Radiative forcing - measured at Earth‘s surface - corroborate the increasing greenhouse effect R.Philpona 1 , B.Dürr 1 , C.May 1 , A.Ohmura 2 and M.Wild 2 1 Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, Davos Doerf, Switzerland 2 Institute for Atmospheric and Climate Science, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland Geophysical Research Letters, Vol.31, L03202, 2004
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Radiative forcing - measured at Earth‘s surface - corroborate the increasing greenhouse effect
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Radiative forcing - measured at Earth‘s surface - corroborate the increasing
greenhouse effect
R.Philpona1, B.Dürr 1, C.May1, A.Ohmura2 and M.Wild2
1 Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, Davos Doerf, Switzerland2 Institute for Atmospheric and Climate Science, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
Geophysical Research Letters, Vol.31, L03202, 2004
Radiative Budget of the Earth atmosphere
Detailed overview of the earth atmosphere energy balance. Left hand side the incoming solar radiation, right hand side the outgoing infrared radiation.
Present (2002) Radiative Forcing
Radiative Balance
At the top of the atmosphere, the expenditure all incident solar radiation must be accounted for the Earth as a whole, that is, the net incoming solar
radiation must be balanced by the outgoing longwave radiation.
IPCC2001 - Definition of (RT) Radiative Forcing
RT is the change in the net vertical irradiance (Wm-2) at the tropopause due to an internal change or a change in the external forcing of the climate system, such as, for example,
• a change in the concentration of carbon dioxide
• or water
• aerosols
• the output of the Sun.
Usually RT is computed after allowing for stratospheric temperatures to readjust to radiative equilibrium, but with all tropospheric properties held fixed at their unperturbed values.
Forcing |FTs| - |FT
T|
surface
tropopause
Fss Fs
T
FTTFT
s
FTs
FST FS
L
•The IPCC used the following definition, focusing on topopause level conditions:
The Alpine Surface Radiation Budget (ASRB) Network