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Advanced Taiwan Ocean Prediction System

Tseng, Tsu-Lun - ALL News | 2019-10-29 | Count:218


Title: Topographic Effects on Precipitation Seasonality over East Asia


The stage-wise precipitation over East Asia, primarily from spring to summer, is influenced by the nearby monsoons and can be topographically driven. Corresponding to the onset of Asian summer monsoon circulation, the Meiyu–Baiu occurs rapidly in May, replacing the East Asian spring rains. The Meiyu–Baiu rapidly terminates in late July due to the synchronous development of the broad-scale subtropical monsoons from Africa to the East Asia–Western North Pacific (WNP). In late summer–autumn, the monsoonal circulation gradually retreats, in contrast to the rapid and stepwise transitions of the monsoon. The topographic driving of seasonal details is dramatic and has been considered a crucial factor affecting the East Asian seasonality. In addition to the roles played by large mountains such as the Tibetan Plateau and Himalayas, the role of the Indochina Peninsula is a recent emphasis of research regarding the seasonal details of the Asian monsoon. A renewed interest on the topographic effect has been placed on understanding the role of the south-north oriented narrow mountain ranges south of the Tibetan Plateau, e.g., the Western Ghats, the Arakan Yoma, and the Annamese Cordillera etc. The effects of some crucial mesoscale mountain ranges on climate can be at a spatial scale much larger than previously believed. Emphasis has been further made on understanding thermodynamic and dynamic influences in the Far East–Okhotsk region on the diverse stages of East Asian precipitation.

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