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Role of Indochina Peninsula Topography in Precipitation Seasonality over East Asia

Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan
Department of Earth Sciences, National Taiwan Normal University, Taipei 11677, Taiwan
Utah Climate Center, Utah State University, Logan, UT 84322, USA
Department of Plants, Soils, and Climate, Utah State University, Logan, UT 84322, USA
Author to whom correspondence should be addressed.
Atmosphere 2018, 9(7), 255;
Received: 9 May 2018 / Revised: 25 June 2018 / Accepted: 29 June 2018 / Published: 6 July 2018
(This article belongs to the Special Issue Monsoons)
PDF [27701 KB, uploaded 10 July 2018]


Stage-wise precipitation evolution over East Asia, primarily from spring to summer, is influenced by nearby monsoons and can be topographically driven. Corresponding to the onset of the 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 subtropical monsoons extending 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. This study reviews the role of the Indochina Peninsula in modulating the seasonality of nearby monsoons, primarily based on previous modeling works, and expands the analysis for a full view of the annual monsoon cycle. The review and additional results highlight the role of the topographical processes of the Indochina Peninsula in driving the rapid monsoonal transitions, which correspond to the early summer vertical circulation coupling over the Bay of Bengal-Indochina Peninsula and the late-July WNP monsoon onset. In the simulation with a flattened topography, the southerly winds disappear over the Indochina Peninsula and the westerly winds gradually expand eastward across the Indochina Peninsula in the lower troposphere. View Full-Text
Keywords: East Asian precipitation; asymmetric seasonal variation; Indochina Peninsula topography East Asian precipitation; asymmetric seasonal variation; Indochina Peninsula topography

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Wu, C.-H.; Huang, W.-R.; Wang, S.-Y.S. Role of Indochina Peninsula Topography in Precipitation Seasonality over East Asia. Atmosphere 2018, 9, 255.

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