The summer rainfall anomaly of north china is closely related to indian low , west pacific subtropical high , westerly troughs and ridges in mid - latitude , south asia high , subtropical monsoon circulation and cold air activity on the corresponding period , and similar circulation pattern also appears in the preceding spring 结果表明： ( 1 )华北夏季降水异常与同期印度低压、西太平洋副高、中纬度西风槽脊、南亚高压、副热带季风环流和冷空气活动的异常都密切相关。华北夏季降水异常年春季的环流特征与夏季类似。
As a result , we find that in winter when the kuroshio is cooler than the normal , at following summer , the continental cyclone deepen and the east asia monsoon strengthen , that the mid - latitude blocking high weaken and zonal circulation develop , the east asia teleconnection of " - + - " is stired up , so that subtropical high weaken and diminish , and tend to east north , tropical monsoon trough strengthen and mei - yu front weaken , and tend to north , meanwhile south asia high weaken and diminish , and tend to eastvnorth , is easy to form eastern region type 结果发现当黑潮海温冷异常时，后期夏季大陆热低压加深，东亚夏季风偏强。中纬度阻塞高压减弱，东亚地区纬向环流发展，在东亚-西太平洋地区激发“ - + - ”的东亚遥相关型，从而西太平洋副高强度偏弱，面积偏小，位置偏东、偏北，东亚梅雨锋也偏弱，季风槽则变强，位置偏北。同时南亚高压偏弱，位置偏北、偏东，易形成东部型。
During the last 10 years , with the acquisition of much valuable intensive observations in a series of typhoon field experiments , the improvement of the weather monitoring network , the upgrade of atmospheric numerical models and the rapid development of computer powers , many problems in typhoon heavy rainfall research are further studied , such as the interaction between typhoons and mid - latitude weather systems , the interaction between typhoons and topography and underlying surface , the mesoscales of typhoons and the dynamics and so on 近10年来，随著我国一系列台风外场科学试验加密观测数据的获得、天气监测网的逐步完善、大气模式的改进以及电子计算机的飞速发展，台风与中纬度系统的相互作用、台风与地形下垫面相互作用、台风中小尺度及其动力学等方面均得到深入研究。
Because of the existence of meiyu precipitating cloud band the temperature dv is faint inside the meiyu trough and on account of large - scale prominent terrain available , significant temperature dv occurs on both sides of the trough , leading to the reinforcement of the subtropical high and middle latitude transformed high , and the deepening and narrowing of the trough in the night with the result that the relative intensity and precipitating function of the meiyu frontal rainfall system are changed at day and night , resulting in precipitation dv 由于梅雨云带的存在，梅雨锋低压槽内温度日变化很微弱；由于梅雨系统四围高大地形的存在，梅雨锋低压槽南北两侧温度日变化非常明显，使南海副高和中纬度变性高压在夜间增强，梅雨锋低压槽也在夜间变深、变窄，改变了早、晚时刻梅雨系统的相对强度和降水功能，导致降水日变化。
Analysis shows that when summer precipitation in north china is richer ( less ) , tropical east pacific ssta is colder ( warmer ) phase , and slp and 500hpa geo - potential height are negative ( positive ) anomaly over the asia , west pacific sub - high is northerner ( southerner ) , and block high in mid - highs latitude happens less ( more ) than normal , east monsoon is stronger ( weaker ) 分析表明华北夏季多(少)雨期，赤道中东太平洋ssta处于冷(暖)位相，在非洲大陆上slp利500hpa位势高度均为负(正)异常，西北太平洋副高位置偏北(南) ，中纬度阻塞高压发生频率较低(高) ，东亚夏季风偏强(弱) 。
