edu.ucar.opensky::articles:6280 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:18:16.064679 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7zg6sf8 Validation of HNO₃, CIONO₂, and N₂O₅ from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) 2008-07-07T00:00:00Z publication https://n2t.org/ark:/85065/d7zg6sf8 https://doi.org/10.5194/acpd-8-2429-2008 Wolff, M. author Kerzenmacher, T. author Strong, K. author Walker, K. author Toohey, M. author Dupuy, E. author Bernath, P. author Boone, C. author Brohede, S. author Catoire, V. author von Clarmann, T. author Coffey, Michael T. author Daffer, W. author De Mazière, M. author Duchatelet, P. author Glatthor, N. author Griffith, D. author Hannigan, James W. author Hase, F. author Höpfner, M. author Huret, N. author Jones, N. author Jucks, K. author Kagawa, A. author Kasai, Y. author Kramer, I. author Küllmann, H. author Kuttippurath, J. author Mahieu, E. author Manney, G. author Wood, S. author McElroy, C. author McLinden, C. author Mébarki, Y. author Mikuteit, S. author Murtagh, D. author Piccolo, C. author Raspollini, P. author Ridolfi, M. author Ruhnke, R. author Santee, M. author Senten, C. author Smale, D. author Tétard, C. author Urban, J. author UCAR/NCAR - Library publisher The Atmospheric Chemistry Experiment (ACE) satellite was launched on 12 August 2003. Its two instruments measure vertical profiles of over 30 atmospheric trace gases by analyzing solar occultation spectra in the ultraviolet/visible and infrared wavelength regions. The reservoir gases HNO₃, CIONO₂, and N₂O₅ are three of the key species provided by the primary instrument, the ACE Fourier Transform Spectrometer (ACE-FTS). This paper describes the ACE-FTS version 2.2 data products, including the N₂O₅ update, for the three species and presents validation comparisons with available observations. We have compared volume mixing ratio (VMR) profiles of HNO₃, CIONO₂, and N₂O₅ with measurements by other satellite instruments (SMR, MLS, MIPAS), aircraft measurements (ASUR), and single balloon-flights (SPIRALE, FIRS-2). Partial columns of HNO₃ and CIONO₂ were also compared with measurements by ground-based Fourier Transform Infrared (FTIR) spectrometers. Overall the quality of the ACE-FTS v2.2 HNO₃ VMR profiles is good from 18 to 35 km. For the statistical satellite comparisons, the mean absolute differences are generally within ±1 ppbv (±20%) from 18 to 35 km. For MIPAS and MLS comparisons only, mean relative differences lie within ±10% between 10 and 36 km. ACE-FTS HNO₃ partial columns (~15-30 km) show a slight negative bias of -1.3% relative to the ground-based FTIRs at latitudes ranging from 77.8° S-76.5° N. Good agreement between ACE-FTS CIONO₂ and MIPAS, using the Institut für Meteorologie und Klimaforschung and Instituto de Astrofísica de Andalucía (IMK-IAA) data processor is seen. Mean absolute differences are typically within ±0.01 ppbv between 16 and 27 km and less than +0.09 ppbv between 27 and 34 km. The CIONO₂ partial column comparisons show varying degrees of agreement, depending on the location and the quality of the FTIR measurements. Good agreement was found for the comparisons with the midlatitude Jungfraujoch partial columns for which the mean relative difference is 4.7%. ACE-FTS N₂O₅ has a low bias relative to MIPAS IMK-IAA, reaching -0.25 ppbv at the altitude of the N₂O₅ maximum (around 30 km). Mean absolute differences at lower altitudes (16-27 km) are typically -0.05 ppbv for MIPAS nighttime and ±0.02 ppbv for MIPAS daytime measurements. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright Authors 2008. This work is distributed under the Creative Commons Attribution 3.0 License None eng geoscientificInformation