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Warm-air advection, air mass transformation and fog causes rapid ice melt
Stockholm University, Faculty of Science, Department of Meteorology .
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Number of Authors: 12
2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 13, 5594-5602 p.Article in journal (Refereed) Published
Abstract [en]

Direct observations during intense warm-air advection over the East Siberian Sea reveal a period of rapid sea-ice melt. A semistationary, high-pressure system north of the Bering Strait forced northward advection of warm, moist air from the continent. Air-mass transformation over melting sea ice formed a strong, surface-based temperature inversion in which dense fog formed. This induced a positive net longwave radiation at the surface while reducing net solar radiation only marginally; the inversion also resulted in downward turbulent heat flux. The sum of these processes enhanced the surface energy flux by an average of similar to 15Wm(-2) for a week. Satellite images before and after the episode show sea-ice concentrations decreasing from > 90% to similar to 50% over a large area affected by the air-mass transformation. We argue that this rapid melt was triggered by the increased heat flux from the atmosphere due to the warm-air advection.

Place, publisher, year, edition, pages
2015. Vol. 42, no 13, 5594-5602 p.
Keyword [en]
warm-air advection, surface inversion, fog, surface energy balance, sea-ice melt, Arctic
National Category
Earth and Related Environmental Sciences
Research subject
Atmospheric Sciences and Oceanography
Identifiers
URN: urn:nbn:se:su:diva-120094DOI: 10.1002/2015GL064373ISI: 000358691300064OAI: oai:DiVA.org:su-120094DiVA: diva2:851156
Available from: 2015-09-03 Created: 2015-09-01 Last updated: 2017-12-04Bibliographically approved

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Tjernström, MichaelSedlar, JosephSotiropoulou, Georgia
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