以大气RH(相对湿度)为基准对上海2005-2009年大气质量和气象资料的日均观测资料进行了分类统计,分析了RH与ρ( PM10)、大气能见度的相关关系.结果表明:在将RH以5％的间隔进行分段后,各区段ρ(PM10)平均值与RH平均值呈显著线性负相关,R(相关系数)达0.97;随着RH增大,大气能见度随ρ(PM10)变化率的绝对值增大；RH在75％以上时,增加相同的ρ( PM10)所导致的大气能见度下降量是RH在40％～45％时的5倍以上；RH小于75％时,大气能见度可较好地反映ρ(PM10)的变化,丽RH大于75％时,大气能见度的降低主要反映PM10含水量的快速增加丽并不指示ρ(PM10)的增加.%The relationships among relative humidity, PM10 mass concentration and atmospheric visibility were investigated using reorganized daily air quality and meteorological data for Shanghai during 2005-2009. When the data were sorted and averaged over 5% intervals of relative humidity, a strong negative correlation (R =0.97) was found between FM10 concentration and relative humidity. It was found that the rate of change of visibility versus PM10 increased with increasing relative humidity. With relative humidity above 75% , the visibility degradation caused by the increase of a certain amount of PM10 was five times higher than that at 40%-45% relative humidity. When the relative humidity was below 75% , the expected negative correlation was found between visibility and PM10 concentration. However, when the relative humidity was higher than 75% , visibility degradation mainly indicated the rapid increase of water uptake by the particles, which may not be a real indication of the increase in PM10 concentration.
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