2 main reasons which has caused decrease in the rain fall over the past few years?
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1- deforestation
2- greenhouse effect
2- greenhouse effect
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1. Pollution
2. When the land air is much hotter than the sea the sea cools the hot air blowing from the land, which increases the relative humidity of the air and this reduces evaporation from the sea. With lower evaporation less rain falls. When the colder air blows back to land it is heated by contact with hot ground and by radiation from the ground, which reduces relative humidity. When relative humidity is low air has to rise high before it is cool enough for condensation and clouds. Some places have high pressure air above them and this leads to conditions where air does not rise to cool and form clouds and rain. When there is little wind, spray from waves is not prevalent and so less evaporation of spray occurs, which can cause lower rainfall.
2. When the land air is much hotter than the sea the sea cools the hot air blowing from the land, which increases the relative humidity of the air and this reduces evaporation from the sea. With lower evaporation less rain falls. When the colder air blows back to land it is heated by contact with hot ground and by radiation from the ground, which reduces relative humidity. When relative humidity is low air has to rise high before it is cool enough for condensation and clouds. Some places have high pressure air above them and this leads to conditions where air does not rise to cool and form clouds and rain. When there is little wind, spray from waves is not prevalent and so less evaporation of spray occurs, which can cause lower rainfall.
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