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通常的城市污染对相对湿度的影响吗?

我注意到,在相对湿度较低的农村地区污染不断低于高污染城市的湿度。有污染和湿度的相关性吗?

回答

相对湿度,而一个不错的方式来衡量空气可能会觉得(安慰),是一个贫穷的措施比较不同时间在白天。你注意观察:>每天早上我们这里有90 - 100%相对湿度(在城市里),减少60 - 80%在当天晚些时候。这仅仅是一个昼夜的温度变化的影响。相对湿度的比例是空气中水蒸气的实际数量比所需的水蒸气饱和空气。所需的水蒸气饱和空气温度的函数。热空气需要更多的水蒸气饱和比寒冷的空气。如果你有空气以一个恒定的质量之间的水蒸气和不同温度冷(例如7点)和温暖(如下午)你会有相同的模式的相对湿度观测到,早上非常高,减少白天。这是一个正常模式和没有任何影响湿润或干燥的空气每天你会观察这个模式在许多地方相对湿度。>现在例如星期二上午七点半,在布加勒斯特温度是2度,相对湿度93%。在国家的房子(90公里),温度是0 c和45%相对湿度。 Air at 2 C and 93% RH has a vapor pressure around 6.5 hPa and air at 0 C and 45% RH has a vapor pressure around 2.8 hPa. This means the air in Bucuresti has a little more than twice the water content of the air from your rural location. The other answer by Fred gives some good reasons how this can arise. A few other reasons can be the large scale wind motions and where your rural location happens to be. Bucuresti can often be in westerly winds where some moistening occurs from flow over the Danube and further moistening within Bucuresti from rivers and lakes. As Fred noted, urban areas tend to be warmer than rural areas so there is more capacity to hold water vapor (before saturation is reached). You don't mention where your rural home is, but if it happens to be to the north or north west (e.g. Ploiesti, Pitesti, Buzau) then you have orographic effects from the Carpathian mountains that can dry out the air. If flow is up and over the mountains then the air is cooled as it flows upslope (on the Transylvanian side) where it becomes cloudy and can precipitate. This reduces the amount of water vapor in the air and as it flows downslope and warms it remains dryer. I could give a more specific large scale flow explanation given the location of the rural house.

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