• 论文 •

### 我国西北陕、甘、宁、青地区的自然天气季节

1. 兰州中心气象台
• 出版日期:1963-10-15 发布日期:1963-10-15
• 基金资助:

### THE NATURAL SYNOPTIC SEASONS OF SHENSI. KANSU NINGHSIA AND CHINGHAI. NORTH-WEST CHINA

K. C. Hsu, L. Ko, J. C. Wu

1. Central Meteorological Obeservatory of Lanchow
• Online:1963-10-15 Published:1963-10-15

Abstract: From an analysis of the vertical profile of the middle-high latitudes (45?-65癗), the mean westerly geostrophic winds and the tonal index at 500-mb level, it is found that, the annual march of the general circulation at 500-mb over East-Asia may be divided into several distinct stages. Close relation is also found among the general cir- culation, secular fiv e-day mean temperature and precipitation of the North-West China. Based on the above mentioned factors, seven natural synoptic seasons are recognized, i.e., early Winter, middle }}Vinter, late Winter, Spring, early Summer, deep Summer and Autumn. With respect to the length and weather conditions of the seasons are quite different from each other. Demarcation of the natural synoptic seasons is helpful to the long range weather prediction of the region concerned.