Abstract
This study investigates the impacts of tropical storms originated from the Bay of Bengal (BOBTSs) on the precipitation and soil moisture over the Tibetan Plateau (TP) in April-June (AMJ) and September-December (SOND) during 1981–2011 based on the best track dataset provided by Joint Typhoon Warning Centre (JTWC). Results indicate that there are about 1.35 BOBTSs influence the TP in each year and most of them occurred in May and October, and the BOBTSs in AMJ influence the TP with larger extension and higher latitudes than those in SOND. The maximum regional precipitation induced by the BOBTSs accounts for more than 50% for the total precipitation in the corresponding month and about 20% for the season. Further analysis reveals that the surface soil moisture anomalies induced by the BOBTSs can persist only 20–25 days in AMJ, and the case is also true for the snow depth in SOND. Numerical simulations by using the regional climate model of Weather Research and Forecasting (WRF) suggest that the soil moisture anomalies in the sub-surface can last 2 months whereas for the surface it can persist only about 20 days, which agrees well with the observation analysis. Overall, the effect of the preceding BOBTSs on the snow depth and soil moisture anomalies over the TP cannot maintain to summer, and there is no robust connection between the BOBTSs and summer precipitation anomalies in East China. Moreover, since the mid-1990s, the spring rainfall induced by the BOBTSs over the TP seems to be enhanced to a certain degree because of the intensified BOBTSs.
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Xiao, Z., Duan, A. Can the tropical storms originated from the Bay of Bengal impact the precipitation and soil moisture over the Tibetan Plateau?. Sci. China Earth Sci. 58, 915–928 (2015). https://doi.org/10.1007/s11430-014-5028-8
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DOI: https://doi.org/10.1007/s11430-014-5028-8