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Chapter 2. Radiation
IFS documentation Front Page
Chapter 1. Overview
Chapter 2. Radiation
Chapter 3. Turbulent diffusion and interactions with the surface
Chapter 4. Subgrid-scale orographic drag
Chapter 5. Convection
Chapter 6. Clouds and large-scale precipitation
Chapter 7. Land suface parametrization
Chapter 8. Methane oxidation
Chapter 9. Climatological data
REFERENCES
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2.1 Radiative heating
The radiative heating rate is computed as the divergence of net radiation fluxes
:
 ,
|
(2.1) |
where
is the specific heat at constant pressure of moist air
,
and
and 
are the specific heats at constant pressure of dry
air and water vapour, respectively. Sections 2.2 and 2.3 describe the computation of the longwave
and shortwave radiative fluxes respectively. The solution of the radiative
transfer equation to obtain the fluxes is unfortunately very expensive,
and we cannot afford to do it more than every 3 hours at every fourth grid
point. The interpolation scheme used for obtaining the radiative fluxes
at every grid point and every time step for the relevant instantaneous temperature
profile and solar zenith angle is described in Section 2.4.A description of the inputs, in particular the climatologically defined quantities of radiative importance is given in Section 2.5. Finally, an alphabetical list of the subroutines of the radiation scheme is given in Section 2.6.
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05.04.2002 |
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