X-MASS: A TOOL FOR SIMULTANEOUS CALCULATIONS OF CROSS-SECTIONS COVERING A LARGE PARAMETER SPACE FOR ATMOSPHERIC APPLICATIONS

Makhnev, Vladimir Yu

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https://hdl.handle.net/2142/122439 Copy

Description

Title

X-MASS: A TOOL FOR SIMULTANEOUS CALCULATIONS OF CROSS-SECTIONS COVERING A LARGE PARAMETER SPACE FOR ATMOSPHERIC APPLICATIONS

Author(s)

Makhnev, Vladimir Yu

Contributor(s)

• Rothman, Laurence S.
• Hargreaves, Robert J.
• Gordon, Iouli E

Issue Date

2023-06-21

Keyword(s)

Atmospheric science

Abstract

Reliable spectroscopic information, including that provided in the HITRAN databaseᵃ, is essential when interpreting data from high-resolution remote sensing spectrometers that monitor the concentrations of gases in the terrestrial atmosphere. High spectral resolution molecular absorption calculations over a wide spectral range and diverse parameter space using line-by-line models are often considered too slow to be used in operational retrieval algorithms. This is further slowed when using advanced line-shapes and line-mixing parametrizations that are available in HITRAN for many molecules (e.g. Hashemi et al.ᵇ), which are necessary for accuracy. As an alternative, retrieval codes often rely on massive sets of pre-calculated tables of absorption cross-sections for target molecules that cover a representative set of environmental conditions. For some missions, such as the NASA Orbiting Carbon Observatory (OCO-2/3)ᶜ, molecular absorption coefficients are calculated off-line for a range of pressures, temperatures, and H₂O volume mixing ratios and stored in “ABSCO” lookup tablesᵈ. We present a Python tool (X-MASS) that allows the massive set of ABSCO tables to be calculated using the HAPI software packageᵉ with complete utilization of the parameters’ accuracy in HITRAN, including sophisticated line shapes. The outputs will be made available in the convenient HDF5 or NetCDF formats given user-defined wavenumber step, set of pressures, temperatures, and diluent gas contents. X-MASS will be an open-source library where users can specify parameters for their applications. In addition, a set of pre-calculated ABSCO tables covering spectral range of molecules at a finer grid and resolution will be provided on the HITRAN website. This work will facilitate the timely integration of state-of-the-art spectroscopic data into atmospheric radiative transfer codes.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122439

DOI

https://doi.org/10.15278/isms.2023.6741

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