Date: August 2017
- The continuum was updated to MT_CKD_3.2, which has new self continnum
coefficients in window regions for wavenumbers greater than 2000 cm-1 and updated self
continuum temperature dependence from 1800-3500 cm-1 (E.J. Mlawer, M.J.
Alvarado, K.E. Cady-Pereira).
- Corrected TKC coeffs in the CloudOptProperties routine (David Turner, Karen Cady-Pereira)
Date: March 2017
- The continuum has been updated to MT_CKD v3.0, which included modifications
to the H2O foreign continuum from 0-600 cm-1 and the self continuum in the
microwave that resulted from an analysis of measurements taken at the ARM
RHUBC-II campaign and a re-analysis of RHUBC-I measurements. (E.J. Mlawer,
D.D. Turner, S.N. Paine, V.H. Payne)
- LNFL_v3.0 code now includes all the capabilities
of MonoLNFL. Therefore MonoLNFL is no longer distributed with MonoRTM. Users should build the
spectroscopic parameter input file (TAPE3) with LNFL instead, which is included in the download
Date: October 2015
The model for computing cloud liquid water absorption coefficients was replaced.
Prior versions used the model from Liebe, Hufford, and Manabe (1991). This
version uses a new model from Turner, Kneifel, and Cadeddu (2015). The
differences are small for temperatures above 0 deg C with frequencies
below about 60 GHz. Differences may be large at higher frequencies and very
large at lower temperatures. The new and old models now reside in a new
module in CloudOptProp.f90. Subroutine modm uses a generic interface to
obtain the cloud liquid water optical depth from one of the models in
CloudOptProp, and that interface points to the new model by default.
Several minor bugs were corrected: the CLW variable is now initialized and the spectral properties are read in
starting 25 cm-1 to the left of the first requested spectral point.
A new control parameter, IBRD, is now available. Setting IBRD to zero turns off the species specific broadening,
significantly shortening the processing time. This is a reasonable option for users working in scenarios where
these effects are small.
Date: December 2013
This release is a major update to MonoRTM_v4.2, containing significant structural and spectroscopic changes.
- Restructuring (K. Cady-Pereira, G. Uymin, A. Lipton)
- The code's spectroscopic line input structure and atmospheric profiling
code were made more consistent with LBLRTM. Line parameters are now read
from a binary TAPE3 file (as in LBLRTM) produced with MonoLNFL, which is
now included in the MonoRTM package.
- All routines except tips_2003.f are now f90.
- The code to read in and store the spectroscopic data was removed from modm
and is in a separate module: lnfl_mod.f90.
- The RT codes are also in a new module: RTMmono.f.
- Physical constants are all declared in one module, PhysConstants.f90, which
also provides routines to access the values; geophysical parameters in
another similar module, PlanetEarth.f90.
- A number of new input and output options, including optional netcdf output
with spectral layer optical depths, have been added. (K. Cady-Pereira, D.
- The capability to utilize a speed-dependent Voigt line shape has been added
using the approach of Boone et al. (2007; 2011) (M. Alvarado).
- The spectral region about line center in which the detailed Humlicek (1982)
method is used to compute the line shape has been extended to provide
greater accuracy (M. Alvarado, E. Mlawer, G. Villanueva).
- The capability to utilize available line broadening coefficients (width,
temperature dependence, pressure shift) that are specific to a given pair
of species was added (K. Cady-Pereira, E. Mlawer, M. Alvarado).
- The method to compute path lengths in the code's atmospheric module was
changed to provide greater stability for cases with exceptionally high
rates of change of refractive index with height (M. Alvarado, E. Mlawer, D.
Turner, N. Miller).
- Mixing ratio inputs are now allowed for IATM=0 (K. Cady-Pereira, J. Delamere).
- A bug related to foreign broadening of oxygen transitions was fixed (E.
Mlawer, M. Alvarado, K. Cady-Pereira).
- A bug related to the use of the continuum in MonoRTM for near-IR cases was
fixed (K. Cady-Pereira, M. Alvarado).
- The default microwave line parameter files,
spectral_lines.dat.0_55.v5.0_fast and spectral_lines.dat.0_55.v5.0_veryfast,
now have a direct correspondence to the full AER linelist, whose current
version is aer_v_3.3 (M. Alvarado, K. Cady-Pereira, E. Mlawer).
- Numerous lines were added to the default microwave line files (M. Alvarado, E. Mlawer,
K. Cady-Pereira) so that the calculational accuracy at any frequency between 0 and
899.4 GHz (0-30 cm-1) with respect to the full line list aer_v_3.3 is:
NOTE: Users who wish to run MonoRTM v5.0 in spectral regions other than the MW
should use the full AER line file (either aer_v_3.2 or aer_v_3.3),
keeping in mind that the full line file can take a long time to run.
