The relationship between Pacific SSTA and Autumn Extreme Precipitation Events of China
Based on 610 Meteorological stations daily precipitation datasets in China and NCEP/NCAR reanalysis datasets and NOAA reconstruct sea surface temperature from 1960~2009,the spatial and temporal coupling relationships between the Pacific SSTA and extreme precipitation events(EPE)are analyzed by using Singular Value of Decomposition method.Moreover,possible effect mechanism of Pacific SSTA for EPE is also discussed,the results are as follows: They are remarkable relations between equator middle-east Pacific ocean(EMEPO)SSTA and EPE.In anomaly cold years of EMEPO,compel 500hPa height field to show reverse PNA teleconnection pattern,intensity of west Pacific ocean subtropical high boost down.Meanwhile North Africa subtropical high become weeker compared with the mean.The trough over East Asia is abnormally weaker,and zonal circulation prevails over Asia,which is useful for the northward motion of southwestern water vapor.Meanwhile,the 500hPa geopotential height become weeker in New Siberian,leading to development and eastward motion of westerly trough.It is useful for the southward motion of stronger cold air,which is beneficial to the interaction between cold and warm air in Huang-Huai Basin,benefit the occurrence of EPE.However,wester china influenced by western vapor transportation,and vapor divergence in these areas,not benefit the occurrence of EPE.The opposite is true with positive SSTA in EMEPO.
CHEN Jin-ming GU Shi-xiang JIANG Ru-cheng LU Gui-hua WU Zhi-yong DU Xuan-xuan
Yunnan Institute of Water & Hydorpower Engineering Investigation,Design and Research,Kunming 650021, Yunnan Institute of Water & Hydorpower Engineering Investigation,Design and Research,Kunming 650021, College of Hydrology and Water Resource,Hohai University,Nanjing 210098,China
国际会议
2018 International Symposium on Water System Operations(ISWRSO 2018)(2018年水资源系统及调度国际研讨会)
北京
英文
1-9
2018-10-12（万方平台首次上网日期，不代表论文的发表时间）