| Weather and Climate |
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| Influence of Abnormal Westerly Jet on Extreme Weather in Spring in Gansu Province |
| ZHANG Sheng-cai1,2, YANG Xian-rong1,2,3, ZHANG Jin-quan1,2,3, WANG Jin-song1,2, CAI Guang-zhen3,YAN Xu-dong3, ZHAO Zhi-wen3 |
1.Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou Institute of Arid Meteorology, China Meteorological Administrator, Lanzhou 730020, China;
2.Laboratory for Climate Studies, China Meteorological Administration, Beijing 100081, China;
3.Linxia Meteorological Bureau of Gansu province, Linxia 731100, Gansu, China |
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Abstract Some weather processes such as drought, strong wind, strong sandstorm, cold wave etc. in Gansu during 1970-2011 are analyzed based on the meteorological data and according to the standard of disaster weather occurring in spring. The relationship between disaster weather and westerly jet oscillation is obtained based on the convention MICAPS data. The oscillation strength and spatial scope of the axis and nucleus of westerly jet have direct connection with occurrence and development of disaster weather occurred in Gansu in spring. When westerly jet developed steadily in Eurasian and moved to 65° N latitude, continuous drought occurred in most regions of Hexi and Hedong regions of Gansu province. When westerly jet moved down south to the Balkhash Lake and developed to "L" flow field, strong cold wave events are easily formed in Gansu resulting from short-wave splited rapids axis and nucleus enter Gansu in spring. Generally, if only high jet exists, jet at near surface must develops, and strong wind, strong sandstorm, cold wave events will take place in Gansu in spring.
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Received: 24 February 2012
Published: 11 April 2012
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2012, Vol. 32 
