Water Vapor Vertical Distribution on Mars after Six Years of TGO/NOMAD Solar Occultations. Part I: Global Climatology [Dataset]

Data set for the paper "Water Vapor Vertical Distribution on Mars after Six Years of TGO/NOMAD Solar Occultations. Part I: Global Climatology" (submitted to JGR: Planets).

1. Description of methods used for collection/generation of data: 
The Nadir and Occultation for MArs Discovery (NOMAD) instrument is an spectrometer covering the spectral range between 0.2 to 4.3 µm. Its solar occultation (SO) channel acquires transmittance spectra at different diffraction orders sounding the limb of the Martian atmosphere. It uses a 4 lines/mm echelle grating in a litrow configuration. An Acousto-Optical Tunable Filter (AOTF) is used to select different diffraction orders. The spectral resolution of the SO channel is λ/∆λ=17,000. After spectral calibration, the vertical profiles are obtained using the state-of-the-art line-by-line Karlsruhe Optimized Radiative transfer Algorithm (KOPRA). The IAA level-2 processor relies on multi-parameter non-linear least squares fitting of measured and modeled spectra. The profiles in this data set have been obtained analyzing the NOMAD SO diffraction orders 134 (3011-3035 cm-1), 136 (3056-3081 cm-1), 168 (3775-3805 cm-1) and 169 (3798-3828 cm-1).

2. Author contact information:
adrianbm@iaa.es