Introduction

This repository contains code for the AER continuum used in LBLRTM and as a standalone model, MT_CKD. MT_CKD is an enhancement ot the original CKD model

LBLRTM uses the line parameters and MT_CKD continuum in its calculations. The models and data are thus linked. For the latest release, the relationships are:

LBLRTM Release	MT_CKD Release	Line File
v12.17	4.3	v3.8.1

If any build or run issues occur, please create an issue or contact the AER-RC Group.

Cloning the Latest Release

Assuming the output directory should be MT_CKD:

git clone --recursive [email protected]:AER-RC/MT_CKD.git

--recursive is important, because this repository is linked with our common FORTRAN modules repository that are required in the model builds. Because LBLRTM uses the continuum, it, too, is also added as a submodule and a couple of its source files link to the LBLRTM submodule (contnm.f90, lblparams.f90, phys_consts.f90, and planet_earth.f90). If this keyword is forgotten, one can do:

git submodule init
git submodule update

in the MT_CKD directory.

Currently, the latest release is MT_CKD_4.3, and it is recommended that this be the version that users clone and checkout (rather than the master branch). To do this, one needs to simply checkout the 4.3 tag:

git checkout tags/4.3

Instead of cloning, users can also download an MT_CKD tarball and unpack it:

tar xvf cntnm_4.3.tar.gz
mv MT_CKD-4.3 cntnm

Though not necessary, the move to cntnm is for consistency with previous release packages and the associated documentation.

Building

To build the continuum model:

cd MT_CKD/build
make -f make_cntnm $TARGET

The TARGET environment variable depends on the user's operating system, compiler, and desired precision. Available targets are:

Target	Description	Compiler
aixIBMsgl	IBM/AIX OS using IBM fortran,single precision	xlf90
linuxPGIsgl	Linux OS using PGI fortran,single precision	pgf90
linuxGNUsgl	Linux OS using GNU fortran,single precision	gfortran
linuxG95sgl	Linux OS using G95 fortran,single precision	g95
inuxINTELsgl	Linux OS using Intel fortran,single precision	ifort
mingwGNUsgl	Windows unix shell environment using gfortran,single precision	gfortran
osxABSOFTsgl	Mac OS_X using Absoft Pro fortran,singleprecision	f90
osxGNUsgl	Mac OS_X using GNU fortran,singleprecision	gfortran
osxIBMsgl	Mac OS_X using IBM XL fortran,singleprecision	xlf90
osxINTELsgl	Mac OS_X using Intel fortran,single precision	ifort
sunSUNsgl	Sun/Solaris OS using Sun fortran,single precision	sunf90
sgiMIPSsgl	SGI/IRIX64 OS using MIPS fortran,single precision	f90

Run Example

To run MT_CKD as a standalone program instead of in LBLRTM:

cd run_example/
ln -s ../cntnm_v4.3_linux_pgi_dbl cntnm # assuming v4.3 was built with PGI in double precision (linuxPGIdbl)
./cntnm (0, enter)

Push 0, then enter, and CNTNM.OPTDPT and WATER.COEF will be written to working directory. These can be compared with CNTNM.OPTDPT_mt_ckd_AER and WATER.COEF_mt_ckd_AER, which are included in version control and are considered the baseline calculations. They change with every release and will be updated accordingly.

For other runs of the continuum standalone program, the user can edit INPUT.example in the run_example directory.