Rate of erosion is high in arid and semi arid areas .
Give reason
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Answers
Aridity results from the presence of dry, descending air. Therefore, aridity is found mostly in places where anticyclonic conditions are persistent, as is the case in the regions lying under the anticyclones of the subtropics.
The influence of subtropical anticyclones on rainfall increases with the presence of cool surfaces. Arid conditions also occur in the lee of major mountain ranges that disrupt the structure of cyclones passing over them, creating "rain shadow" effects. Rainfall is also hindered by the presence of greatly heated land surfaces; as a consequence, large areas of dry climate exist far from the sea.
3. Arid zone climate
The arid zone is characterized by excessive heat and inadequate, variable precipitation; however, contrasts in climate occur. In general, these climatic contrasts result from differences in temperature, the season in which rain falls, and in the degree of aridity. Three major types of climate are distinguished when describing the arid zone: the Mediterranean climate, the tropical climate and the continental climate.
In the Mediterranean climate, the rainy season is during autumn and winter. Summers are hot with no rains; winter temperatures are mild. Figure 1.1 illustrates the Mediterranean climate, with a wet season starting in October and ending in April or May, followed by 5 months of dry season.
In the tropical climate, rainfall occurs during the summer. The greater the distance from the Equator, the shorter the rainy season. Winters are long and dry. In Sennar, Sudan, an area that is typical of the tropical climate, the wet season extends from the middle of June until the end of September, followed by a dry season of almost 9 months (Figure 1.2).
In the continental climate, the rainfall is distributed evenly throughout the year, although there is a tendency toward greater summer precipitation. In Alice Springs, Australia, each monthly precipitation is less than twice the corresponding mean monthly temperature
Answer:
Aridity results from the presence of dry, descending air. Therefore, aridity is found mostly in places where anticyclonic conditions are persistent, as is the case in the regions lying under the anticyclones of the subtropics.
The influence of subtropical anticyclones on rainfall increases with the presence of cool surfaces. Arid conditions also occur in the lee of major mountain ranges that disrupt the structure of cyclones passing over them, creating "rain shadow" effects. Rainfall is also hindered by the presence of greatly heated land surfaces; as a consequence, large areas of dry climate exist far from the sea.
3. Arid zone climate
The arid zone is characterized by excessive heat and inadequate, variable precipitation; however, contrasts in climate occur. In general, these climatic contrasts result from differences in temperature, the season in which rain falls, and in the degree of aridity. Three major types of climate are distinguished when describing the arid zone: the Mediterranean climate, the tropical climate and the continental climate.
In the Mediterranean climate, the rainy season is during autumn and winter. Summers are hot with no rains; winter temperatures are mild. Figure 1.1 illustrates the Mediterranean climate, with a wet season starting in October and ending in April or May, followed by 5 months of dry season.
In the tropical climate, rainfall occurs during the summer. The greater the distance from the Equator, the shorter the rainy season. Winters are long and dry. In Sennar, Sudan, an area that is typical of the tropical climate, the wet season extends from the middle of June until the end of September, followed by a dry season of almost 9 months (Figure 1.2).
In the continental climate, the rainfall is distributed evenly throughout the year, although there is a tendency toward greater summer precipitation. In Alice Springs, Australia, each monthly precipitation is less than twice the corresponding mean monthly temperature