热力强迫对副热带高压北跳类型影响机制的分析  

ANALYSIS OF IMPACT MECHANISM FOR THERMAL FORCING ON THE TYPE OF NORTH SHIFT OF THE WESTERN PACIFIC SUBTROPICAL HIGH

作　　者：刘春 李跃凤[2] 宋伟[2,4] 刘自牧 LIU Chun;LI Yue-feng;SONG Wei;LIU Zi-mu(Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072,China;Training Center,China Meteorological Administration,Beijing 100081,China;Neijiang Meteorological Bureau,Neijiang 641000,China;Nanjing University of Information Science and Technology,Nanjing 210044,China;Sichuan Meteorological Service Center,Chengdu 610072,China)

机构地区：[1]高原与盆地暴雨旱涝灾害四川省重点实验室,四川成都610072 [2]中国气象局气象干部培训学院,北京100081 [3]内江市气象局,四川内江641000 [4]南京信息工程大学,江苏南京210044 [5]四川省气象服务中心,四川成都610072

出　　处：《热带气象学报》2018年第4期546-553,共8页Journal of Tropical Meteorology

基　　金：国家自然科学基金重点项目(91337215);国家自然科学基金面上项目(41275051)共同资助

摘　　要：通过分岔理论,讨论在取Ψ_A~*=0.15,Ψ_L~*=Ψ_M~*=Ψ_N~*=0条件下,Ψ_K~*和Ψ_C~*对副高北跳的影响。在Ψ_K~*值固定的情况下,可以准确求得副高北跳的临界热力参数值。在此基础上,通过对临界热力参数的分析,得到了对于副*K|<0.075 8时,没有副高北跳现象发生;当|Ψ_K~*|>0.279 3时,将出现副高不在长江流域停滞而直接跳跃到黄河流域的空梅情况;当0.075 8<|Ψ_K~*|<0.279 3,将会出现副高的二次北跳现象,但在其绝对值较小时,入梅时的北跳并不明显,只是在出梅时有一次弱北跳,此时,雨带不集中在长江流域,梅雨不明显。Through the bifurcation theory,the impact ofΨK^*andΨC^*on the north shift of the Western Pacific subtropical high(WPSH)is discussed under the conditions ofΨA^*=0.15,ΨL^*=ΨM^*=ΨN^*=0.In the case ofΨK^*as a fixed value,critical thermal parameter values about the north shift of the WPSH were acquired accurately.On this basis,through an analysis of the critical thermal parameters,the criterion of the type of the north shift of the WPSH was obtained.Through calculation,the result can be obtained as follows.In a certain range,when|ΨK^*|<0.075 8,there is no north jump of the subtropical high.When|ΨK^*|>0.279 3,there exits the phenomenon,in which the subtropical high does not stagnate over the Yangtze River basin,but jumps directly to the Yellow River basin.When 0.075 8<|ΨK^*|<0.279 3,the north shift does not happen.However,when its absolute value is small,the north shift is not obvious in the set-in of plum rains,but there is a weak north shift when the plum rains end.At this time,the rain belt is not concentrated in the Yangtze River basin where the plum rains are not obvious.

关 键 词：气候学 动力学特征 分岔 副高北跳类型 临界热力参数 

分 类 号：P434.4[天文地球—大气科学及气象学]