceanic POM and that increased reliance on heterotrophy is associated with bleaching resistance. These data show the vital importance of reef environment, coral heterotrophy, and planktonic subsidies in structuring bleaching response of corals in a warming ocean and ultimately show that the reef crest may serve as a potent zone for reseeding coral populations after marine heat waves.

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    Authors: Tangunan, Deborah N; Berke, Melissa A; Cartagena-Sierra, Alejandra; Flores, José Abel; +11 Authors

    In the southern Indian Ocean, the position of the subtropical front – the boundary between colder, fresher waters to the south and warmer, saltier waters to the north – has a strong influence on the upper ocean hydrodynamics and biogeochemistry. Here we analyse a sedimentary record from the Agulhas Plateau, located close to the modern position of the subtropical front and use alkenones and coccolith assemblages to reconstruct oceanographic conditions over the past 300,000 years. We identify a strong glacial-interglacial variability in sea surface temperature and productivity associated with subtropical front migration over the Agulhas Plateau, as well as shorter-term high frequency variability aligned with variations in high latitude insolation. Alkenone and coccolith abundances, in combination with diatom and organic carbon records indicate high glacial export productivity. We conclude that the biological pump was more efficient and strengthened during glacial periods, which could partly account for the reported reduction in atmospheric carbon dioxide concentrations.

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    Authors: Martinez, Andres; Awad, Andrew M; Hornbuckle, Keri C;

    We report the levels of airborne individual PCB concentrations of gas and particle phases from the City of Chicago in 2009. Twenty-seven and 17 locations were sampled for gas and particle phases, respectively, where 141 and 46 gas and particle phases were collected. Total suspended particles (TSP) were also measured for the particle-phase samples. One hundred and seventy-one individual or coeluting congener PCBs are reported. Field blank masses for all 171 individual congeners for both gas (XAD-2) and particle (QFF) phases are included. Sample mass for all 171 individual congeners for both gas (XAD-2) and particle (QFF) phases are included. Deployment time and sampling flow are included. Final individual PCB congener concentrations, as well as ambient air temperature (K), wind speed (m/s), and TSP are included.

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    Authors: Van Audenhaege, Loïc; Broad, Emmeline; Hendry, Katharine R; Huvenne, Veerle A I;

    We used a multibeam echosounder (Reson7125) front-mounted onto the ROV Isis (Dive D333, DY081 expedition) to map the terrain of a vertical feature marking the edge of a deep-sea glacial trough (Labrador Sea, [63°51.9'N, 53°16.9'W, depth: 650 to 800 m]). After correction of the ROV navigation (i.e. merging of USBL and DVL), bathymetry [m] and backscatter [nominal unit] were extracted at a resolution of 0.3 m and different terrain descriptors were computed: Slope, Bathymetric Position Index (BPI), Terrain Ruggedness Index, Roughness, Mean and Gaussian curvatures and orientations (Northness and Eastness), at scales of 0.9, 3 and 9 m. Using a Principal Component Analysis (PCA), the terrain descriptors enabled to retrieve 4 terrain clusters and their associated confusion index, to investigate the spatial heterogeneity of the terrain. This approach also underlined the presence of geomorphic features in the wall terrain. The extraction of the backscatter intensity for the first time considering vertical terrains, opens space for further acquisition and processing development. Using photographs collected by the ROV Isis (Dive D334, DY081 expedition), epibenthic fauna was annotated. Each image was linked to a terrain cluster in the 3D space and pooled into 20-m² bins of images. A Bray-Curtis dissimilarity matrix was constructed from morphospecies abundances. This enabled to test for differences of assemblage composition among clusters. Few species appeared more abundant in particular clusters such as L. pertusa in high-roughness cluster. However, nMDS suggested differences in assemblage composition but these dissimilarities were not strongly delineated. Whereas the design of this study may have limited distinctive differences among assemblages, this shows the potential of this cost-effective method of top-down habitat mapping to be applied in undersampled benthic habitat in order to provide a priori knwoledge for defining appropriate sampling design.

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    Authors: Iyer, Ram Balam;

    Time and energy are finite resources in any environment, and how and when organisms use their available resources to survive and reproduce is the crux of life history theory (Gadgil and Bossert 1970; Balon 1975; Stearns 1976). The different survival strategies used by animals are often shaped by their environment in addition to their biology (Winemiller and Rose 1992), which allows for exploration into biological variability when environmental factors are known. For this reason, the Line Islands in the Central Pacific provide an ideal location to perform observational studies due to their unique productivity gradient and fish assemblage structures across the island chain (Sandin et al. 2008; DeMartini et al. 2008; Fox et al. 2018; Zgliczynski et al. 2019). Many of the world’s coral reefs are in remote regions that lack monitoring programs or even local populations, so conducting ecological surveys on fish communities in these regions can require extensive amounts of time, energy, resources and people. The inherent variability an environment exerts on the many factors that contribute to growth over a lifetime make it difficult to generate a directly proportional formula that calculates age. A novel age estimation method was developed that utilizes in-situ visual census data to estimate the age of fishes, and as a case study, several fish were chosen as representative species to explore its capabilities. Through this process, new ecological information and insight can be gained about the age structures of fish populations both between and throughout the Line Islands.

