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Meteorology - Heat Transfer

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by

A. Nere

on 30 November 2014

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Transcript of Meteorology - Heat Transfer

Meteorology - Heat Tranfer
Three Forms of Energy Transfer
Convection
Convection is the most influential heat source for our planet:
Convection in the atmsphere is a major cause of weather
Convection in the oceans is a major cause deep water currents
Convection in Earth's mantle causes plate tectonics
Heat travels from the sun to the surface of the Earth through
radiation
Those are the basics....let's get a little more complex
Heating Different Earth Surfaces
Weather: day-to-day changes in Earth's atmosphere
Climate: Typical weather patterns for a given location over many years
Weather and climate are created by the energy transfer between the sun, Earth's surface, and Earth's Atmosphere
Energy Transfer - the movement of energy between systems
*Day-to-day weather is more difficult to predict than long term climate
Radiation
Conduction
Convection
Radiation is the transfer of heat through waves. This type of transfer does not need a medium (matter). It can travel through a vacuum (space).
Conduction is the transfer of heat directly from molecule to molecule. The molecules need to be touching.
Convection is the transfer of heat through a fluid due to differences in density. Warm less dense fluid rises to a surface, disperses, then sinks creating circular currents
***Convection in the atmosphere is a major cause of weather and the major mechinism of energy transfer in the oceans, atmosphere, and Earth's interior
To get convection you need a heat source and a fluid
Radiation, conduction, and convection in the atmosphere
The heated ground then transfers energy to the lower atmosphere through
conduction
The heated air then begins to rise, starting a convection current to circulate the heat through the atmosphere
The amount of energy absorbed by they surface of Earth is unequal and is affect by insolation and surface material
Earth Surface Materials: Land cover
Land absorbs energy quickly but also loses energy quickly
Lighter land colors reflect more heat
Darker land colors absorb more heat
Earth Surface Material: Ocean
Oceans absorb heat slowly but also release heat slowly
Oceans store heat, and ocean currents drive weather and regulate climate
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