GY_101_missed2

GY_101_missed2 - GY 101 Notes Wind Basics-Wind...

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GY 101 Notes Wind Basics: -Wind is “atmosphere in motion” Mostly horizontal movement of air Results from PGF If PGF was the only factor influencing wind, winds would blow parallel to the PGF, but are deflected by Coriolis Effect -Winds blow at different scales: GLOBAL PREVAILING SURFACE WINDS: NE Trade winds, SE Trade winds, Westerlies, Polar Easterlies LOCAL AND REGIONAL SURFACE WINDS: sea (lake) breezes, land breezes, valley breezes, mountain breezes, Chinook winds, Santa Ana winds, Asiatic monsoon. -Anemometers used to measure wind speed-from Greek “anemos” meaning “wind” -Wind vanes and windsocks used to measure wind direction -Wind direction is always stated as the direction from which the winds originate or “from whence they come” Westerlies blow from west to east in the midlatitudes Northeast Trade winds blow from NE toward SW in the tropics in NH Sea breezes blow from sea toward the land along coasts Global Prevailing Surface Winds -Surface winds that result from global circulation patterns -“Prevailing” winds -Surface winds, not geostrophic winds Geostrophic winds: winds that blow above the Earth’s friction layer, such as jet streams Idealized Model of Global Surface Wind Belts: -3 Major surface wind belts in each hemisphere: 1. Trade Winds 2. Westerlies 3. Polar Easterlies Trade Winds -NE Trades in NH Blow from NE to SW -SE Trades in SH Blow from SE to NW -Dominant prevailing wind in the tropics (10*-25* N and S) -Very steady, consistent winds -Originate in the Subtropical Highs
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