全球气候变化下的半干旱区相对湿度变化研究

Study on change of relative humidity in semiarid region under global climate change

为揭示全球气候变化下半干旱区空气相对湿度的变化规律,利用线性回归分析、多元线性相关分析以及M-K检验法对吉林省西部5个站点的1953年以来的相对湿度、气温、降水和风速资料进行了研究.结果表明:相对湿度的年变化曲线呈双峰型,相对湿度的最大值出现在8月,次大值出现在1月,最小值出现在4月,次小值出现在10月.夏、秋季的相对湿度较大,而春、冬季的相对湿度较小.近50年,年平均相对湿度及春、夏、秋、冬四季的相对湿度在波动中下降,下降趋势不显著;但是9月和10月的平均相对湿度下降显著.影响相对湿度变化的主要因子是温度和降水,风速也起一定的作用.相对湿度的变化与温度和风速变化呈负相关关系,与降水变化呈正相关关系.

To reveal the semiarid regions of the air relative humidity changes under global climate change, linear regression analysis, multiple linear correlation analysis, and the Mann-Kendall test are used to study on the relative humidity, temperature, precipitation and wind speed data of the five sites in the western Jilin Province from 1953 to 2002. The results show that： the past 50 years, change trend of the annual average and seasonal relative humidity is fluctuant decreasing, and it is not signifi- cant; however, in September and October, change trend of the average relative humidity is significant decreasing. The changes of the relative humidity is the double-peak curve type in a year, the maxi- mum relative humidity is in the August, the second largest relative humidity is in the January, the minimum appears in the April, and the smaller one is in October. The relative humidity of the summer and autumn is higher, but the relative humidity of the spring and winter is smaller. Changes of the temperature and precipitation are the main factor to relative humidity change, and the wind speed also plays certain role. Changes of temperature and wind speed are positive correlated with relative humidity change and change of precipitation is negative correlated with relative humidity change.