| Analysis of drought circulation characteristics in summer of Liaoning Province |
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| DOI：10.7606/j.issn.1000-7601.2017.06.40 |
| Key Words: drought in summer circulation characteristics subtropical anticyclone subtropical westerly jet axis Liaoning Province |
| Author Name | Affiliation | | FANG Yi-he | Regional Climate Center of Shenyang, Shenyang, Liaoning 110016, China；School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China | | WU Qiong | Regional Climate Center of Shenyang, Shenyang, Liaoning 110016, China | | DU Bing-chen | College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China | | QIN Mei-ou | Regional Climate Center of Shenyang, Shenyang, Liaoning 110016, China | | XU Fang-shu | Liaoning Meteorological Service Center, Shenyang, Liaoning 110016, China | | LIN Zhong-guan | Liaoning Meteorological Service Center, Shenyang, Liaoning 110016, China | | WANG Dang | Liaoning Branch of Meteorological Cadres Training Institute CMA, Shenyang, Liaoning 110016, China | | YU Yang | Liaoning Meteorological Information Center, Shenyang, Liaoning 110016, China |
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| Abstract: |
| Based on the monthly mean rainfall data from 54 observational stations in summer during 1963 to 2015 in Liaoning Province and the NCEP/NCAR monthly circulation field reanalysis information, we analyzed the variation characteristics of precipitation in summer and the circulation characteristics in anomaly years. Combined with comparative analysis of circulation field in summer during 2014 to 2015 with the circulation field in abnormal years, we clarified the drought circulation characteristics in summer and the circulation field factors caused drought in summer during 2014 to 2015 in Liaoning. The results showed that: The cooperation of large scale circulation system in different height of troposphere in East Asia was the main reason for the anomaly precipitation in summer in Liaoning. The circulation fields characteristics of drought in summer during 2014 to 2015 in Liaoning were all similar with the condition of anomaly drought in summer. The position of west pacific subtropical ridge line was partial to south, and its northwest side was negative anomaly, so it was unuseful to subtropicalhigh towards west and north. Because the subtropicalhigh was inclined to south, so the southwest water vapor transport was not sufficient in Liaoning region. The subtropical westerly jet axis was located in south of Liaoning and the 200 hPa zonal wind anomaly over the south of Liaoning was positive, northern part was negative. This allocation of large scale circulation in different height of troposphere was the main circulation reason for the summer drought during 2014 to 2015 in Liaoning. |
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