摘要
应用1992－1996年4－9只黄河上游河曲段部分气象站逐日02、08、14、20点云量和云状，20－08点、08－20点降水资料，计算分析了4－9月黄河上游河曲地区主要降水云层、对流云和层状云的云层特征，出现频率、地理分布及其与降水的关系。结果表明，黄河上游河曲地区4－9月层状云出现频率约15％，其≥0.1mm降水率约50％，地理分布以久治为高值中心，由南向北呈递减趋势。对流云出现频率约60％，其≥0.1mm降水率约80％。并指出黄河上游地区以对流性降水为主，但降水强度小，持续时间短，夜间降水多于白天。
the paper, day-by-day cloud cover and type(02, 08, 14,20), and precipitation data(20 - 08,08- 20)of the meteorological observatories in upper reaches of Huanghe river from Apr. to Sep, 1992-1996 are employed toanalyse the major precipitation nephsystems, convective and stratus, occurrence frequency,geographic distribution and relationwith the precipitation. The result shows that, from Apr. to Sep, the occurence frequency of stratus is about 15 %, and precipitation efficiency(≥0.1mm)50%,with the high value occurring in Jiuzhi and decreasing progressively from south to north;while the occurence frequency of convective cloud is about 60%, and precipitation efficiency(≥0. 1mm)80%. It is the convective cloud to produce most of the precipitation characterized by small intensity,short duration, and much nocturnal precipi-tation.
出处
《青海科技》
1999年第1期19-24,共6页
Qinghai Science and Technology
基金
省人影办公开招标科研课题
关键词
黄河上游
云层特征
降水频率
降水量
Upper Reaches of Huanghe River Cloud Layer Character Precipitation Frequency
