摘要
利用黄河源区近40年的温度、降水资料,分析了黄河源区气温与降水的时空分布特征和变化趋势。结果表明:黄河源区东北部的兴海、同德和东南部的久治县热量条件相对较好,由东向西随着纬度、尤其是随海拔的升高年平均气温逐渐下降;黄河源区年平均气温的差异很大,最暖的兴海县比最寒冷的称多县年平均气温高出6 2℃;降水年内分配集中在5～9月份,降水量占年总量的85 4%;近40年来年降水量无明显的变化趋势,但冬、春季的降水量呈明显的增多,而夏、秋季降水量呈明显的减少;气温呈明显的升高趋势,20世纪90年代比60年代年平均气温偏高0 5℃,≥0℃积温比60年代增加60～70℃,80年代以来增温主要出现在冬季和秋季。
Distributive feature of space-time and change trend on air temperature and precipitation in source region of the Yellow River was analyzed utilizing datum on air temperature and precipitation in the later 40 years in this region.The results showed:quantity of heat in Xinghai,Tongde located northeast of source region of the Yellow River and Jiuzhi located southeast of same is better than other area;the annual average air temperature is slowed along with rising latitude and altitude,especially altitude changed from east to west;the annual average air temperature made a remarkable difference and its annual average air temperature in Xinghai extended that of in Chenduo to 6.2℃;annual precipitation main felled during May to September and it was 85.4% of total precipitation;In the later 40 years precipitation for years changed a little,but the precipitation in spring and winter increased in evidence but in summer and autumn obviously declined,annual average air temperature in the 1990' extend that of the 1960'to 0.5℃.The accumulated temperature above 0℃ in the 1990'was higher 60～70℃ than that of 1960'.Since the 1980',the temperature rising main happened in winter and autumn.
出处
《青海大学学报（自然科学版）》
2004年第1期19-24,共6页
Journal of Qinghai University(Natural Science)
基金
青海省科技厅重点攻关项目:江河源区生态环境的演变与质量评价体系研究(2002-N-10)
关键词
黄河源区
气候特征
气候变化
source region of Yellow River
climatic feature
climatic change
