ИСТИНА

The recently-released 2020 edition of the HITRAN database has continued efforts to include and improve appropriate spectroscopic data for studying a variety of planetary atmospheres. In particular, line lists for key atmospheric species (e.g., SO2, NH3, C2H2, PH3) have received substantial updates, compared to HITRAN2016 [1], which include extending spectral coverage and improving line positions, intensities, and broadening coefficients. There are currently 55 molecules with line-by-line parameters in HITRAN, with new species being included for HITRAN2020 that have particular relevance to planetary atmospheres (e.g., GeH4, CS2, SO). Furthermore, additional planetary-relevant absorption cross-sections and collision-induced absorption data are now included. Pressure-broadening parameters (and their temperature dependencies) for H2, He, CO2 and H2O are also provided for numerous species, allowing opacities to be calculated using HITRAN data for a variety of planetary atmospheres, including Venus, Mars, and Jupiter. The temperature range of planetary atmospheres can substantially exceed those found on Earth, therefore it is necessary to account for significantly more transitions when modelling high-temperatures environments. In addition, high-resolution observations require accurate spectroscopic parameters to enable characterization of these atmospheres. The HITEMP database [2] provides line-by-line parameters for use at high temperature and has recently been undergoing a significant upgrade. HITEMP line lists are now available for N2O, NO2 [3] and CH4 [4], while the CO, NO and OH line lists have been updated [3,5]. For CH4, an intensity compression technique has been introduced that is capable of being accurate at modelling high-temperature spectra, and also practical to use [4]. The additions of planetary-relevant molecules and spectroscopic parameters for HITRAN2020 will be discussed, along with recent updates to the HITEMP database. Note that a companion poster by I. Gordon will discuss the improvements in HITRAN2020 that are relevant to the remote sensing of terrestrial atmosphere. [1] I. E. Gordon, et al., J. Quant. Spectrosc. Radiat. Transfer, 2016, 203, 3-67. [2] L. S. Rothman, et al., J. Quant. Spectrosc. Radiat. Transfer, 2010, 111, 2139-2150. [3] R. J. Hargreaves, et al., J. Quant. Spectrosc. Radiat. Transfer, 2019, 232, 35-53. [4] R. J. Hargreaves, et al., Astrophys. J. Supp. Ser., 2020, 247, A55. [5] G. Li, et al., Astrophys. J. Supp. Ser., 2015, 216, A15.