CAJ | 학술논문

2011年3月15日～18日，云南省玉溪市出现一次强倒春寒天气过程，平均气温除元江外，其余县仅有6．2～8．8℃；48小时最高气温下降17～23℃，通海16日最低气温只有1．8℃。分析1971～2010年历史上3月倒春寒发生前的1月大气物理特征量发现，此次倒春寒的原因主要是由于1月极涡面积偏大，3月强度迅速发展偏强，对应极圈西南侧为120～80gpm的负距平，有利于冷空气形成；经向环流南北交换大，南支槽和东亚槽比常年偏强，有利于暖湿气流的输送，青藏高压比常年偏弱，有利于冷空气南下，造成自北向南出现较大的降温幅度，其中云南东部等地降温幅度超过12℃。
2011년3월15일～18일，운남성옥계시출현일차강도춘한천기과정，평균기온제원강외，기여현부유6．2～8．8℃；48소시최고기온하강17～23℃，통해16일최저기온지유1．8℃。분석1971～2010년역사상3월도춘한발생전적1월대기물리특정량발현，차차도춘한적원인주요시유우1월겁와면적편대，3월강도신속발전편강，대응겁권서남측위120～80gpm적부거평，유리우랭공기형성；경향배류남북교환대，남지조화동아조비상년편강，유리우난습기류적수송，청장고압비상년편약，유리우랭공기남하，조성자북향남출현교대적강온폭도，기중운남동부등지강온폭도초과12℃。
From March 15, 2011 to 18, a process of strong late spring cold happened in Yuxi. The average temperature was 6. 2℃ - 8.8℃ in most counties, except Yuanjiang. 48 hrs maximum temperature dropped 17℃ - 23℃ , the minimum temperature of Tonghai was only 1.8℃ on March 16. Analysis of the history atmospheric physical factors in January from 1971 to 2010 found the main reason which caused the late spring cold was that the polar vortex area was too large in January, and rapidly became strong in March, corresponding to the negative anomaly 120 - 80 gpm of the southwest side of polar circle, was conducive to the formation of cold air. The northsouth exchange of meridional circulation was large, the southern trough and the East Asia trough were stronger than normal, was conducive to the transport of warm air. The Tibetan high was weaker than normal, was conducive to cold air moving southward, and caused the large temperature drop range from north to south. In eastern Yunnan, the range was more than 12℃ .