乌鲁木齐市近40年相对湿度气候特征分析

Climate Characteristics Analysis of Relative Humidity in Urumqi in Recent 40 Years

利用乌鲁木齐市1961～2000年逐日平均相对湿度资料,分析了乌鲁木齐市近40年相对湿度的基本气候特征、变化趋势等。结果表明,乌鲁木齐市年平均相对湿度为57.5%。一年四季中冬季的相对湿度最大,为77.5%,夏季最小,为41.2%。春、夏、秋、冬季以及年相对湿度均呈增加趋势。逐年平均相对湿度存在以2年、3～4年和准7年为主的周期,其中准7年周期振荡最为强烈。

Using the day-to-day average relative humidity in Urumqi from 1961 to 2000,the climate characteristics,variation and change trend of relative humidity in Urumqi in 40 years were analyzed.The main results showed that the year average relative humidity in Urumqi was 57.5%.The average relative humidity in winter was 77.5%,the highest season in a year,while the average relative humidity in summer was 41.2%,the smallest season.The relative humidity in spring,summer,autumn,winter,and a year all increased in recent 40 years.The prominent periods of annual mean relative humidity are 2 years,3-4 years and quasi-7 years.The oscillation of quasi-7 years period was the strongest.