Description

This is a collection of tools to inspect the CloudCoeff.bin binary files containing the CRTM cloud scattering LUTs. Single-scattering properties for the following particle types in the CRTM can be retrieved in the IR and MW:

• rain
• ice
• snow
• graupel
• hail

Numerical values are saved in ASCII format and python scripts are provided to reconstruct the phase function from the retrieved Legendre expansion coefficients..

Getting Started

Requirements

This tool requires a linked version of the CRTM library. The code has been tested with CRTM REL-2.1.3 to 2.3.0. A Python installation with NumPy and Matplotlib modules is required for the plotting scripts.

Compiling the Code

1. Set the environmental variable FCC to your Fortran compiler of choice.
2. Run make in the ./build folder.

Using the Code

Preliminaries

• If you are using the code, please cite the corresponding paper by Stegmann et al., (2018) in any publication (journal paper, presentation, poster,...) where you are using the code's results.
• If you plan to develop or modify the code, please create a feature branch from develop or fork the repository.

Running the Code

To run the program extracting the scattering properties, place the CloudCoeff.bin under scrutiny in the INSPECT_CloudCoeff/fix folder as a first step. Subsequently execute the ASCII extraction program in the /bin folder by running the executable ./InspectCloudCoeff.x and follow the instructions on the screen. To reconstruct either the MW or IR phase functions, execute either one of the plot_legendre_*.py Python scripts in the /scripts folder and enter the number of streams for the Legendre expansion.

LICENSE:

Please see the file LICENSE.txt for details.

References

Stegmann, P. G., G. Tang, P. Yang, B. T. Johnson (2018): "A stochastic model for density-dependent microwave Snow- and Graupel scattering coefficients of the NOAA JCSDA community radiative transfer model.", J. Quant. Spec. Rad. Trans. 211, 9-24.