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Transcript of Earth Science
(Interior West of North America) Bora
(Northeasterly from eastern Europe to northeastern Italy Elephanta
(Strong southerly or southeasterly winds on the Malabar coast of India Sundowner
(Strong offshore wind off the California coast Santa Ana
(Southern California Sirocco
(Dry wind in northern Africa) What is Wind? Categories of Wind How are winds created? Wind is the movement of air from a region
of high pressure (cool air)
to a region of lower pressure (hot air).
These areas of high and low pressure arise
from temperature differences Horizontal temperature and atmospheric Air differences at the equator and the poles cool air is more dense than warm air, Local Winds Sea Breezes
Land Breezes Global Winds Doldrums
Polar Easterlies "Wind is Wild" What impact does the Coriolis effect have on wind? What are two factors that influence wind on a global scale? What drives the world's winds? What is held most accountable for causing wind? What is the international convergence zone? A difference in air pressure causes wind to blow but why? Blows in gust
Most common during the winter
"Dark Bora" Strength
September and October
Monsoon Santa Barbara, California
How it occurs
Often precede Santa Ana events
Jesusita Fire Strong and extremely dry
Fanning regional fires The equator receives more heat than the poles.
The result is high pressure at the polls and
low pressure at the equator.
Air moves from areas of low pressure to areas of high pressure. Pressure Gradient Force The movement of air from high pressure would be direct were it not for the earths rotation.
The path of the air curves.
Air friction throws off the Coriolis Effect.
As a result, the Coriolis Effect is more drastic in the upper atmosphere. The Coriolis Effect Trade Winds- Northeastern/Southeastern winds moving from subtropical highs toward the Intertropical Convergence Zone.
Westerlies- Southwestern/Northwestern winds moving from subtropical highs to sub polar lows.
Polar easterlies- Northeastern/Southeastern winds moving from the poles to Sub polar lows. Types of Global Winds The International Convergence Zone (ITCZ) is the equatorial low where the Trade Winds converge.
Receives large amounts of precipitation.
Very little movement- Doldrums.
The exact location of the ITCZ varies throughout the year due to earths tilt. The ITCZ Upper atmospheric winds moving 75-150 mph
Generally flow east to west.
Form between areas of varying temperature.
Polar Front Jet Stream
Subtropical Jet Stream Jet Streams Dust Devil
(Strong well-formed whirlwind) Range
Where is it found
Movie Canadian Prairies and Great Plains
"Vanishing Snow" Dry conditions
Mediterranean Sea Now, Let's answer our questions! Do you have any questions? Thank You! We hope you enjoyed our presentation. Identify the major similarities between the Sundowner wind and the Santa Ana wind. Geographically, name the two winds that effect each other and their location Dust Devil What are the two basic measurements of wind, and what tools do we use to determine this?
How do harness power from the wind, and how effective is it? Direction
Speed Wind Sock
Satellites Tools Windmills Air has mass, and when it blows, it contains the energy of that motion, or otherwise known as Kinetic Energy
Kinetic Energy - converts into mechanical force or electricity Measuring Wind