ИСТИНА

The HITRAN database is essential to the remote sensing of the terrestrial atmosphere. The new 2020 edition of the database will be presented. It is a coordinated effort that includes dozens of international experimentalists, theoreticians, atmospheric and planetary scientists who measure, calculate and validate the HITRAN data. The lists for almost all of the HITRAN molecules in the line-by-line section were updated (and several additional molecules have been added) in comparison with the previous compilation HITRAN2016 [1]. The extent of these improvements range from updating a few lines of certain molecules to complete replacements of the lists and introducing additional isotopologues. Many new vibrational bands were added to the database, extending the spectral coverage and completeness of the line lists. Six new molecules were also added to HITRAN, including CH3F, CS2, CH3I, and NF3 that are all important for remote sensing. In addition, the accuracy of the parameters for major atmospheric absorbers has been increased, often featuring sub-percent uncertainties. The number of parameters was also increased significantly, now incorporating, for instance, non-Voigt line profiles for many gases [2,3]; broadening by water vapor [4]; update of collision-induced absorption sets [5],to name a few. The HITRAN2020 edition continues to take advantage of the new database structure and interface available at www.hitran.org [6] and through the HITRAN Application Programming Interface (HAPI) [7].The functionality of both tools has been extended for the new edition. Some of the validation efforts will be demonstrated. Note, a parallel poster by R. Hargreaves regarding improvements concerning planetary atmospheres. This work is supported by NASA [1] Gordon et al., JQSRT, 2017, 203, 3–69. [2] Hashemi et al., JQSRT, 2020, 256, 107283. [3] Hashemi et al., JQSRT, 2021, 271, 107735. [4] Tan et al., J. Geophys. Res. Atmos., 2019, 2019JD030929 [5] Karman et al., Icarus.,2019, 328, 160–175. [6] Hill et al., JQSRT, 2016, 177, 4–14. [7] Kochanov et al., JQSRT, 2016, 177, 15–30.