What causes seasonal changes in pressure over land and water?
differential heat capacity of land and water
Seasonal changes in pressure over land and water are mainly caused by differences in heating and cooling rates between these two surface types. During the summer months, land surfaces heat up more quickly and to higher temperatures than water surfaces. This causes air above the land to rise, resulting in lower pressure over land and higher pressure over water. As a result, moist air from the ocean is drawn over the land, causing afternoon thunderstorms and rainfall.
During winter, the opposite effect takes place. Land cools more quickly and to lower temperatures than water, causing air to sink and high pressure to develop over land. This creates stable and dry air masses which prevent the formation of clouds and precipitation.
Additionally, regional geography can also play a role in the seasonal changes in pressure. For example, the presence of mountain ranges can cause localized heating and cooling effects that can influence the development of pressure systems. As air is forced to rise over mountains, it cools and condenses, leading to precipitation on the windward side.
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