A. Lambert

Anderson

B. J. Drouin

B. W. Knosp

Bernath

Boone

C. D. Boone

C. R. Webster

Chipperfield

Considine

D. T. Cuddy

D. W. Fahey

Froidevaux

G. C. Toon

G. L. Manney

H. C. Pumphrey

J. W. Waters

Jarnot

Jiang

Johnson

K. A. Walker

K. W. Jucks

L. E. Christensen

L. Froidevaux

Lary

Livesey

M. J. Schwartz

Mahieu

Manney

Marcy

McHugh

N. J. Livesey

Nassar

P. A. Wagner

P. C. Stek

P. F. Bernath

P. J. Popp

Proffitt

R. A. Fuller

R. A. Stachnik

R. E. Cofield

R. F. Jarnot

R. P. Thurstans

R. S. Gao

R. S. Harwood

Read

Rinsland

Rodgers

Russell

Santee

Schneider

Schoeberl

Schwartz

Solomon

T. P. Marcy

Toon

V. S. Perun

W. G. Read

W. H. Daffer

W. V. Snyder

Waters

Webster

Y. B. Jiang

Zander

English

Crossref

Validation of Aura Microwave Limb Sounder HCl measurements

The 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 (similar to 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 similar to 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 (similar to 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 aircraft HCl/O-3 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.</p

Froidevaux, L.

Jiang, Y. B.

Lambert, A.

Livesey, N. J.

Read, W. G.

Waters, J. W.

Fuller, R. A.

Marcy, T. P.

Popp, P. J.

Gao, R. S.

Fahey, D. W.

Jucks, K. W.

Stachnik, R. A.

Toon, G. C.

Christensen, L. E.

Webster, C. R.

Bernath, P. F.

Boone, C. D.

Walker, K. A.

Pumphrey, Hugh

Harwood, R. S.

Manney, G. L.

Schwartz, M. J.

Daffer, W. H.

Drouin, B. J.

Cofield, R. E.

Cuddy, D. T.

Jarnot, R. F.

Knosp, B. W.

Perun, V. S.

Snyder, W. V.

Stek, P. C.

Thurstans, R. P.

Wagner, P. A.

Edinburgh Research Explorer

Atmospheric Chemistry Experiment (ACE): Mission overview,

Earth Observing System (EOS) Aura science data validation plan, report, version 1.0, NASA Goddard Space Flight Cent.,

Halogen Occultation Experiment confirmation of stratospheric chlorine decreases in accordance with the Montreal protocol,

Multiannual simulations with a threedimensionalchemicaltransportmodel,J.Geophys.Res.,104,1781–1805,

Noncoincident validation of Aura MLS observations using the Langley Research Center Lagrangian Chemistry and transport

Retrievals for the Atmospheric Chemistry Experiment Fourier-Transform Spectrometer,

Validation of Aura Microwave Limb Sounder HCl measurements

Abstract

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Edinburgh Research Explorer