MATEC Web Conf.
Volume 246, 20182018 International Symposium on Water System Operations (ISWSO 2018)
|Number of page(s)||9|
|Section||Parallel Session I: Water Resources System|
|Published online||07 December 2018|
The relationship between Pacific SSTA and Autumn Extreme Precipitation Events of China
1 Yunnan Institute of Water & Hydorpower Engineering Investigation, Design and Research, Kunming 650021, China ;
2 College of Hydrology and Water Resource, Hohai University, Nanjing 210098, 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.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.