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Water Temperature vs. Land TemperatureLand warms (gains heat) much
faster than a body of waterLand cools (loses heat) much faster
than a body of water
This uneven heating of Earth’s surface causes wind
Water TemperatureOceans cover more than 2/3 of Earth’s surface, thus it absorbs more sunlight and stores more heat
Land TemperatureLand is made of many materials which absorb the sun’s rays differently
Differences in air temperatureWhen you have differences in air temperature,
hot air will rise (it’s less dense) and cold air will sink (it’s more dense).
Hotter air has lower air pressureCold air has higher air pressure
Higher air pressure will flow into areas of lower air pressure which creates winds.
Local WindsSea Breeze- Happens during the day. Cool air above the ocean or sea moves towards the warm air above the land. The cool air above the ocean has a higher pressure and the warm air above the land has a lower pressure. Air always move from an area of high pressure to low pressure, creating the wind.
Local WindsLand Breeze- Happens during the night. Cool air from the land moves towards the warm air above the ocean. The cool air above the land has a higher pressure and the warm air above the ocean has a lower pressure. Air always move from an area of high pressure to low pressure, creating the wind.
Global WindsThe sun’s rays does not hit the surface of
the Earth equally. The Equator receives more direct rays, therefore it is warmer. The poles receive indirect rays, therefore it’s colder. The Poles have colder air and high pressure. The equator has warmer air and low pressure. The air moves from the high pressure area to the low pressure creating global winds. The movement of the winds around the globe is called: GLOBAL CONVECTION CURRENTS
LowPressureHigh Pressure
MoreDense LessDense
Cool Air Warm air
Type of Pressure
Amount of Density
Amount of Water Vapor
Less water vapor
More water vapor
Cool Air Warm air
Type of Pressure
High Pressure
Low Pressure
Amount of Density
More Dense Less Dense
Amount of Water Vapor
Less water vapor
More water vapor
Warm Cool
Cool Warm
Low pressure Highpressure
High pressure Lowpressure
Sea Breeze Land Breeze
Temperature of Air Above the Land
Temperature of Air Above the Sea
Type of Pressure Above the Land
Type of Pressure Above the Sea
Time of Day Day Night
Sea Breeze Land Breeze
Temperature of Air Above the Land Warm Cool
Temperature of Air Above the Sea Cool Warm
Type of Pressure Above the Land Low pressure High pressure
Type of Pressure Above the Sea High pressure Low pressure
Time of Day Day Night