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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (6): 1874-1883    DOI: 10.7522/j.issn.1000-694X.2013.00043
Weather and Climate     
A Climatic Analysis on the Precipitation Features and Anomaly in Northwest China
CHEN Zhi-kun1,2, ZHANG Shu-yu3, LUO Jia-li1, LI Zhao-rong4
1.Ministry of Education Key Laboratory of Semi-Arid Climate Change, Lanzhou University, Lanzhou 730020, China;
2.National Marine Environmental Forecasting Center, Beijing 100081, China;
3.Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
4.Lanzhou Central Meteorological Observatory, Lanzhou 730020, China
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Abstract  

With EOF, REOF,Wavelet analysis and catastrophe analysis methods, we studied the spatial anomaly features and time evolution rule of precipitation in northwest China using the precipitation data collected in 128 observational stations during in 1971-2009. The results showed that, the first three loading vector field could reveal the most anomaly structures of precipitation in northwest China; the anomaly pattern could be summered as even in the whole area, varying from south to north, and vaarying from east to west; the first seven rotated loading vector fields could repersent six principal precipitation anomaly areas, northeast Qinghai-Tibet Plateau, Weihe River basin, Qinghai plateau, northern Xinjiang, southern Xinjiang and Hexi corridor; the northwest China saw a fluctuations in precipitation in recent 40 years, and no obvious long-term trend was found although some short-term dryer-wetter conversions existed; different anomaly regions showed different trends; the precipitation in northwest China had about 3-5 years, 10 years, and 20 years periodic variations; there existed different prevailing periods among different areas and different prevailing times within one area.

Key words:  northwest china      precipitation anomaly      empirical orthogonal function      rotated empirical orthogonal function      wavelet analysis      catastrophe analysis     
Received:  12 August 2012      Published:  08 October 2012
ZTFLH:  P467  

Cite this article: 

CHEN Zhi-kun1,2, ZHANG Shu-yu3, LUO Jia-li1, LI Zhao-rong4. A Climatic Analysis on the Precipitation Features and Anomaly in Northwest China. JOURNAL OF DESERT RESEARCH, 2013, 33(6): 1874-1883.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00043     OR     http://www.desert.ac.cn/EN/Y2013/V33/I6/1874

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