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688 research outcomes, page 1 of 69
  • publication . Article . Preprint . 2004
    Open Access English
    Authors:
    Markus Rapp; Franz-Josef Lübken;
    Publisher: HAL CCSD

    Abstract. Polar mesosphere summer echoes (PMSE) are very strong radar echoes primarily studied in the VHF wavelength range from altitudes close to the polar summer mesopause. Radar waves are scattered at irregularities in the radar refractive index which at mesopause al...

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  • publication . Other literature type . Article . 2021
    Open Access English
    Authors:
    Baseerat Romshoo; Thomas Müller; Sascha Pfeifer; Jorge Saturno; Andreas Nowak; Krzysztof Ciupek; Paul Quincey; Alfred Wiedensohler;
    Persistent Identifiers
    Publisher: Copernicus Publications

    The formation of black carbon fractal aggregates (BCFAs) from combustion and subsequent ageing involves several stages resulting in modifications of particle size, morphology, and composition over time. To understand and quantify how each of these modifications influenc...

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  • publication . Article . Preprint . 2016
    Open Access English
    Authors:
    D. O'Sullivan; B. J. Murray; J. F. Ross; J. F. Ross; M. E. Webb;
    Country: United Kingdom
    Project: EC | MarineIce (648661), UKRI | Atmospheric ice nuclei in... (NE/K004417/1), EC | ICE (240449), UKRI | Control of Crystal Nuclea... (EP/M003027/1)

    Abstract. The occurrence of ice-nucleating particles (INPs) in our atmosphere has a profound impact on the properties and lifetime of supercooled clouds. To date, the identities, sources and abundances of particles capable of nucleating ice at relatively low supercoolin...

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  • publication . Article . Other literature type . 2021
    Open Access English
    Authors:
    Ramon Campos Braga; Barbara Ervens; Daniel Rosenfeld; Meinrat O. Andreae; Jan-David Förster; Daniel Fütterer; Lianet Hernández Pardo; Bruna A. Holanda; Tina Jurkat-Witschas; Ovid O. Krüger; ...
    Persistent Identifiers
    Publisher: HAL CCSD
    Country: France

    Aerosol–cloud interactions contribute to the large uncertainties in current estimates of climate forcing. We investigated the effect of aerosol particles on cloud droplet formation by model calculations and aircraft measurements over the Amazon and over the western trop...

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  • publication . Article . Preprint . 2017
    Open Access
    Authors:
    Vered Silverman; Nili Harnik; Katja Matthes; Sandro W. Lubis; Sebastian Wahl;
    Publisher: Copernicus Publications (EGU)
    Country: Germany

    Abstract. The radiative effects induced by including interactive ozone, in particular, the zonally asymmetric part of the ozone field, have been shown to significantly change the temperature of the NH winter polar cap, and correspondingly the strength of the polar vorte...

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  • publication . Preprint . Article . 2018
    Open Access
    Authors:
    S. Bucci; S. Bucci; P. Cristofanelli; S. Decesari; A. Marinoni; S. Sandrini; J. Größ; A. Wiedensohler; C. F. Di Marco; E. Nemitz; ...
    Publisher: Copernicus GmbH
    Country: United Kingdom

    Abstract. Studying the vertical distribution of aerosol particle physical and chemical properties in the troposphere is essential to understand the relative importance of local emission processes vs. long-range transport for column-integrated aerosol properties (e.g. th...

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  • publication . Preprint . Article . 2017
    Open Access
    Authors:
    Sandro W. Lubis; Vered Silverman; Katja Matthes; Nili Harnik; Nour-Eddine Omrani; Sebastian Wahl;
    Persistent Identifiers
    Publisher: Copernicus Publications (EGU)
    Country: Germany

    It is well established that variable wintertime planetary wave forcing in the stratosphere controls the variability of Arctic stratospheric ozone through changes in the strength of the polar vortex and the residual circulation. While previous studies focused on the vari...

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  • publication . Preprint . Article . Other literature type . 2016
    Open Access
    Authors:
    K. Ignatius; T. B. Kristensen; E. Järvinen; L. Nichman; C. Fuchs; H. Gordon; P. Herenz; C. R. Hoyle; C. R. Hoyle; J. Duplissy; ...
    Countries: Germany, Finland, United States, Canada, United Kingdom
    Project: EC | QAPPA (335478), AKA | Secondary organic aerosol... (259005), SNSF | CLOUD (20FI20_159851), EC | CLOUD-TRAIN (316662), SNSF | Investigation of new part... (200020_152907)

    There are strong indications that particles containing secondary organic aerosol (SOA) exhibit amorphous solid or semi-solid phase states in the atmosphere. This may facilitate heterogeneous ice nucleation and thus influence cloud properties. However, experimental ice n...

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  • publication . Article . Other literature type . 2015
    Open Access
    Authors:
    Franchin, A.; Ehrhart, S.; Leppä, J.; Nieminen, T.; Gagné, S.; Schobesberger, S.; Wimmer, D.; Duplissy, J.; Riccobono, F.; Dunne, E. M.; ...
    Persistent Identifiers
    Publisher: Copernicus GmbH
    Countries: United Kingdom, United States, Finland, Austria
    Project: SNSF | Investigation of new part... (200020_152907), EC | CLOUD-ITN (215072), SNSF | CLOUD (20FI20_159851), SNSF | CLOUD (20FI20_149002), EC | CLOUD-TRAIN (316662)

    We present the results of laboratory measurements of the ion–ion recombination coefficient at different temperatures, relative humidities and concentrations of ozone and sulfur dioxide. The experiments were carried out using the Cosmics Leaving OUtdoor Droplets (CLOUD) ...

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  • publication . Article . Preprint . 2009
    Open Access
    Authors:
    Kruger, K.; Tegtmeier, S.; Markus Rex;
    Persistent Identifiers
    Publisher: Copernicus GmbH
    Country: Germany
    Project: EC | SHIVA (226224)

    Abstract. For the first time the long-term interannual and spatial variability of residence time (τ) is presented for the TTL between 360 K and 400 K theta (~14 to 18 km altitude). The analysis is based on a Lagrangian approach using offline calculated diabatic heating ...

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688 research outcomes, page 1 of 69