- for spectral_lines.dat.0_55.v5.0_fast (corresponds to ISPD=0 in MonoRTM
v4.2 and older): 0.1 K for upwelling, 0.2 K for downwelling
- for spectral_lines.dat.0_55.v5.0_veryfast (corresponds to ISPD=1 in MonoRTM
v4.2 and older): 0.5 K for upwelling, 1.0 K for downwelling
- Line parameters were taken from HITRAN 2012 with the exceptions noted below.
- 60 GHz O2 lines and 120 Ghz O2 line from Tretyakov et al. (2005), as
implemented in MonoRTM v4.2.
- 0 cm-1 "Debye line" for O2 same as in MonoRTM v4.2, all other O2 lines
below 1.497951 cm-1 removed.
- The intensities for the H2O lines at 0.7417 cm-1 (22.233 GHz), 6.1145
cm-1 (183.3 GHz), 10.84 cm-1 (325 GHz) and 12.68 cm-1 (380 GHz) are based on the
work of S. A. Clough (1973) and are the same as in MonoRTM v4.2.
- The foreign widths of the 22 and 183 GHz water vapor lines were
rederived based on HITRAN 2012 line parameters using the approach of Payne et
al. (2009). The temperature dependence parameters for these lines were adjusted
from their HITRAN 2012 values to provide better agreement with calculations by
Gamache (V. Payne, B. Gamache, E. Mlawer).
- Broadening parameters were implemented for the following pairs of molecules:
- Oxygen transitions broadened by water vapor based on Drouin et al.
(2013) (E. Mlawer, K. Cady-Pereira).
- Carbon dioxide transitions broadened by water vapor based on
Sung (2009) (K. Cady-Pereira).
- Water vapor transitions broadened by carbon dioxide based on
calculations by R. Gamache of U. Mass. Lowell (K. Cady-Pereira).
- Carbon dioxide transitions broadened by carbon dioxide based on
calculations by R. Gamache of U. Mass. Lowell (K. Cady-Pereira).
- The continuum was updated to MT_CKD_2.5.
- Speed dependent parameters were implemented for CO2 transitions in the
bands 68<-1 and 71<-1 (i.e., 30012<-00001 and 30013<-00001) following Devi
et al. (2007a,b) (M. Alvarado).
An error related to the print-out of total optical depths in the MonoRTM.OUT file was corrected.
- Code is now using MT_CKD_2.4 continuum, which includes
significant updates to the self- and foreign-broadened water vapor
continuum in the
range 0 to 600 cm-1 (0 to 18 THz), based on new analyses of ARM
measurements in the
microwave and far-IR regions (Payne et al., 2011; Delamere et al., 2010).
An error related to calculations for multiple profiles was corrected.
Code has been modified to pass optical depth arrays between subroutines as arguments
in order to improve modularity of the Monochromatic Optical Depth Model (MODM)
module. In addition, the IOD option may now be used as a flag to output layer optical
depths to ascii files.
Code has been updated to allow monochromatic calculations at frequencies beyond the
microwave region. These updates include the implementation of CO2 line coupling and
the option to include cross-section molecules. Format of output files has been
modified to accommodate this change.
Calculation of the total internal partition sum has been updated to be consistent
with the calculation in LBLRTM.
MonoRTM now uses MT_CKD_2.1 continuum (previously was using CDK_2.4).
An error in the nitrogen continuum has been corrected.
The INP option has been replaced by the use of IATM=1 or IATM=0 (consistent with
LBLRTM). A stand-alone IDL program is provided to convert ARM netCDF profiles into MonoRTM input format.
directory structure has been changed to make it more consistent with LBLRTM
the 22GHz and the 183GHz water vapor lines have been updated (Payne et al, 2008)
the 325 GHz water vapor line has been updated to reflect CRB calculations by Gamache
the 380 GHz water vapor line has been updated according to measurements by Koshelev et al (2007)
corrected error in surface reflectance code
updated limb radiative transfer code
code has been updated to allow scaling of profiles
spectral line file has been modified to include new oxygen line widths and
line-coupling coefficients from Tretyakov et al (2005)
more lines in the spectral line file are now included in the fast option, to increase
accuracy at higher frequencies and lower water vapor amounts
code has been restructured and made more robust
new makefiles allow for the creation of single and double precision code on SGIs and on MacOSX
a new LBLATM module has been added, which is consistent with the LBLATM
module currently used by LBLRTM
several minor coding inconsistencies, which led to compilation errors under
some compilers, have been eliminated
O2 line coupling parameters have been modified to yield significantly better
agreement with MWRP measurements in the 50-60 GHz range
code output contains more detailed information on the current version of
the software and the spectral lines file
Atmospheric and Environmental Research