Global wind patterns

wind patterns

1. Global wind patterns By : Renu R ajbahak Neha A dhikari

2. Contents Wind Formation of wind Coriolis effect Types of winds: Global and Local wind Prevailing wind Location of Nepal

3. Wind relates to air Air is the combination of all the gases – that surrouds the earth atmosphere- -like carbon dioxide, argon, oxygen, nitrogen, hydrogen and many more The movement of Air from place to place, typically from a high-pressure area to a low-pressure area i.e , wind Winds behave differently in many different places and conditions around the earth. A 'wind' is simply the flow of a huge amount of air, usually from a  high pressure-area  to a  low-pressure area.  Fig: layers of atmosphere Fig: pressure and wind direction

4. Formation of wind Begins with sun’s radiation- absorbed differently on the earth’s surface and heated differently – Due to cloud cover, water bodies, vegetation, uneven surface like mountains, valleys Variation of temperature on earth surfaces Air on surfaces with higher temperatures  -begin to rise - it is lighter, - creates low atmospheric pressure Air on surfaces with cooler temperatures sink  - sinking creates higher atmospheric pressure. Fig: formation of wind

5. Formation of wind The behaviour when warm gases or liquids moving upward and being replaced by cooler particles is called  Convection . The energy moving during convection is called  convectional current . Convection occurs in liquids and gases – land breeze and sea breeze Sea breeze occurs at day time where as land breeze at night time Fig: formation of wind Sea breeze Land breeze

6. Coriolis effect Wind appears to curve due to earth’s rotation Northern hemisphere- wind curves to the right Southern hemisphere- wind curve to the right

7. Pressure belt

8. Types of winds Different classified winds like gentle breeze, moderate winds, strong winds gale winds( end up as tornadoes and  hurricane) Types are: Local wind and Global wind Local wind- created as a result of scenery such as mountains, vegetation, water bodies and so on- ex:sea breezes and land breezes, and mountain and valley breezes. Slope wind

9. Types of winds Global wind - large air masses - created mainly as a result of the earth’s rotation, the shape of the earth and the sun’s heating power .  Types – Polar easterlies Prevailing westerlies Tropical easterlies/ trade winds Doldrums

10. Types of winds Polar easterlies- covers from 60 ° latitudes to the north and south poles- wind blows from east to west Prevailing westerlies- covers 30° to 60° latitude to the north and south - wind blows opposite direction from west to east-Horse lati tudes:Where the Westerlies meet the trade winds at about 30 degrees (Jacksonville, Florida) is the  Horse latitudes , also Variables of Cancer, Subtropical High, or  Subtropical ridge . This is a region of high pressure, dry air, and variable winds, and is associated with deserts over land. Trade wind- covers 0 ° to 30 ° latitude- wind blows from east to west Doldrums - 0° to 5° latitude to the north and south of equatorial area- very low pressure area caused by constant heating of the sun – calm area with very little wind

11. Prevailing winds Prevailing winds are the directions that wind typically come from a location Distribute large amounts of solar energy across the world Cause variety of precipitation like rain or snow

12. Location of nepal The main  latitude and longitude of Nepal  is 28° North and 84° East . small Asian country falls within the Tropic of Cancer and the Arctic Circle. The climatic condition of Nepal is not typically a temperate one as the country is located at the foothills of the Himalayas.

13. conclusion Hot/moist air rises up and cool/dry air sinks down Low pressure due to hot air High pressure due to cool air Coriolis –curve wind due to earth’s rotation Types local and global wind

14. http:// people.senecac.on.ca/kathy.kells/TGL200BB/Intro/winds.html Eschooltoday , 2010 http :// www.eschooltoday.com/winds/the-coriolis-effect.html https://quizlet.com/22270365/jet-streamsglobal-winds-flash-cards / https://quizlet.com/22270365/jet-streamsglobal-winds-flash-cards /

15. Thank you!