Validation of HNO3, ClONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) M. A. Wolff1, T. Kerzenmacher1, K. Strong1, K. A. Walker1,2, M. Toohey1, E. Dupuy2, P. F. Bernath2,3, C. D. Boone2, S. Brohede4, V. Catoire5, T. von Clarmann6, M. Coffey7, W. H. Daffer8, M. De Mazière9, P. Duchatelet10, N. Glatthor6, D. W. T. Griffith11, J. Hannigan7, F. Hase6, M. Höpfner6, N. Huret5, N. Jones11, K. Jucks12, A. Kagawa13,14, Y. Kasai14, I. Kramer6, H. Küllmann15, J. Kuttippurath15,*, E. Mahieu10, G. Manney16,17, C. T. McElroy18, C. McLinden18, Y. Mébarki5, S. Mikuteit6, D. Murtagh4, C. Piccolo19, P. Raspollini20, M. Ridolfi21, R. Ruhnke6, M. Santee16, C. Senten9, D. Smale22, C. Tétard23, J. Urban4, and S. Wood22 1Department of Physics, University of Toronto, Toronto, Ontario, Canada 2Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada 3Department of Chemistry, University of York, York, UK 4Department of Radio and Space Science, Chalmers University of Technology, Gothenburg, Sweden 5Laboratoire de Physique et Chimie de L'Environment CNRS – Université d'Orléans, Orléans, France 6Forschungzentrum Karlsruhe and Univ. of Karlsruhe, Institute for Meteorology and Climate Research, Karlsruhe, Germany 7National Center for Atmospheric Research (NCAR), Boulder, CO, USA 8Columbus Technologies Inc., Pasadena, CA, USA 9Belgian Institute for Space Aeronomy, Brussels, Belgium 10Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium 11School of Chemistry, University of Wollongong, Wollongong, Australia 12Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA 13Fujitsu FIP Corporation, Tokyo, Japan 14Environmental Sensing and Network Group, National Institute of Information and Communications Technology (NICT), Tokyo, Japan 15Institute of Environmental Physics, University of Bremen, Bremen, Germany 16Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA 17New Mexico Institute of Mining and Technology, Socorro, NM, USA 18Environment Canada, Toronto, Ontario, Canada 19Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, UK 20Institute of Applied Physics "Nello Carrara", National Research Center (CNR), Firenze, Italy 21Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Bologna, Italy 22National Institute of Water and Atmospheric Research Ltd., Central Otago, New Zealand 23Laboratoire d'Optique Atmosphérique, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France *now at: LMD/CNRS Ecole polytechnique, Palaiseau Cedex, France
Abstract. 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, ClONO2,
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, ClONO2, 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 ClONO2
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 ClONO2 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 ClONO2 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.
Citation: Wolff, M. A., Kerzenmacher, T., Strong, K., Walker, K. A., Toohey, M., Dupuy, E., Bernath, P. F., Boone, C. D., Brohede, S., Catoire, V., von Clarmann, T., Coffey, M., Daffer, W. H., De Mazière, M., Duchatelet, P., Glatthor, N., Griffith, D. W. T., Hannigan, J., Hase, F., Höpfner, M., Huret, N., Jones, N., Jucks, K., Kagawa, A., Kasai, Y., Kramer, I., Küllmann, H., Kuttippurath, J., Mahieu, E., Manney, G., McElroy, C. T., McLinden, C., Mébarki, Y., Mikuteit, S., Murtagh, D., Piccolo, C., Raspollini, P., Ridolfi, M., Ruhnke, R., Santee, M., Senten, C., Smale, D., Tétard, C., Urban, J., and Wood, S.: Validation of HNO3, ClONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), Atmos. Chem. Phys., 8, 3529-3562, doi:10.5194/acp-8-3529-2008, 2008.