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Title

Tropical cyclone rainfall in the Mekong River Basin for 1983–2016

AuthorsChen, Aifang; Ho, Chang-Hoi; Chen, Deliang; Azorín-Molina, César
KeywordsTropical cyclones
Occurrence
Rainfall
Mekong River Basin
Issue Date15-Sep-2019
PublisherElsevier
CitationAtmospheric Research 226: 66-75 (2019)
AbstractAs home to about 70 million people, the Mekong River Basin (MRB), located in Mainland Southeast Asia, is often influenced by tropical cyclones (TCs) landfalling. The TCs not only cause flood and storm hazards, but also play important roles in providing freshwater resource and welcomed sediment transports. Our study focuses on the climatology of TCs and associated rainfall (TCR) in the MRB for 1983–2016. Results show that: (i) the mean landfall occurrence of TCs is 6.2 yr−1, leading to 36.7 mm yr−1 of annual mean TCR (2.5% of the annual total precipitation), which mainly occur in monsoon-TC season (i.e., June–November); (ii) TCs highly concentrate on the lower eastern MRB, generating the largest TCR contribution of 12.4% to the annual total precipitation; (iii) the annual mean contribution of TCs induced extreme precipitation - R20mm and R50mm (days of heavy precipitation rate ≥20 mm day−1 and ≥50 mm day−1, respectively) - to that from annual total precipitation is large in the lower eastern MRB; (iv) over 60% of the basin area is influenced by TCR on average; and (v) a significant weakening trend of the TC frequency has been observed. The present findings lay a foundation for further in-depth research of the potential influence of the dynamic TCs and the associated rainfall in the MRB.
Publisher version (URL)http://dx.doi.org/10.1016/j.atmosres.2019.04.012
URIhttp://hdl.handle.net/10261/201601
Identifiersdoi: 10.1016/j.atmosres.2019.04.012
issn: 0169-8095
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