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Warm-air advection, air mass transformation and fog causes rapid ice melt
Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, S-10691 Stockholm, Sweden..
Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA.;NOAA, Earth Syst Res Lab, Boulder, CO USA..ORCID-id: 0000-0002-0973-9982
Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England..ORCID-id: 0000-0002-5051-1322
Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA.;NOAA, Earth Syst Res Lab, Boulder, CO USA..
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2015 (engelsk)Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, nr 13, s. 5594-5602Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2015. Vol. 42, nr 13, s. 5594-5602
Emneord [en]
warm-air advection, surface inversion, fog, surface energy balance, sea-ice melt, Arctic
HSV kategori
Forskningsprogram
SWEDARCTIC 2014, SWERUS-C3
Identifikatorer
URN: urn:nbn:se:polar:diva-2328DOI: 10.1002/2015GL064373ISI: 000358691300064OAI: oai:DiVA.org:polar-2328DiVA, id: diva2:858455
Tilgjengelig fra: 2015-10-02 Laget: 2015-10-02 Sist oppdatert: 2017-12-01

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