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Validation of Aura Microwave Limb Sounder HCl MeasurementsThe Earth Observing System (EOS) Microwave Limb Sounder (MLS) aboard the Aura satellite has provided daily global HCl profiles since August 2004. We provide a characterization of the resolution, random and systematic uncertainties, and known issues for the version 2.2 MLS HCl data. The MLS sampling allows for comparisons with many (~1500 to more than 3000) closely matched profiles from the Halogen Occultation Experiment (HALOE) and Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS). These data sets provide HCl latitudinal distributions that are, overall, very similar to those from (coincident) MLS profiles, although there are some discrepancies in the upper stratosphere between the MLS and HALOE gradients. As found in previous work, MLS and ACE HCl profiles agree very well (within approximately 5%, on average), but the MLS HCl abundances are generally larger (by 10-20%) than HALOE HCl. The bias versus HALOE is unlikely to arise mostly from MLS, as a similar systematic bias (of order 15%) is not observed between average MLS and balloon-borne measurements of HCl, obtained over Fort Sumner, New Mexico, in 2004 and 2005. At the largest pressure (147 hPa) for MLS HCl, a high bias (approximately 0.2 ppbv) is apparent in analyses of low to midlatitude data versus in situ aircraft chemical ionization mass spectrometry (CIMS) HCl measurements from the Aura Validation Experiment (AVE) campaigns in 2004, 2005, and 2006; this bias is also observed in comparisons of MLS and aircraftHCl/O3 correlations. Good agreement between MLS and CIMS HCl is obtained at 100 to 68 hPa. The recommended pressure range for MLS HCl is from 100 to 0.15 hPa.
Document ID
20090004434
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
Authors
Froidevaux, L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jiang, Y. B.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lambert, A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Livesey, N. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Read, W. G.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Waters, J. W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Fuller, R. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Marcy, T. P.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Popp, P. J.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Gao, R. S.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Fahey, D. W.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Jucks, K. W.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Stachnik, R. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Toon, G. C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Christensen, L. E.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Webster, C. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bernath, P. F.
(York Univ. United Kingdom)
Boone, C. D.
(Waterloo Univ. Ontario, Canada)
Walker, K. A.
(Toronto Univ. Ontario, Canada)
Pumphrey, H. C.
(Edinburgh Univ. United Kingdom)
Harwood, R. S.
(Edinburgh Univ. United Kingdom)
Manney, G. L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Schwartz, M. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Daffer, W. H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Drouin, B. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
May 16, 2008
Publication Information
Publication: Journal of Geophysical Research - Atmospheres
Publisher: American Geophysical Union
Volume: 113
ISSN: 0148-0227
Subject Category
Space Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Earth Observing System (EOS)
Upper Atmosphere Research Satellite (UARS)
Microwave Limb Sounder (MLS)

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