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Most [[climate models]] simulate a region of the Earth's atmosphere from the surface to the [[stratopause]]. There also exist numerical models which simulate the wind, temperature and composition of the Earth's tenuous [[upper atmosphere]], from the [[mesosphere]] to the [[exosphere]], including the [[ionosphere]]. This region is affected strongly by the 11 year [[Solar_cycle]] through variations in solar UV/EUV/Xray radiation and [[solar wind]] leading to high latitude particle precipitation and [[aurora]]. It has been proposed that these phenomena may have an effect on the lower atmosphere, and should therefore be included in simulations of climate change. For this reason there has been a drive in recent years to create "whole atmosphere" models to investigate whether or not this is the case.
'''Upper Atmospheric Models''' are a type of [[Climate models|climate model]] which simulate a region of the Earth's atmosphere above the
[[stratosphere]]. There also exist numerical models which simulate the wind, temperature and composition of the Earth's tenuous [[upper atmosphere]], from the [[mesosphere]] to the [[exosphere]], including the [[ionosphere]]. This region is affected strongly by the 11 year [[Solar_cycle]] through variations in solar UV/EUV/Xray radiation and [[solar wind]] leading to high latitude particle precipitation and [[aurora]]. It has been proposed that these phenomena may have an effect on the lower atmosphere, and should therefore be included in simulations of climate change. For this reason there has been a drive in recent years to create "whole atmosphere" models to investigate whether or not this is the case.


== External links ==
== External links ==
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* [http://waccm.acd.ucar.edu/ WACCM (0 - ~450km) ]
* [http://waccm.acd.ucar.edu/ WACCM (0 - ~450km) ]




{{climate-stub}}
{{climate-stub}}

Revision as of 01:49, 31 July 2006

Most climate models simulate a region of the Earth's atmosphere from the surface to the stratopause. There also exist numerical models which simulate the wind, temperature and composition of the Earth's tenuous upper atmosphere, from the mesosphere to the exosphere, including the ionosphere. This region is affected strongly by the 11 year Solar_cycle through variations in solar UV/EUV/Xray radiation and solar wind leading to high latitude particle precipitation and aurora. It has been proposed that these phenomena may have an effect on the lower atmosphere, and should therefore be included in simulations of climate change. For this reason there has been a drive in recent years to create "whole atmosphere" models to investigate whether or not this is the case.

Two examples of upper atmospheric models are :

An example of a whole atmosphere model is :