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Relationship between low-cloud presence and the amount of overlying aerosols
Stockholm University, Faculty of Science, Department of Meteorology .
Number of Authors: 3
2016 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 16, no 9, 5781-5792 p.Article in journal (Refereed) Published
Abstract [en]

Aerosols are often advected above cloud decks, and the amount of aerosols over cloud has been assumed to be similar to that at the same heights in nearby clear sky. In this assumption, cloud and aerosol above cloud-top height are considered randomly located with respect to each other. The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) data are analyzed here to investigate this assumption on global scales. The CALIPSO data reveal that the aerosol optical depth (AOD) above low cloud tends to be smaller than in nearby clear sky during the daytime, and the opposite is true during the nighttime. In particular, over oceanic regions with wide-spread low cloud, such as the tropical southeastern Atlantic Ocean and northeastern Pacific Ocean, the daytime AOD above low cloud is often 40aEuro-% smaller than in surrounding clear skies.

Place, publisher, year, edition, pages
2016. Vol. 16, no 9, 5781-5792 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-132022DOI: 10.5194/acp-16-5781-2016ISI: 000376938100018OAI: oai:DiVA.org:su-132022DiVA: diva2:951590
Available from: 2016-08-09 Created: 2016-07-05 Last updated: 2016-08-09Bibliographically approved

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Lewinschal, Anna
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