Global Satellite-Based Atmospheric Profiles from Atmospheric Chemistry Experiment SciSat Level 2 Processed Data, v5.2, 2004-2024

The Atmospheric Chemistry Experiment is a satellite-based mission that has been probing the Earth's atmosphere via solar occultation since February 2004. The solar occultation approach provides global coverage over the order of a few months, with up to 30 occultations over limited latitude ranges on a given day. Instruments on board include a high-resolution Fourier transform spectrometer (ACE-FTS) measuring in the infrared (750-4400 cm-1) and a pair of filtered imagers operating at 1.02 and 0.525 µm. Level 2 data on a 1-km altitude grid from ACE-FTS processing version v5.2, spanning February 2004 to November 2024, are provided in this data set. The new processing version fixes issues observed for previous processing versions and updates the spectroscopic database to the most recent information. Three new data products are added: line of sight winds and volume mixing ratios for two molecules: HFC-32 (CH2F2) and HOCl. Forward model calculations are updated to account for the finite ACE-FTS field of view. ACE SciSat Level 2 Processed Data, v5.2. Temperature, Pressure and Volume Mixing Ratio (VMR) profiles as a function of altitude for many atmospherically relevant molecules: H2O, O3, N2O, CO, CH4, NO, NO2, HNO3, HF, HCl, OCS, N2O5, ClONO2, HCN, CH3Cl, CF4, CFC-12 (CCl2F2), CFC-11 (CCl3F), COF2, COCl2, COClF, C2H6, C2H2, HCFC-22 (CHClF2), HCOOH, SF6, HO2NO2, H2O2, H2CO, CH3OH, CCl4, N2, O2, CFC-113 (Cl2FC-CClF2), HCFC-141b (Cl2FC-CH3), HCFC-142b (ClF2C-CH3), HFC-134a (F3C-CFH2), PAN (CH3C(O)OONO2), CHF3, acetone (C3H6O), SO2, CH3CN, ClO, CO2, HFC-32 (CH2F2), and HOCl, as well as isotopologues for some of these molecules and line of sight winds. Imager (IMG) and geolocation (GLC) data are also included, as well as some selected residual spectra. C. Boone, et al. Version 5 retrievals for ACE-FTS and ACE-imagers. Journal of Quantitative Spectroscopy and Radiative Transfer. 310, 108749 (2023). doi: 10.1016/j.jqsrt.2023.108749