Lecture 4 Notes
Lecture 4 Notes Geo 002
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This 1 page Class Notes was uploaded by Linda Tan on Tuesday February 16, 2016. The Class Notes belongs to Geo 002 at University of California Riverside taught by Prof. Tim Lyons in Winter 2016. Since its upload, it has received 37 views. For similar materials see Earth's Climate Through Time in Geology at University of California Riverside.
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Date Created: 02/16/16
Geo 2 Lecture 4 Notes The Atmospheric Circulation System The driving force of atmospheric circulation is differential heating Axial tilt is the reason for seasons, atmospheric circulation and the shift of the ITCZ. Air Movement Vertical-Warm air is less dense and will rise (positive bouancy) until it meets air of the same density (neutral bouancy). If the air cools, it becomes dense and will sink (negative bouancy) Horizontal-Differences in atmospheric pressure causes air to move horizontally from regions of low-density warmer air until the two pressures are equalized. The force is called the pressure gradient force. Convection Cells: The rotation of the earth causes the formation of 6 atmospheric convection cells. Hadley cells- the cells immediately north and south of the equator. Convergent cells that bring warm moist air to the equator. Formation of ITCZ. Middle colls and Hadley cells diverge and create deserts because they move moisture from 30 latitude to the equator. The formation of deserts are also caused by the rain shadow effect. Clouds bringing moisture across a mountain range lose moisture as it rises above the mountain and once it reaches the other side, it has precipitated all of its excess moisture. Coriolis Effect: Because of the rotation of the earth, objects in the northern hemisphere are deflected to the right and objects in the southern hemisphere are deflected to the left.
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