首页|Physical and Chemical Properties of Cloud Droplet Residuals and Aerosol Particles During the Arctic Ocean 2018 Expedition

Physical and Chemical Properties of Cloud Droplet Residuals and Aerosol Particles During the Arctic Ocean 2018 Expedition

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  • NSTL
  • Amer Geophysical Union
Detailed knowledge of the physical and chemical properties and sources of particles that form clouds is especially important in pristine areas like the Arctic, where particle concentrations are often low and observations are sparse. Here, we present in situ cloud and aerosol measurements from the central Arctic Ocean in August–September 2018 combined with air parcel source analysis. We provide direct experimental evidence that Aitken mode particles (particles with diameters ?70 nm) significantly contribute to cloud condensation nuclei (CCN) or cloud droplet residuals, especially after the freeze-up of the sea ice in the transition toward fall. These Aitken mode particles were associated with air that spent more time over the pack ice, while size distributions dominated by accumulation mode particles (particles with diameters ?70 nm) showed a stronger contribution of oceanic air and slightly different source regions. This was accompanied by changes in the average chemical composition of the accumulation mode aerosol with an increased relative contribution of organic material toward fall. Addition of aerosol mass due to aqueous-phase chemistry during in-cloud processing was probably small over the pack ice given the fact that we observed very similar particle size distributions in both the whole-air and cloud droplet residual data. These aerosol– cloud interaction observations provide valuable insight into the origin and physical and chemical properties of CCN over the pristine central Arctic Ocean.

Cloud Droplet ResidualsAerosol Particles DuringArctic Ocean

Linn Karlsson、Andrea Baccarini、Patrick Duplessis、Darrel Baumgardner、Ian M. Brooks、Rachel Y.-W. Chang、Lubna Dada、Kaspar R. D?llenbach、Liine Heikkinen、Radovan Krejci、W. Richard Leaitch、Caroline Leck、Daniel G. Partridge、Matthew E. Salter、Heini Wernli、Michael J. Wheeler、Julia Schmale、Paul Zieger

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Department of Environmental Science, Stockholm University, Stockholm, Sweden

Extreme Environments Research Laboratory, école Polytechnique fédérale de Lausanne, Sion, Switzerland

Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada

Droplet Measurement Technologies, LLC, Boulder, CO, USA

Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK

Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland

Climate Research Division, Environment and Climate Change Canada, Toronto, ON, Canada

Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden

College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK

Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland

Air Quality Research Division, Environment and Climate Change Canada, Toronto, ON, Canada

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2022

10.1029/2021JD036383

Journal of Geophysical Research

Journal of Geophysical Research

ISSN：2169-897X
年,卷(期)：2022.127(11)
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