Articles | Volume 14, issue 1
Atmos. Chem. Phys., 14, 103–114, 2014
Atmos. Chem. Phys., 14, 103–114, 2014

Research article 03 Jan 2014

Research article | 03 Jan 2014

Global carbon monoxide products from combined AIRS, TES and MLS measurements on A-train satellites

J. X. Warner1, R. Yang1, Z. Wei1, F. Carminati1,5,6, A. Tangborn2, Z. Sun3, W. Lahoz4,5, J.-L. Attié5,6, L. El Amraoui5, and B. Duncan7 J. X. Warner et al.
  • 1Department of Atmospheric & Oceanic Science, University of Maryland, 3433 Computer & Space Sciences Bldg, College Park, MD, USA
  • 2Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD, USA
  • 3Universities Space Research Association, 10211 Wincopin Circle, Columbia, MD 21044, USA
  • 4Norwegian Institute of Air Research, Instituttveien 18, Kjeller 2027, Norway
  • 5CNRM-GAME, Météo-France and CNRS, UMR3589, Toulouse, France
  • 6Laboratoire d'Aérologie, Université de Toulouse, CNRS, UMR5560, Toulouse, France
  • 7Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA

Abstract. This study tests a novel methodology to add value to satellite data sets. This methodology, data fusion, is similar to data assimilation, except that the background model-based field is replaced by a satellite data set, in this case AIRS (Atmospheric Infrared Sounder) carbon monoxide (CO) measurements. The observational information comes from CO measurements with lower spatial coverage than AIRS, namely, from TES (Tropospheric Emission Spectrometer) and MLS (Microwave Limb Sounder). We show that combining these data sets with data fusion uses the higher spectral resolution of TES to extend AIRS CO observational sensitivity to the lower troposphere, a region especially important for air quality studies. We also show that combined CO measurements from AIRS and MLS provide enhanced information in the UTLS (upper troposphere/lower stratosphere) region compared to each product individually. The combined AIRS–TES and AIRS–MLS CO products are validated against DACOM (differential absorption mid-IR diode laser spectrometer) in situ CO measurements from the INTEX-B (Intercontinental Chemical Transport Experiment: MILAGRO and Pacific phases) field campaign and in situ data from HIPPO (HIAPER Pole-to-Pole Observations) flights. The data fusion results show improved sensitivities in the lower and upper troposphere (20–30% and above 20%, respectively) as compared with AIRS-only version 5 CO retrievals, and improved daily coverage compared with TES and MLS CO data.

Final-revised paper