地理学报 ›› 1965, Vol. 31 ›› Issue (1): 25-35.doi: 10.11821/xb196501003

• 论文 • 上一篇    下一篇

长江流域中下游和河北平原夏季旱涝环流特征的初步分析

张家诚, 管馥生, 斯公望   

  1. 中央气象局气象科学研究所
  • 出版日期:1965-01-15 发布日期:1965-01-15
  • 基金资助:

A PRELIMINARY ANALYSIS ON CERTAIN CHARACTERISTICS OF THE 500 MB CIRCULATION DURING THE DRY AND THE WET MONTHS IN THE YANGTZE VALLEY AND THE HOPEI PLAIN

CHANG CHIA-CHENG, KUN FU-SUN, SHIN KUNG-WANG   

  1. Central Meteorological Institute of the Central Meteorological Bureau
  • Online:1965-01-15 Published:1965-01-15

摘要: 降水的长期预报是当前农业生产迫切需要解决的问题之一。长期预报的依据是大气环流的演变规律以及环流特征与大范围天气分布之间的关系,本文的目的是在于分析长江中下游夏季产生旱与涝的环流特征,以期在环流形势预报的基础上作为预报天气特征的参考。

关键词:

Abstract: A comparative analysis is made of the 500 mb mean monthly circulation patterns over Asia during the wet months from May to August in the Yangtze Valley and North China. It is found that the 500 mb circulation patterns and the monthly height anomaly patterns are fundamentally different between the dry and the wet months. Furthermore, the characteristics of the circulation in the wet months are nearly the same as those of the mean circulation in June based on the average for ten years. The 500 mb circulation over North China Plain at the 10-day period of the wet month from July 21 to August 20 is markedly different between dry and wet periods. The circulation characteristics in the 10-day period of the wet months are nearly the same as those of the first 10-day period of August. Based on the result of the above mentioned analysis, the authors sug- gested that from the climatological view, June is the most rainy month in the Yangtze Valley while the first 10-day period of August is the most rainy period for the North- China Plain. The climatic periods during which the occurrence of rain is most frequent are closely related to certain climatic conditions of the general circulation. Only under such favourable circumstances, is it possible for warm and cold air masses to keep continual contact with the result of frequent rain in the afore-mentioned regions. It is apparent that there are close connections between weather and climate, circulation and precipita- tion. These arc of importance for the explanation of the great precipitation anomalies.