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deserts_pespr13 - Review of Earths weather regimes...

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Review of Earth’s weather regimes
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Sub-­૒tropical Deserts: occur at 20 to 30 N la?tude; African deserts bracket the equator; Sahara and Arabian to the north; Namib and Kalahari to the south
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Sub-­૒ tropical Deserts Temperate Deserts & Grasslands
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Coastal Deserts Cool air over cold ocean water holds little moisture. This air absorbs moisture when it interacts with land. The Atacama Desert (Peru) is one of the driest place on Earth.
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Interior Deserts Air loses moisture as it crosses continents. Land far from ocean moisture can be very dry. The Gobi Desert in Mongolia is a prime example.
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Polar Deserts Above 66 N and S latitudes there is little air moisture. Air circulation carries dry air to polar regions. It is so cold; the air can t hold moisture.
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Desert Life Surface processes help characterize desert landscapes. – Erosion by water and wind – Chemical weathering – Soil formation – Sedimentation These processes result in unique ecosystems.
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