The Intra-Seasonal Heterogeneity of the Strong Precipitation Events and the Corresponding Atmosphere Circulation Characteristics in the Middle and Upper Yellow River Basin in Flood Season

doi:10.7522/j.issn.1000-694X.2013.00033

JOURNAL OF DESERT RESEARCH

2013, Vol. 33

Issue (1): 239-248 DOI: 10.7522/j.issn.1000-694X.2013.00033

Hydrology and Water Resource

The Intra-Seasonal Heterogeneity of the Strong Precipitation Events and the Corresponding Atmosphere Circulation Characteristics in the Middle and Upper Yellow River Basin in Flood Season

WANG Nan, LI Dong-liang, ZHANG Jie

Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science & Technology, Nanjing 210044, China

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Abstract

Based on the daily precipitation data collected in May through October during 1960-2008 and the NCAR/NCEP reanalysis data, we analyzed the characteristics of the rainfalls in the middle and upper Yellow River basin in flood season and the corresponding atmosphere circulation pattern. The studied area could be divided into plateau area, arid area and monsoon area if the climate zone and the local river system were concerned. The heterogeneity of the three areas was evaluated with the strong precipitation concentration period (SCP) and the strong precipitation concentration degree (SCD). The results were summarized as follows: (1) The dependence of the precipitation on the strong rainfall was obvious in most area of the middle and upper Yellow River basin. The middle Shannxi Province and southern Shanxi province had fare intra-seasonal even distributed rainfalls, while Hetao area and northern Shaanxi province had some strong ones. (2) The average occurrence dates of the strong rainfall in flood season in plateau area was the earliest, followed by that in arid area, and then in monsoon area with a five-day delay. In south of the monsoon area, just Weihe, Jinghe and Luohe Basin and in east of the plateau area, the SCP changed greatly. In the 1990s, there took place significant decrease mutations of the SCP both in arid area and monsoon area, and that in arid area was earlier than that in monsoon area. (3) In the arid area, the high circulation situation in the SCP anomalous years showed that there would be strong rainfall in front of or behind of the flood season when the Western Pacific Subtropic High (WPSH) at 500 hPa on the northern side of 30°N, around 120°E, and the Southern Asia High (SAH) at 200 hPa on the eastern side of 120°E, around 30°N, moved towards each other or backwards each other. In the monsoon area, there was the same phenomenon as in the arid area when the WPSH located in 26°-30°N, around 120°E, meanwhile the SAH on the western side of 120°E, around 30°N.

Key words: middle and upper Yellow River strong precipitation concentration period (SCP) strong precipitation concentration degree(SCD) intra-seasonal heterogeneity atmosphere circulation

Received: 01 April 2012 Published: 20 January 2013

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	WANG Nan
	LI Dong-liang
	ZHANG Jie

Cite this article:

WANG Nan, LI Dong-liang, ZHANG Jie. The Intra-Seasonal Heterogeneity of the Strong Precipitation Events and the Corresponding Atmosphere Circulation Characteristics in the Middle and Upper Yellow River Basin in Flood Season. JOURNAL OF DESERT RESEARCH, 2013, 33(1): 239-248.

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http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00033 OR http://www.desert.ac.cn/EN/Y2013/V33/I1/239

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