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Conference Paper

Black carbon scavenging in low-level Arctic clouds

Authors

Zieger,  Paul
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Heslin-Rees,  Dominic
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Karlsson,  Linn
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Koike,  Makoto
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Modini,  Robin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Krejci,  Radovan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Zieger, P., Heslin-Rees, D., Karlsson, L., Koike, M., Modini, R., Krejci, R. (2023): Black carbon scavenging in low-level Arctic clouds, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2384


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018395
Abstract
Black carbon (BC) from anthropogenic or natural sources can be transported to the Arctic, where it affects the surface radiation budget by scattering and absorbing solar radiation or by acting as cloud condensation nuclei. The extent to which BC is involved in Arctic cloud formation remains uncertain due to the lack of direct and long-term observations. Here, we present a 4-year study on observations of BC concentrations of aerosols and cloud residuals (i.e. dried cloud particles) using a counterflow virtual impactor inlet at Zeppelin Observatory, Svalbard. We will show that the scavenging of BC follows a clear seasonal cycle with almost complete scavenged fractions of BC in summer and smaller scavenged fractions in late winter and early fall during the Arctic haze period. The scavenged BC fractions were positively correlated with cloud water content and showed a dependence on air temperature most likely due to cloud-microphysical processes. A source analysis showed that clouds at the site are mainly of marine origin, in opposite to non-cloudy air, where anthropogenic BC sources over land are more dominant.