Rinke, A., Knudsen, Erlend M., Mewes, D., Dorn, W., Handorf, D., Dethloff, K. and Moore, J. C. (2019). Arctic Summer Sea Ice Melt and Related Atmospheric Conditions in Coupled Regional Climate Model Simulations and Observations. J. Geophys. Res.-Atmos., 124 (12). S. 6027 - 6040. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-8996

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Abstract

Observations from 1979 to 2014 show a positive trend in the summer sea ice melt rate with an acceleration particularly in June and August. This is associated with atmospheric circulation changes such as a tendency toward a dipole pattern in the mean sea level pressure (SLP) trend with an increase over the Arctic Ocean and a decrease over Siberia. Consistent with previous studies, we here show the statistical relationship between the summer sea ice melt rate and SLP and that more than one SLP pattern is associated with anomalously high melt rates. Most high melt rates occur during high pressure over the Arctic Ocean accompanied by low pressure over Siberia, but a strong Beaufort High and advection of warm air associated with a cyclone located over the Taymyr Peninsula can also trigger anomalous high ice melt. We evaluate 10-member ensemble simulations with the coupled atmosphere-ice-ocean Arctic regional climate model HIRHAM-NAOSIM. The simulations have systematically low acceleration of sea ice melt rate in August, related to shortcomings in representing the strengthening pressure gradient from the Barents/Kara Sea toward Northern Greenland in recent decades. In general, the model shows the same classification of SLP patterns related to anomalous melt rates as the observations. However, the evolution of sea ice melt-related cloud-radiation feedback over the summer reveals contrary effects from low-level clouds in the reanalysis and in the simulations.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Rinke, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knudsen, Erlend M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mewes, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dorn, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Handorf, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dethloff, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moore, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-137408
DOI: 10.1029/2018JD030207
Journal or Publication Title: J. Geophys. Res.-Atmos.
Volume: 124
Number: 12
Page Range: S. 6027 - 6040
Date: 2019
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 2169-8996
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SURFACE RADIATION; CLOUDS; FEEDBACKS; LINKAGE; BUDGET; STATEMultiple languages
Meteorology & Atmospheric SciencesMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/13740

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