wind and ocean currents global winds ocean currents local winds
TRANSCRIPT
Wind and Ocean Currents
Global windsOcean Currents
Local winds
Air movement • Warm air raises; Cold air sinks moving into
the void left be the warm air
• Air moves from high pressure to low pressure
Global winds
What beltAre we in?
Westerlies
Ocean Currents
• Surface Currents – In the upper 1000 m – Driven by temperature– Also know as the global ocean currents
• Density Currents – Driven by Density – More dense water sinks and where they
circulate for 500 to 2000 years
Surface Currents
• Warm Currents – Driven by Winds (temperature)– Flow away from the equator towards the poles
• Cold Currents – Driven by Winds (temperature)– Flow away from the poles towards the equator
• Counter Currents – Flow the opposite of the “wind” currents – They “Fill” in the gaps
Global ocean currents
Doldrums
• Windless zones at the equator
• Air moves vertically
• And current-less zone in the middle of the major ocean basins
• Water mover around them
Local winds
• Land Breeze • Cool air over the land • Warm air over water • Cold air slides into the
void left by the warm air rising
• Happens during nighttime
• Wind blowing from the land
• Sea breeze • Warm air over land • Cool air over water • Cold air slides into the
void left by the warm air rising
• Happens during daytime
• Wind blowing from the sea
Land Breeze
Wind
Land Breeze
Wind
Sea Breeze
Wind
Sea breeze
Wind