4AOP main characteristics:

Items 2016 Version
2009 Version 2006 Version
Spectroscopic database GEISA 2015 GEISA 2009 GEISA 2003
H2O continuum MT CKD 3.2 Clough et al., 1989 Clough et al., 1989
N2 continuum Lafferty et al, 1996

N2/H2O broadening (Hartmann et al 2018)

Lafferty et al, 1996 Lafferty et al, 1996
O2 continuum Thibault et al,1997 Thibault et al,1997 Thibault et al,1997
Partition Function Gamache et al., 2000 Gamache et al., 2000 Gamache et al., 2000
Line coupling CO2 Lamouroux et al, 2012

CH4

  • TIR: Tran et al ????
  • R6 Merlin manifold: Delahaye et al 2018
CO2 Niro et al, 2004 CO2 Rodrigues et al, 1998
χ correction of Voigt profiles No Perrin et al, 1989 Perrin et al, 1989
pressure shift for H2O yes yes no
Spectral dependence of the surface emissivity yes yes no
Simulation of Scattering effects of aerosols yes, based on

  • DISORT
    K. Stamnes et al, 1988
  • LIDORT
  • V-LIDORT
yes, based on

  • DISORT
    K. Stamnes et al, 1988
no
Implementation of the limb viewing geometry yes no
Number of nominal layers / Top of the atmosphere 43 / 0.0026 hPa 43 / 0.0026 hPa 40 / 0.05 hPa
Adjustment of gas concentration profiles in the Atlas computations yes yes N.R.