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Identification of Air Masses Responsible for Warm Events on the East Antarctic Coast

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Title: Identification of Air Masses Responsible for Warm Events on the East Antarctic Coast
Authors: Kurita, Naoyuki Browse this author
Hirasawa, Naohiko Browse this author
Koga, Seizi Browse this author
Matsushita, Junji Browse this author
Steen-Larsen, Hans Christian Browse this author
Masson-Delmotte, Valerie Browse this author
Fujiyoshi, Yasushi Browse this author
Issue Date: 7-Dec-2016
Publisher: 公益社団法人 日本気象学会
Journal Title: SOLA (Scientific Online Letters on the Atmosphere)
Volume: 12
Start Page: 307
End Page: 313
Publisher DOI: 10.2151/sola.2016-060
Abstract: Warm events, periods when rising surface air temperatures can trigger surface melt, have been recorded during the austral summer at Syowa station on the East Antarctic coast. This study identifies air masses responsible for summer warm events at Syowa. Air masses arriving at Syowa are classified into marine and glacial sources based on their isotopic characteristics. Warm events are not associated with moist marine air intrusion, but with the downward flow of dry glacial air along the west side slope of the mountains in Enderby Land (EL). We use simulations from the Antarctic Mesoscale Prediction System (AMPS) to explore the atmospheric process responsible for the warmest event at Syowa. The model output illustrates several foehn-associated features such as low-level blocking, precipitation on the mountain's windward side, and mountain wave activity, with warm air ascending on the upstream slope and descending to Syowa. The foehn warming is caused by an easterly cross-mountain flow associated with a low-pressure system to the north of the EL coast. Future changes in synoptic cyclonic activity off the EL coast may have a significant impact on the frequency and intensity of foehn events at Syowa and the associated coastal warm events.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤吉 康志

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