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Iceland is an episodic source of atmospheric ice-nucleating particles relevant for mixed-phase clouds.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Sanchez-Marroquin, A  ORCID logo  https://orcid.org/0000-0003-4510-4551
Arnalds, O 
Baustian-Dorsi, KJ 
Browse, J 
Dagsson-Waldhauserova, P 

Abstract

Ice-nucleating particles (INPs) have the potential to remove much of the liquid water in climatically important mid- to high-latitude shallow supercooled clouds, markedly reducing their albedo. The INP sources at these latitudes are very poorly defined, but it is known that there are substantial dust sources across the high latitudes, such as Iceland. Here, we show that Icelandic dust emissions are sporadically an important source of INPs at mid to high latitudes by combining ice-nucleating active site density measurements of aircraft-collected Icelandic dust samples with a global aerosol model. Because Iceland is only one of many high-latitude dust sources, we anticipate that the combined effect of all these sources may strongly contribute to the INP population in the mid- and high-latitude northern hemisphere. This is important because these emissions are directly relevant for the cloud-phase climate feedback and because high-latitude dust emissions are expected to increase in a warmer climate.

Description

Keywords

37 Earth Sciences, 3701 Atmospheric Sciences, 13 Climate Action

Journal Title

Sci Adv

Conference Name

Journal ISSN

2375-2548
2375-2548

Volume Title

6

Publisher

American Association for the Advancement of Science (AAAS)