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  Melt onset over Arctic sea ice controlled by atmospheric moisture transport

Mortin, J., Svensson, G., Graversen, R., Kapsch, M.-L., Stroeve, J., & Boisvert, L. (2016). Melt onset over Arctic sea ice controlled by atmospheric moisture transport. Geophysical Research Letters, 43, 6636-6642. doi:10.1002/2016GL069330.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002B-0942-0 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-E4E0-4
Genre: Journal Article

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Mortin, J., Author
Svensson, G., Author
Graversen, R.G., Author
Kapsch, Marie-Louise1, Author
Stroeve, J.C., Author
Boisvert, L.N., Author
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1Ocean Physics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913557              

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 Abstract: The timing of melt onset affects the surface energy uptake throughout the melt season. Yet the processes triggering melt and causing its large interannual variability are not well understood. Here we show that melt onset over Arctic sea ice is initiated by positive anomalies of water vapor, clouds, and air temperatures that increase the downwelling longwave radiation (LWD) to the surface. The earlier melt onset occurs; the stronger are these anomalies. Downwelling shortwave radiation (SWD) is smaller than usual at melt onset, indicating that melt is not triggered by SWD. When melt occurs early, an anomalously opaque atmosphere with positive LWD anomalies preconditions the surface for weeks preceding melt. In contrast, when melt begins late, clearer than usual conditions are evident prior to melt. Hence, atmospheric processes are imperative for melt onset. It is also found that spring LWD increased during recent decades, consistent with trends toward an earlier melt onset. ©2016. American Geophysical Union. All Rights Reserved.

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Language(s): eng - English
 Dates: 2016-06-28
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1002/2016GL069330
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Title: Geophysical Research Letters
Source Genre: Journal
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Pages: - Volume / Issue: 43 Sequence Number: - Start / End Page: 6636 - 6642 Identifier: ISSN: 00948276