Wind Part 1: How do we measure it? Part 2: What exactly is wind? - - PowerPoint PPT Presentation

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Wind Part 1: How do we measure it? Part 2: What exactly is wind? - - PowerPoint PPT Presentation

Nov 26, 2022 226 likes •430 views

Wind Part 1: How do we measure it? Part 2: What exactly is wind? Part 3: Where is it? PART 1: Wind speed = Measuring anemometer Wind Wind direction = wind vane given from the direction it came FROM. Wind chill = increased

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SLIDE 1

Wind

Part 1: How do we measure it? Part 2: What exactly is wind? Part 3: Where is it?

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SLIDE 2

PART 1: Measuring Wind

  • Wind speed =

anemometer

  • Wind direction =

wind vane –given from the direction it came FROM.

  • Wind chill = increased

cooling (wind removes heat from you)

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WIND VANE

  • Points into the wind
  • Winds are named by where they come

FROM

  • A WESTERLY wind is coming FROM the

West.

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Which way is the wind blowing TOWARDS? Where is it blowing FROM?

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Part 2: What exactly is wind?

  • air is a “fluid” so it acts like water
  • It moves from HIGH pressure to

LOW pressure.

  • When air moves it is called wind
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Remember what causes wind?

  • When cold high pressure air is next to hot

low pressure air so it moves to equalize

HIGH Pressure

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Different places on Earth heat differently which makes the wind blow

  • Wind blows from the poles

to the equator

  • Water can cause winds
  • Cities/Forests can cause

winds

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Wind blows from poles to equator

Hot air rises at equator and cold air sinks at poles High pressure rushes to equalize Low pressure

HIGH

Pressure LOW Pressure

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Heating Earth’s Surface

Water can cause winds:

  • It takes longer for water to

heat up in the day

  • It takes longer for water to

cool off at night too. THIS MAKES WIND

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Day: land heats up first and hot air rises Night: land cools off first and cold air sinks

Which one is night and which is day?

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SEA BREEZE

  • Hot air rises and cold air sinks

causing it to circulate and the wind blows: convection

  • Day breeze goes inland
  • Night breeze goes offshore
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Hotter = Low pressure Cooler = High pressure

CITIES & FORESTS can cause winds

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Part 3: Where is all the wind?

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WINDS are anywhere a High pressure area is next to a low pressure area

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On Earth the winds blow from pole (high P) to equator (low P)

  • But the Earth

spins and it messes everything up!

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The Coriolis Effect

  • If Earth did not rotate, global

winds would blow in a straight line from the poles toward the equator.

  • The way the Earth’s rotation

makes winds curve is called the Coriolis Effect.

  • http://daphne.palomar.edu/pdeen/Animation

s/34_Coriolis.swf

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Global Winds: large scale winds

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Global Convection Currents

  • What causes

global winds? –Convection in the atmosphere –air going towards the equator –coriolis effect

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Global Wind Belts

  • Doldrums
  • Horse

Latitudes

  • Trade

Winds

  • Westerlies
  • Polar

Easterlies