Abstract
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.
Highlights
Every year, beginning in March, subtropical East Asia (20◦ N–35◦ N) undergoes a series of dynamical stages in precipitation [1,2,3,4], including persistent spring rains [5], stepwise development of the Meiyu-Baiu [6,7], and the typhoon season [8] (Figure 1)
Following previous modeling works in which we explored the role of the Indochina Peninsula’s
Simulation), this study expanded the analysis to investigate the onset versus retreat processes of the subtropical East Asian summer analysis to investigate the onset versus retreat processes of the subtropical East Asian summer
Summary
Every year, beginning in March, subtropical East Asia (20◦ N–35◦ N) undergoes a series of dynamical stages in precipitation [1,2,3,4], including persistent spring rains [5], stepwise development of the Meiyu-Baiu [6,7], and the typhoon season [8] (Figure 1). [11,12], the Meiyu-Baiu terminates, subtropical East Asia enters the typhoon season [8], and Japan enters the post-Baiu season [13] These diverse stages of East Asian precipitation, which displays asymmetric monsoon seasonality Asian continental monsoon no longer has dominant control of the large-scale circulation feature feature [18] and what drives the summer monsoon retreat process has not been well understood.[18]. The topographic driving of seasonal characteristics is dramatic and been considered a crucial factor affecting the East Asian seasonality [10,19,20]. The north-south-oriented mountain ranges over the Peninsula have been suggested driving factor of the early South Asian and East Asian summer monsoons [28,29].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
