中国西南地区地面平均相对湿度变化分析

The Changes of the Average Relative Humidity in Southwest China

本文利用1966-2013年中国地面气候资料月值数据集中的相对湿度数据,采用线性拟合、Mann-Kendall检验和小波分析等方法对中国西南地区的相对湿度变化特征进行了分析。结果显示西南地区年平均相对湿度值为66.44%,其中1966-2000年其值呈微弱上升态势,2000-2013年下降较快,从68%降至62%。年均相对湿度年际变化的突变检验可知在1990-2000年增长较快,在2007年发生突变;小波分析显示其存在约为3a和7a的短周期,以及约24a的长周期。月平均相对湿度的年内变化呈＂单峰单谷＂型,谷值57.62%出现在3月,峰值74.82%出现在9月。进入新世纪以来,年均相对湿度快速下降至62%,非常接近61.8%的人体最佳舒适程度,表明该地区居民可获得更好的舒适感,气候宜居条件变好。

Relative humidity is an important factor on on human health and animal and plant growth. In this study,the average relative humidity in southwest China is analyzed during the period 1966 - 2013. The following conclusions are obtained：The average relative humidity of 48 years in southwest of China is 66. 44%,and had a weak increasing trend during 1966-2000,after that an obviously decreasing trend was showing,from 68% to 62%. Mann-Kendall test shows that the interannual variation of annual mean relative humidity in 1990 - 2000 was rapid growth,the mutation occurred in 2007. Wavelet analysis shows that the interannual variation of annual mean relative humidity has about the periodic variation of short period of 3a,7a,and 24 a in southwest mountains. The type of monthly average relative humidity changes is ＂ single peak and single valley＂,where the valley value is 57. 62% in the March,the peak value is 74. 82% in September. From the new century,the average annual relative humidity decreased rapidly to approximately 62%,which is very close to the 61. 8% of the best comfort value for human.