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    Authors: Alexander, Kelsey Leigh;

    The natural world is an extraordinary source of diverse organisms and natural product compounds. The use of natural products and their derivatives has been a recurring theme in the discovery and development of new therapeutics. The marine world is vast and contains incredible biological and chemical diversity. Therefore, the oceans have the potential for new discoveries of compounds with medicinal applications. One group of marine organism that has been shown to be a prolific producer of bioactive compounds is the cyanobacteria. This work focuses on the study of new compounds from marine cyanobacteria for their chemical diversity and biological activity. The work in this dissertation focuses on the discovery and characterization of compounds from two different species of cyanobacteria, Leptolyngbya sp. and Moorena producens. These were collected from American Samoa and Puerto Rico, respectively. The characterization of these compounds was achieved through the integration of a variety of techniques including mass spectrometry, advanced NMR technology and genomic information. This analysis led to the characterization of a new ionophore from the Leptolygbya sp. The collection of Moorena producens afforded new analogues of the bioactive compound, curacin A. 2D NMR was an essential aspect in these studies. Therefore, the optimization of different NMR techniques for faster data acquisition was studied in this dissertation for its applications on lower concentrations of natural products. This work highlights the novelty of compounds that can be discovered by the application of the multiple techniques. Additionally, it demonstrates the reduction in time that is possible with new techniques for the experimental acquisition of NMR data. Finally, this dissertation adds to the body of knowledge of the chemistry that originates from the world’s oceans.

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    Authors: Gottschalk, Julia; Skinner, Luke C; Jaccard, Samuel L; Waelbroeck, Claire;

    Past millennial-scale changes in atmospheric CO2 (CO2,atm) levels have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. There remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to distinct abrupt climate variability in the northern hemi-sphere that involve perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the extent and sensitivity of the AMOC to changes, and therefore provide an opportunity to study their role in marine carbon cycling. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC 'geometry' (via carbonate ion saturation) in the deep South Atlantic during the past two glacial periods. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial periods. These findings suggest a consistent pat-tern of increased Southern Ocean convection and/or air-sea CO2 fluxes during northern-hemisphere stadials accompanying AMOC perturbations and promoting a rise in CO2,atm levels, despite potential differences in the magnitude of the forcing, the climate (and hence, AMOC) background conditions and the rate of ocean-atmospheric CO2 fluxes. We find that net ocean car-bon loss, and hence the magnitude of CO2,atm rise, during a glacial is largely determined by the stadial duration. North Atlantic climate anomalies may therefore significantly affect Southern Ocean carbon cycling through oceanic (e.g., 'ventilation' seesaw) and/or atmospheric processes (e.g., Ekman pumping).

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    Authors: Smith, Craig R.; Tunnicliffe, Verena; Colaco, Ana; Drazen, Jeffrey C.; +9 Authors

    Gordon & Betty Moore FoundationGordon and Betty Moore Foundation [5596]; Canada Research Chairs FoundationCanada Research Chairs; European Union's Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant [747946]; Fundacao para a Ciencia e Tecnologia I.P. Portugal (FCT); Direcao-Geral de Politica do Mar (DGPM) [2/2017/001-MiningImpact 2]; FCTPortuguese Foundation for Science and TechnologyEuropean Commission [CEECIND005262017, UID/MAR/00350/2013, IF/01194/2013, IF/00029/2014/CP1230/CT0002, Mining2/0005/2017]; RF State Assignment [0149-2019-0009]; Horizon 2020 Agricultural Interoperability and Analysis System (ATLAS) projects [678760]; JM Kaplan Fund; National Science FoundationNational Science Foundation (NSF) [OCE 1634172]; JPI Oceans project Mining Impact -Environmental Impacts and Risks of Deep-Sea Mining Aug 2018-Feb 2022 (NWO-ALW) [856.18.001] info:eu-repo/semantics/publishedVersion

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    Authors: Drury, Anna Joy; Liebrand, Diederik; Westerhold, Thomas; Beddow, Helen M; +8 Authors

    These are the supplementary datasets for the manuscript: Drury, A.J., Liebrand, D., Westerhold, T., Beddow, H., Hodell, D., Rohlfs, N., Wilkens, R.H., Lourens, L., 'History of South Atlantic carbonate deposition since the Oligocene (30-0 Ma)', in final preparation for submission Climate of the Past

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    https://doi.org/10.1594/pangae...
    Collection . 2020
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      https://doi.org/10.1594/pangae...
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    Authors: Onodera, Jonaotaro; Kemp, Alan E S; Pearce, Richard B; Horikawa, Keiji; +1 Authors

    The laminated sediments estimated as a varve were obtained on the Bowers Ridge in the Bering Sea by Integrated Ocean Drilling Program (IODP) Expedition 323 in 2009. The name and the estimated geological ages of the studied sediment cores are Cores IODP Expedition 323-U1340A-10H and 14H, and ~528 ka and ~782 ka, respectively. This dataset contains the thickness of laminated sediments, the micropaleontological count data on diatom fossils, and the composition of rare earth elements in the laminated sediment facies in the studied sediment cores. There are two different data on the micropaleontological diatom counts; one is the count results of diatom fragments in the back-scattered electron images of thin sections for the studied laminated sediments, and another is the count results of diatom valves remaining at least half of the intact shape encountered in the microscopic observation of smear slides for some subsamples from the laminated sediments.

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