黑河实验区的自然地理状况及气候背景

THE NATURE GEOGRAPHY STATE AND CLIMATE BACKGROUND IN THE HEIHE EXPERIMENTAL REGION

本文利用４０多年来的气候资料，对本区的平均流场、气压场、降水场及冬、夏的气候日变化进行了分析。指出：本区是行星西风绕过和越过青藏高原后形成的两个湍流尾流区的开端处。本区近４０年的气候变化可分为“暖丰（水）”和“冷枯（水）”两种时段；“暖丰”时段与多震时段、地球自转加速时段和气温与降水呈正相关时段四者是一致的；“冷枯”时段则反之。１９９２年可能是最近的“暖丰”时段的结束年，即将开始的“冷枯”段，至少持续１０年。对ＦＯＰ期间（１９９０年８月—１９９１年底）各气象站的资料进行了仔细分析，指出ＦＯＰ期间本区大气候特征是暖干，但各种日变化现象与多年平均情况基本一样。

By using the climatic data more than 40 years,an analysis of mean streamline field, pressure pattern,precipitation field and the daily variation of climate in summer and winter over this rigion have been made It pointed out:this region was the rise of the two turbulent wake zones which were formed by the planetary west wind flowed around and flowed up over the Qinghai-Xizang Plateau The late 40-year climatic change of the region might be divided into two phases(time intervals),i e “warm-high flow year”and “cold-low flow year”,the former coincided with the phase of more earthquake,the earth rotation accelerated motion and the phase of temperature and precipitation appeared positive correlation,that is to say these four events were agreeable;the latter,on the contrary 1992 might be the end of the late“warm-high flow year”,the “cold-low flow year”phase will begin very soon and will last ten years at least A detail analysis of the data of each meteorological observing station has been done during the duration of FOP (Aug 1990 to the end of 1991) It showed that the macroclimate was characterized by warm and dry climate in this region during the duration of FOP,but various daily variations phenomena were the same as secular mean conditions At last,the weather situation background of several heavy rain and heavy snow has been described briefly during the duration of FOP