- Calculate Curtis-Godson parameters
for plane-parallel atmosphere
using height spacing (from
*HGT profile) to infer
g.M (gravity x molecular mass of air) in converting VMR to absorber amount
(basically allow unhydrostatic atmospheres — I'm aware that the
name of the flag is misleading!)
- Create Curtis-Godson parameters for plane-parallel atmosphere using
only pressure level information, with GRAVTY and WGTAIR from
phyadj_dat.f90 (ie assuming hydrostatic equilibrium).
- Requires either
ZEN flags to be enabled.
- For plane-parallel atmospheres
or ZEN flags),
the Curtis-Godson equivalent p,T and partial pressure for
each path can be expressed as explicit functions of the profile values
(see notes at the top of module vrtsum_sub.f90).
However to calculate
the absorber amount in each layer requires a factor g.M
where g=gravity, M=molar weight of air.
- The RFM default is to use internal values of
g=GRAVTY and M=WGTAIR
(see *PHY for how to
adjust these from their default values),
the plane parallel atmosphere calculations completely independent of
the altitude grid
- With the HYD flag the internal values
GRAVTY and WGTAIR are ignored and the product g.M
is inferred from the altitude grid spacing assuming hydrostatic equilibrium.
- None reported