The objective definition for the geographic region of Jiangnan Rainy Season and its onset and retreat date

Zhan Fengxing; He Jinhai; Zhang Yizhi; Zhu Zhiwei

doi:10.3969/j.issn.0253-4193.2015.06.001

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Zhan Fengxing, He Jinhai, Zhang Yizhi, Zhu Zhiwei. The objective definition for the geographic region of Jiangnan Rainy Season and its onset and retreat date[J]. Haiyang Xuebao, 2015, 37(6): 1-11. doi: 10.3969/j.issn.0253-4193.2015.06.001

Citation:

Zhan Fengxing, He Jinhai, Zhang Yizhi, Zhu Zhiwei. The objective definition for the geographic region of Jiangnan Rainy Season and its onset and retreat date[J]. Haiyang Xuebao, 2015, 37(6): 1-11. doi: 10.3969/j.issn.0253-4193.2015.06.001

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The objective definition for the geographic region of Jiangnan Rainy Season and its onset and retreat date

doi: 10.3969/j.issn.0253-4193.2015.06.001

1.
Key Laboratory of Meteorological Disaster of Ministry of Education(KLME), College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China;Jiangxi Meteorological Bureau, Nanchang 330046, China
2.
Key Laboratory of Meteorological Disaster of Ministry of Education(KLME), College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
3.
Climate Center of Jiangxi Meteorological Bureau, Nanchang 330046, China

Received Date: 2015-01-13

Abstract

Abstract

Using the 1 675 gauge data from National Meteorological Information Center and the NCEP/NCAR reanalysis data, the pentad mean averaged precipitation index which can eliminate the regional differences between gauges is defined. The rotated empirical orthogonal function decomposition (REOF) is applied to investigate the seasonal march of the pentad mean precipitation over the entire China. We obtain two leading modes (e. g. the South and North mode) and their time coefficients. The second mode of REOF presents well the Jiangnan Rainy Season (JRS).Given the consistence of three independent criterion, e.g., the seasonal process of pentad mean precipitation, the interannual variability of precipitation index seasonal variation (April-June mean minus June-August mean) and the interannual variability of mean state of rainy season (April-June) in south of China (south of 31°Nand east of 110°E), the overlap region of these three is objective defined as the geographic region of JRS. Using three variables in the defined geographic region of JRS, e.g., the rainfall index, regional 925 hPa meridional wind and the western North Pacific subtropical high ridge line position at 500 hPa, the onset and retreat dates of JRS from 1961 to 2012 are determined objectively. The purposes of this paper are to provide reference for monitoring JRS and scientific basis for its prediction.
- Jiangnan Rainy Season,
- objectively definition of geographic region,
- rainfall seasonal march,
- the onset and retreat date

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References(38)

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