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Ch 24.3 Winds

Ch 24.3 Winds. Weather is the horizontal movement of air. Air always moves from H  L pressure. Temperature differences create pressure differences. Local Winds: Sea & Land Breezes.

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Ch 24.3 Winds

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  1. Ch 24.3 Winds Weather is the horizontal movement of air. Air always moves from H  L pressure. Temperature differences create pressure differences.

  2. Local Winds: Sea & Land Breezes http://www.classzone.com/books/earth_science/terc/content/visualizations/es1903/es1903page01.cfm?chapter_no=visualization

  3. Local Breezes – over short distances Ex.: Sea breezes – happen during the day because LAND Heats Up FASTER THAN WATER (water takes a long time to heat up and cool down). Local Breezes – over short distances Ex.: Land breezes – happen at night because LAND COOLS DOWN FASTER THAN WATER. Air is mostly heated by I.R. re-radiated off of surfaces. Warmer surfaces  Warmer air  Less dense (more expanded) Low Pressure Cooler surfaces Cooler air  Denser  High Pressure Wind moves from H  L pressure

  4. Local Breezes – over short distances Ex.: Land breezes – happen at night because LAND COOLS DOWN FASTER THAN WATER. Air is mostly heated by I.R. re-radiated off of surfaces. Warmer surfaces  Warmer air  Less dense (more expanded) Low Pressure Cooler surfaces Cooler air  Denser  High Pressure Wind moves from H  L pressure

  5. Warm air • More Kinetic Energy • Less Dense • Low Pressure • Rises (less dense) • Room for moisture • Cold air • Less Kinetic Energy • Denser • High Pressure • Sinks(denser) • Dry (less room for moisture)

  6. Seasonal Winds: Monsoon Winds MOONSOON RAINS are seasonal and experienced in India & S.E. Asia (subtropical locations) Summer – Land in warmer (Low Pressure) than Water (High Pressure). Air moves from water to land carrying moisture --- RAIN. It can rain 37 ft of rain in a few months. Remember … Land heats up faster than water. Winter – Land is cooler than water. Air moves from land to water – this is a DRY SEASON

  7. Global Winds GLOBAL WINDS – DUE TO DIFF. IN PRESSURE Warm air rises at the equator and cold dense air sinks at the poles. In general wind want to move from Poles  Equator, but E’s rotation CURVES the path of wind. CORIOLIS EFFECT – DUE TO EARTH’S ROTATION, CURVES THE PATH OF THE WIND. Wind & Surface Currents deflect TO THE RIGHT in the N. Hemi; TO THE LEFT in the S. Hemi. WARM AIR RISES – LOW PRESSURE COOL AIR SINKS – HIGH PRESSURE http://www.classzone.com/books/earth_science/terc/content/visualizations/es1905/es1905page01.cfm?chapter_no=visualization http://www.mhhe.com/biosci/genbio/tlw3/eBridge/Chp29/animations/ch29/global_wind_circulation.swf

  8. Global Winds: Warm Low Pressure Air (carrying moisture) Rises @ Equator and Sinks @ 30 N & S (dry, sinking, high pressure air) http://www.coolschool.ca/lor/GEO12/unit9/U09L03.htm

  9. Global Winds: There are 3 major convection cells of rising and sinking air for each hemisphere. Due to Coriolis: Air deflects to the Right in the N. Hemi. And to the Left in the S. Hemi. Remember: start at the BASE of the arrow. http://www.ukdivers.net/meteorology/coriolis.htm

  10. Winds Aloft (high in Troposphere) • JET STREAM – • Rivers of wind high in the atmosphere - above about 20,000 feet (Tropopause: Boundary of Tropo. & Stratosphere) • Also help determine the locations of areas of high and low air pressure at the Earth's surface. • Steers Weather. • Jet stream dips south … we get cold Canadian air • Jet stream slides north … warm Gulf air rides up. Jet Stream: http://www.wunderground.com/US/Region/US/pxJetStream.html

  11. http://www.pbs.org/wgbh/nova/vanished/jetstr_giving.html Current Jet Stream Animations: http://www.wunderground.com/global/Region/EU/pxJetStream.html

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