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Arctic Summer Airmass Transformation, Surface Inversions, and the Surface Energy Budget
Stockholms universitet, Meteorologiska institutionen (MISU).ORCID-id: 0000-0002-6908-7410
Vise andre og tillknytning
Rekke forfattare: 6
Ansvarlig organisasjon
2019 (engelsk)Inngår i: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 32, nr 3, s. 769-789Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

During the Arctic Clouds in Summer Experiment (ACSE) in summer 2014 a weeklong period of warm-air advection over melting sea ice, with the formation of a strong surface temperature inversion and dense fog, was observed. Based on an analysis of the surface energy budget, we formulated the hypothesis that, because of the airmass transformation, additional surface heating occurs during warm-air intrusions in a zone near the ice edge. To test this hypothesis, we explore all cases with surface inversions occurring during ACSE and then characterize the inversions in detail. We find that they always occur with advection from the south and are associated with subsidence. Analyzing only inversion cases over sea ice, we find two categories: one with increasing moisture in the inversion and one with constant or decreasing moisture with height. During surface inversions with increasing moisture with height, an extra 10-25 W m(-2) of surface heating was observed, compared to cases without surface inversions; the surface turbulent heat flux was the largest single term. Cases with less moisture in the inversion were often cloud free and the extra solar radiation plus the turbulent surface heat flux caused by the inversion was roughly balanced by the loss of net longwave radiation.

sted, utgiver, år, opplag, sider
2019. Vol. 32, nr 3, s. 769-789
Emneord [en]
Arctic, Sea ice, Clouds, Inversions, Advection, Surface fluxes
HSV kategori
Forskningsprogram
SWEDARCTIC 2014, SWERUS-C3
Identifikatorer
URN: urn:nbn:se:polar:diva-8311DOI: 10.1175/JCLI-D-18-0216.1ISI: 000455436200002OAI: oai:DiVA.org:polar-8311DiVA, id: diva2:1385184
Tilgjengelig fra: 2019-02-08 Laget: 2020-01-13

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Tjernström, Michael
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