NEMESIS Radiative Transfer and Retrieval Tool
NEMESIS is a general-purpose radiative transfer and retrieval code, designed to be applicable
to any planetary atmosphere (solar system and exoplanets) and can handle a wide range of
The NEMESIS code actually has two
components, the NEMESIS
retrieval tool itself
and also the more general radiative transfer code, RADTRAN
, from which it was developed.
The Nemesis project is a collaborative effort and is continually being developed and extended. It is
managed with Github and the repository can be found here
NEMESIS also has its own dedicated website
Scientists interested in running either NEMESIS
to analyse their
data are very welcome to contact me.
on-linear optimal E
stimator for M
) is the general purpose correlated-k/LBL retrieval code developed from the
project. The original version, developed in 2003 and used for analysing Cassini/CIRS observations of
Jupiter, Saturn and Titan, was based on the correlated-k approximation. However, NEMESIS
now also now works in
line-by-line (LBL) mode. It has been designed to be generally applicable to any planet and with
any observing mode and so is suitable for both solar-system studies and also exoplanetary studies.
is a general purpose planetary radiative transfer model for computing
the transmission of atmospheric paths and/or the radiances emitted by
planetary atmospheres. The code is general purpose and not hard-wired to any
specific planet. RADTRAN
evolved from Genlbl
, which was a general purpose
planetary line-by-line model, developed by Dr Simon Calcutt. RADTRAN
the functionality of this program to also allow the computation of planetary
spectra using both band model approximations and also the correlated-k
approximation. The code has also been extended to incorporate both multiple
scattering and single scattering calculations.
Irwin, P.G.J., N.A. Teanby, R. de Kok, L.N. Fletcher, C.J.A. Howett,
C.C.C. Tsang, C.F. Wilson, S.B. Calcutt, C.A. Nixon, P.D. Parrish,
The NEMESIS planetary atmosphere radiative transfer and retrieval tool,
J. Quant. Spectrosc. and Rad. Trans., 109, 1136-1150, 2008.
Irwin, P. G. J., S. B. Calcutt and F. W. Taylor, Radiative transfer models
for Galileo NIMS studies of the atmosphere of Jupiter. Adv. Space. Res. 19,
No. 8, pp 1149-1158, 1997.