Author(s): Jin-ming Chen; Shi-xiang Gu; Ru-cheng Jiang; Gui-hua Lu; Zhi-yong Wu; Xuan-xuan Du

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Keywords: No keywords

Abstract: 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.

DOI: https://doi.org/10.1051/matecconf/201824602056

Year: 2018