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Atmospheric conditions during the Arctic Clouds in Summer Experiment (ACSE): Contrasting open-water and sea-ice surfaces during melt and freeze-up seasons
Stockholms universitet, Meteorologiska institutionen (MISU).
Stockholms universitet, Meteorologiska institutionen (MISU).
Stockholms universitet, Meteorologiska institutionen (MISU).
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2016 (English)In: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442Article in journal (Refereed) Epub ahead of print
Abstract [en]

The Arctic Clouds in Summer Experiment (ACSE) was conducted during summer and early autumn 2014, providing a detailed view of the seasonal transition from ice melt into freeze-up. Measurements were taken over both ice-free and ice-covered surfaces, near the ice edge, offering insight to the role of the surface state in shaping the atmospheric conditions. The initiation of the autumn freeze-up was related to a change in air mass, rather than to changes in solar radiation alone; the lower atmosphere cooled abruptly leading to a surface heat loss. During melt season, strong surface inversions persisted over the ice, while elevated inversions were more frequent over open water. These differences disappeared during autumn freeze-up, when elevated inversions persisted over both ice-free and ice-covered conditions. These results are in contrast to previous studies that found a well-mixed boundary layer persisting in summer and an increased frequency of surface-based inversions in autumn, suggesting that our knowledge derived from measurements taken within the pan-Arctic area and on the central ice-pack does not necessarily apply closer to the ice-edge. This study offers an insight to the atmospheric processes that occur during a crucial period of the year; understanding and accurately modeling these processes is essential for the improvement of ice-extent predictions and future Arctic climate projections.

Place, publisher, year, edition, pages
2016.
National Category
Earth and Related Environmental Sciences
Research subject
SWEDARCTIC 2014, SWERUS-C3
Identifiers
URN: urn:nbn:se:polar:diva-3301DOI: 10.1175/JCLI-D-16-0211.1OAI: oai:DiVA.org:polar-3301DiVA: diva2:1052943
Available from: 2016-10-05 Created: 2016-12-07 Last updated: 2016-12-07

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