Abstract
Cold Air Mass Analysis of the Record-Breaking Cold Surge Event over East Asia in January 2016
Highlights
The East Asian winter monsoon (EAWM), a dominant circulation system in the northern hemisphere during boreal winter, strongly affects the weather and climate of East Asian countries (Ding and Sikka 2006)
The results of our analyses suggest that the thick cold air mass “C” is built up over southern Sakha through cold air mass convergence caused by the northerly and northeasterly flow of cold air masses from the Kolyma Lowland “C2” and advection from the Sea of Okhotsk “C1”
The southward flux of cold air mass is divided into two parts: one proceeds to the southwestern islands of Japan and Taiwan, and the other migrates along the lee slope of the Tibetan Plateau and reaches farther to Hong Kong
Summary
The East Asian winter monsoon (EAWM), a dominant circulation system in the northern hemisphere during boreal winter, strongly affects the weather and climate of East Asian countries (Ding and Sikka 2006). Takaya and Nakamura (2005a) examined the “Wave-train (Atlantic-origin) type” circulation, which corresponds to a Eurasian (EU)-like pattern modulated by a planetary wave (Wallace and Gutzler 1981; Wang and Lu 2016) They found that the interaction between low-level cold anticyclonic anomaly and the upper-level wave train plays an important role in the dramatic intensification of both anomalies, which results in CAOs. Some other studies have demonstrated that the formation of atmospheric blocking on the subarctic region can modulate EAWM and engender CAO (e.g., Park et al 2014). To date, understanding of the dynamical linkage between CAO and synoptic or large-scale circulations in a view of isentropic cold air mass remains insufficient, especially for the extreme events of CAO that cause record-breaking low temperatures and rare snowfall in East Asia.
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