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研究进展-Contribution of tropical cyclones and ENSO to extreme precipitation over coastal and inland areas of China
发布时间: 2017-12-15  

Qiang Zhang, Xihui Gu, Jianfeng Li, Peijun Shi, Vijay P. Singh

[Qiang Zhang, Peijun Shi]. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing 100875, China.

[Qiang Zhang, Peijun Shi]. Faculty of Geographical Science, Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China.

[Qiang Zhang, Peijun Shi]. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China.

[Xihui Gu]. School of Environmental Studies, China University of Geosciences, Wuhan, China.

[Jianfeng Li]. Department of Geography, Hong Kong Baptist University, Hong Kong, China

[Vijay P. Singh]. Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering, Texas A&M University, College Station, Texas, USA.

 

ABSTRACTThe coastal part of China and its surrounding regions are dominated by highly-dense population and highly-developed economy. Extreme precipitation events (EPEs) cause a lot of damage and hence, changes in these events and their causes have been drawing considerable attention. This study investigated EPEs resulting from Western North Pacific (WNP) Tropical Cyclones (TCs) and their potential link to El Nino-Southern Oscillation (ENSO), using TC track data, daily precipitation data from 2313 stations for 1951-2014, and NCAR/NCEP reanalysis dataset. Two types of EPEs were considered: EPEs within 500 km from the TC center; and those caused by the mesoscale and synoptic system called as the Predecessor Rain Events (PREs) beyond 1000 km from the TC center. Results indicated significant impacts of TCs on EPEs along the coastal areas, and discernable effects in inland areas of China. However, the effect of TCs on EPEs tended to be modulated by ENSO. During neutral years, inland areas of China are more affected by TC-induced extreme precipitation than during El Nino or La Nina years with the highest density of TC tracks and the larger-than-average numbers of tropical storms (wind speed was 17.2-32.6 m3/s), typhoons (wind speed was larger than 32.6 m3/s) and landfalling TCs. During the El Nino phase, the central and eastern equatorial Pacific was characterized by higher sea surface temperature (SST), greater low-level vorticity (1000hPa) and upper-level divergence (250hPa), and stronger prevailing westerlies, which combined to trigger the movement of mean genesis to the eastern/southeastern WNP, and hence fewer TCs passing through the Chinese territory.

Published in Journal of Climate, 2018, doi:10.1175/JCLI-D-17-0474.1.


 
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