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A satellite-based climatology of wind-induced surface temperature anomalies for the Antarctic

  • It is well-known that katabatic winds can be detected as warm signatures in the surface temperature over the slopes of the Antarctic ice sheets. For appropriate synoptic forcing and/or topographic channeling, katabatic surges occur, which result in warm signatures also over adjacent ice shelves. Moderate Resolution Imaging Spectroradiometer (MODIS) ice surface temperature (IST) data are used to detect warm signatures over the Antarctic for the winter periods 2002–2017. In addition, high-resolution (5 km) regional climate model data is used for the years of 2002 to 2016. We present a case study and a climatology of wind-induced IST anomalies for the Ross Ice Shelf and the eastern Weddell Sea. The IST anomaly distributions show maxima around 10–15K for the slopes, but values of more than 25K are also found. Katabatic surges represent a strong climatological signal with a mean warm anomaly of more than 5K on more than 120 days per winter for the Byrd Glacier and the Nimrod Glacier on the Ross Ice Shelf. The mean anomaly for the Brunt Ice Shelf is weaker, and exceeds 5K on about 70 days per winter. Model simulations of the IST are compared to the MODIS IST, and show a very good agreement. The model data show that the near-surface stability is a better measure for the response to the wind than the IST itself.

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Author:Günther HeinemannORCiD, Lukas Glaw, Sascha WillmesORCiD
Parent Title (English):Remote sensing
Place of publication:Basel
Document Type:Article
Date of completion:2019/07/19
Date of publication:2019/07/19
Publishing institution:Universität Trier
Contributing corporation:The publication was funded by the Open Access Fund of Universität Trier and the German Research Foundation (DFG)
Release Date:2019/07/19
Tag:Antarctic; MODIS ice surface temperatures; ice shelves; katabatic winds
GND Keyword:Antarktis; Katabatischer Wind; Satellitenfernerkundung; Schelfeis; Wärmeanomalie
Volume (for the year ...):11
Issue / no.:13
Number of pages:17
Institutes:Fachbereich 6 / Raum- und Umweltwissenschaften
Dewey Decimal Classification:9 Geschichte und Geografie / 90 Geschichte / 900 Geschichte und Geografie
Licence (German):License LogoCC BY: Creative-Commons-Lizenz 4.0 International

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