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  2015, Vol. 34 Issue (2): 455-462    DOI: 10.7522/j.issn.1000-0534.2013.00200
    
Characteristics Analysis of Winter Extremely Cold Events during Recent 52 Years in Ningxia
JIA Hongyuan1,2,3, CHENG Yanjie4, ZHOU Cuifang5
1. Ningxia Key Laboratory of Meteorological Disaster Prevention and Mitigation, Yinchuan 750002, China;
2. College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China;
3. Ningxia Meteorological Observatory, Yinchuan 750002, China;
4. Beijing Climate Center, Beijing 100081, China;
5. Ningxia ShiZuiShan Meteorological Observatory, Dawukou 753002, China
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Abstract  Daily minimum temperature dataset at 19 stations in Ningxia is analyzed during the recent 52 years focusing on the spatial distribution and temporal variability characteristics of winter extremely cold events and the time period changes in Ningxia. The NCEP/NCAR reanalysis data is used to analyze the background of atmospheric circulation. Results show that the spatial distributions of cold and extreme low temperature events have good spatial consistency in Ningxia with a pattern of more cold events in the eastern and western part of Ningxia and less cold events in the central due to the blocking effect of Helan Mountains; the yearly frequency of cold events has reduced and intensity has weakened with a similar trend in the yearly cold days and the daily maximum station numbers. The significant time period of cold events is dominated from 2 to 6 years with intermittent stages and jumping characteristics. The abrupt time of cold event is identified around 1980. The number frequency of clod events is closely related atmospheric circulation anomalies. For more (less) cold events years, the high pressure was strong (weak) near the Ural Mountains, and there has a negative (positive) anomaly with low pressure deepened (weakened) in East Asia.
Key words:  Winter season      Extremely cold event      Ningxia     
Received:  10 April 2013      Published:  24 April 2015
P423.3+4  
Articles by authors
JIA Hongyuan
CHENG Yanjie
ZHOU Cuifang

Cite this article: 

JIA Hongyuan, CHENG Yanjie, ZHOU Cuifang. Characteristics Analysis of Winter Extremely Cold Events during Recent 52 Years in Ningxia. , 2015, 34(2): 455-462.

URL: 

http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2013.00200     OR     http://www.gyqx.ac.cn/EN/Y2015/V34/I2/455

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