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

As 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.

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Bibliographic Details
Main Authors: Chen, Aifang, Ho, Chang-Hoi, Chen, Deliang, Azorín-Molina, César
Other Authors: Chinese Academy of Sciences
Format: artículo biblioteca
Published: Elsevier 2019-09-15
Subjects:Tropical cyclones, Occurrence, Rainfall, Mekong River Basin,
Online Access:http://hdl.handle.net/10261/201601
http://dx.doi.org/10.13039/501100001728
http://dx.doi.org/10.13039/501100002367
http://dx.doi.org/10.13039/501100004543
http://dx.doi.org/10.13039/501100001809
http://dx.doi.org/10.13039/501100000780
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