References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-1205-2014

On the relationship between Arctic ice clouds and polluted air masses over the North Slope of Alaska in April 2008

Jouan

¹ ² Pelon

² Girard

¹ Ancellet

https://orcid.org/0000-0002-1542-6085

² Blanchet

J. P.

https://orcid.org/0000-0001-8591-2188

¹ Delanoë

Centre ESCER, Department of Earth and Atmospheric Sciences, University of Quebec At Montreal, H3C 3P8, Montreal, Quebec, Canada

Laboratoire Atmosphère, Milieux et Observations Spatiales, UPMC, UMR8190, 75252, Paris, France

Laboratoire Atmosphère, Milieux et Observations Spatiales, UVSQ, 78035, Guyancourt, France

03 02 2014

14 3 1205 1224

2014

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/14/1205/2014/acp-14-1205-2014.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/1205/2014/acp-14-1205-2014.pdf

Recently, two types of ice clouds (TICs) properties have been characterized using the Indirect and Semi-Direct Aerosol Campaign (ISDAC) airborne measurements (Alaska, April 2008). TIC-2B were characterized by fewer (< 10 L−1) and larger (> 110 μm) ice crystals, and a larger ice supersaturation (> 15%) compared to TIC-1/2A. It has been hypothesized that emissions of SO2 may reduce the ice nucleating properties of ice nuclei (IN) through acidification, resulting in a smaller concentration of larger ice crystals and leading to precipitation (e.g., cloud regime TIC-2B). Here, the origin of air masses forming the ISDAC TIC-1/2A (1 April 2008) and TIC-2B (15 April 2008) is investigated using trajectory tools and satellite data. Results show that the synoptic conditions favor air masses transport from three potential SO2 emission sources into Alaska: eastern China and Siberia where anthropogenic and biomass burning emissions, respectively, are produced, and the volcanic region of the Kamchatka/Aleutians. Weather conditions allow the accumulation of pollutants from eastern China and Siberia over Alaska, most probably with the contribution of acidic volcanic aerosol during the TIC-2B period. Observation Monitoring Instrument (OMI) satellite observations reveal that SO2 concentrations in air masses forming the TIC-2B were larger than in air masses forming the TIC-1/2A. Airborne measurements show high acidity near the TIC-2B flight where humidity was low. These results support the hypothesis that acidic coating on IN could be at the origin of the formation of TIC-2B.

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