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oceans and weather

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by

Natosha Daniels

on 5 March 2013

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Transcript of oceans and weather

What is this?
Barometer-measures changes in atmospheric pressure.
The best barometer is YOU! Just look outside.
If it’s clear, the pressure is high.
If it’s very cloudy or raining, the pressure is low.
If there are high, thin clouds (cirrus, or commas in the sky), the pressure will change in the next 24 hours.
What is this?
Anemometer-measures wind speed
What causes wind?
Uneven heating of the earth caused by the tilt of the earth.
Cold air is more dense than warm air
Convection Currents
Ocean Currents
http://oceanservice.noaa.gov/education/pd/oceans_weather_climate/media/ocean_and_wind_currents.swf
http://geology.wwu.edu/dept/faculty/hirschd/courses/2011/fall/101/lectures/media/Lecture25/OceanCirc.swf
El Nino
winds that usually blow west across the tropical Pacific Ocean get weaker.
Without the wind, seawater at the ocean surface isn’t pushed west towards Australia.
This causes the warm water of the western Pacific to spread east towards South America
This causes drought in some areas of the world (like Austrailia)
And flooding in other parts of the world (like Ecuador)
La Nina
During La Niña the winds grow stronger across the Pacific because the low pressure over the western Pacific and the high pressure over the central and eastern Pacific both get larger.
This causes more upwelling of ocean water in the eastern Pacific.
Both phenomenons cause drought, hurricaines, and other catastrophic weather events.
The water at the ocean surface is moved primarily by
winds
that blow in certain patterns because of the Earth’s spin and the
Coriolis Effect
. Winds are able to move the top 400 meters of the ocean creating
surface ocean currents.
Surface ocean currents can be very
large
. The
Gulf
Stream, a surface current in the North Atlantic, carries 4500 times more water than the Mississippi River
Surface ocean currents carry
heat
from place to place in the Earth system. This affects
regional climates
.

The Sun warms water at the
equator
more than it does at the high latitude
polar
regions. The heat travels in
surface
currents to higher latitudes.

A current that brings
warmth
into a high latitude region will make that region’s climate
less chilly.
On a global scale, water moves each day with the
tides
.

Over a long time it moves around the world from the
shallow
to
deep
oceans because of changes in the water’s
density
Ocean Currents
Brain Break
Parts of a Hurricane
Forming a Hurricane
http://www.knowitall.org/nasa/flash/weather/hurricanebasics.swf
Hurricanes
Oceans and Hurricanes
N. Folarin 2011
Hurricanes need four conditions to form:
low air pressure
warm temperatures
moist ocean air
tropical winds (near the equator).



Hurricanes are slowed by:
Travels over land
Travels over cold water
Loses its energy source (warm water).
http://esminfo.prenhall.com/science/geoanimations/animations/26_NinoNina.swf
copy currents on the map in your journals!!!
copy this so you can complete your homework!!!
Full transcript