Weather and Climate |
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Analysis of High Temperature Climatic Characteristics in Ningxia and Atmospheric Circulation Anomaly |
YANG Jian-ling1,2, FENG Jian-min1, YAN Jun1, WANG Jian-ying1, ZHENG Guang-fen1 |
1.Key Laboratory of Meteorological Disaster Preventing and Reducing in Ningxia, Yinchuan 750002, China;
2.Ningxia Climate Center, Yinchuan 750002, China |
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Abstract Based on the daily maximum temperature data from 24 meteorological stations in Ningxia during 1960-2009 and the NCEP/NCAR reanalysis geopotential height data, the spatial distribution, inter-annual and inter-decadal variation trends of high temperature days in Ningxia, and the corresponding atmospheric circulation anomaly were analyzed. Results showed that the frequency of appearing high temperature was relatively high in mid-north area of Ningxia with Dawukou and Tongxin as two high frequency centers, and the highest frequency occurred in July. The number of high temperature days was most in 1971, 2000, 2001 and 2005, and no occurred in 1962, 1979 and 1989. Inter-decadal abrupt change of high temperature frequency occurred in the middle 1990s, and the average annual days with high temperature in Ningxia during 1997-2009 increased to 4.4 times that during 1960-1996. The inter-annual and inter-decadal anomalies of high temperature frequency are associated with wide range atmospheric circulation anomalies, namely a wave train distribution of high-level height anomaly field in a wide range from western Europe to the Bering Strait. If the meridional circulation in middle and high latitude of Asia is weak, the days with high temperature in Ningxia are most. On the contrary, if the meridional circulation is strong and the north cold air moves southward easily, the days with high temperature in Ningxia are less.
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Received: 21 March 2012
Published: 20 September 2012
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