Characterization of the summer surface mesoscale dynamics at Dome F, Antarctica

• Published in: Atmospheric Research
• Main Authors: González Herrero, Sergi, Vasallo, Francisco, Sanz, Pablo, Quesada del Corral, Antonio, Justel, Ana
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2021
• Subjects: Antarctic Plateau; Weather observations; Mesoscale dynamics; Cold pools; Surface air temperature; Antarctic; The Antarctic; Dome F; Antarc*; Antarctica
• Online Access: https://hdl.handle.net/20.500.11765/13038

This article characterizes the mesoscale surface air temperature (SAT) gradients around the Dome F on the Antarctic Plateau combining ERA5 reanalysis outputs and in-situ weather observations. For this we took advantage of a mobile automatic weather station (M-AWS) that allowed us to record meteorological observations in interesting areas not covered by other AWS. We found that night-time SAT gradients are very variable from night to night. ERA5 does not adequately represent thermal gradients and their daily changes and tends to underestimate them. In particular, it fails to reproduce the cold pool observed by M-AWS over the depressed areas of the terrain. The performance of ERA5 over the plateau is better when observed SAT gradients are weak. Besides, we observed surface meso-β eddies with warm cores and horizontal gradients of more than 5 °C 100 km−1 simulated by ERA5 that have implications for site selection to establish new telescopes for astronomical observations. This study helps to interpret the daily performance of SAT values provided by reanalyisis on the Antarctic Plateau and complements climatological evaluations of SAT in the region. Finally, this study raises the necessity to increase in-situ weather observations, not only on the ridges of the Antarctic plateau where the majority are located, but also in the areas of depression to have a better picture of the weather and climate of the plateau. This work was supported by the Spanish Agencia Estatal de Investigación (AEI) and Fondo Europeo al Desarrollo Regional (FEDER) through the MICROAIRPOLAR project [grant number CTM2016-79741-R] and the Generalitat de Catalunya through the ANTALP Research Group [grant number 2017 SGR 1102].