期刊
JOURNAL OF CLIMATE
卷 29, 期 24, 页码 8721-8744出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JCLI-D-16-0211.1
关键词
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资金
- Knut and Alice Wallenberg Foundation [2011.2007]
- Swedish Research Council [2013-5334, 2012-5098]
- Faculty of Science at Stockholm University
- U.S. Office of Naval Research [N000141210235]
- U.K. Natural Environment Research Council [NE/K011820/1]
- NERC [NE/K011820/1] Funding Source: UKRI
- Natural Environment Research Council [ncas10009, NE/K011820/1] Funding Source: researchfish
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 into 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 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 into 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.
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