C++/CUDA implementation of RTE+RRTMGP including ray tracer.

This is a C++ implementation (including a Monte Carlo ray tracer) of the Radiative Transfer for Energetics (RTE) and Rapid Radiative Transfer Model for GCM applications Parallel (RRTMGP).

The original code is found at https://github.com/earth-system-radiation/rte-rrtmgp.

Contacts: Robert Pincus and Eli Mlawer email: [email protected]

This C++ implementation can be downloaded from https://github.com/earth-system-radiation/rte-rrtmgp-cpp

Contacts: Chiel van Heerwaarden and Menno Veerman

email: [email protected] (questions on the C++ implementation)

email: [email protected] (questions on the ray tracer)

Use and duplication is permitted under the terms of the BSD 3-clause license, see http://opensource.org/licenses/BSD-3-Clause

The source code of the testing executable in the src_test and include_test directory is released under the GPLv3 license, see https://www.gnu.org/licenses/gpl-3.0.en.html

In order to check out the code including the rte-rrtmgp submodule, use:

git clone --recurse-submodules https://github.com/earth-system-radiation/rte-rrtmgp-cpp

In case you had already checked out the repository, use:

git submodule update --init

Basic instructions

For building from source, create a build directory, for instance build. From build, trigger cmake .. -DSYST=config_file, where config_file should be replaced by one of the configuration files in the config folder, for instance -DSYST=macbook_brew.

Building the source creates an executable test_rte_rrtmgp. Three test cases are provided in directories rfmip, allsky, and rcemip. In order to run those cases follow the instructions in the README.md of those respective directories.

In general, in order to run a test case, make sure the following files are present in the directory from which test_rte_rrtmgp is triggered:

1. Input file rte_rrtmgp_input.nc with atmospheric profiles of pressure, temperature, and gases.
2. Long wave coefficients file from original RTE+RRTMGP repository (in rrtmgp/data) as coefficients_lw.nc
3. Short wave coefficients file from original RTE+RRTMGP repository (in rrtmgp/data) as coefficients_sw.nc
4. Long wave cloud optics coefficients file from original RTE+RRTMGP repository (in rrtmgp-data) as cloud_coefficients_lw.nc
5. Short wave cloud optics coefficients file from original RTE+RRTMGP repository (in rrtmgp-data) as cloud_coefficients_sw.nc