Validation of Aura Microwave Limb Sounder HCl measurements

L. Froidevaux; Y. B. Jiang; A. Lambert; N. J. Livesey; W. G. Read; J. W. Waters; R. A. Fuller; T. P. Marcy; P. J. Popp; R. S. Gao; D. W. Fahey; K. W. Jucks; R. A. Stachnik; G. C. Toon; L. E. Christensen; C. R. Webster; P. F. Bernath; C. D. Boone; K. A. Walker; Hugh Pumphrey; R. S. Harwood; G. L. Manney; M. J. Schwartz; W. H. Daffer; B. J. Drouin; R. E. Cofield; D. T. Cuddy; R. F. Jarnot; B. W. Knosp; V. S. Perun; W. V. Snyder; P. C. Stek; R. P. Thurstans; P. A. Wagner

doi:10.1029/2007JD009025

Validation of Aura Microwave Limb Sounder HCl measurements

L. Froidevaux, Y. B. Jiang, A. Lambert, N. J. Livesey, W. G. Read, J. W. Waters, R. A. Fuller, T. P. Marcy, P. J. Popp, R. S. Gao, D. W. Fahey, K. W. Jucks, R. A. Stachnik, G. C. Toon, L. E. Christensen, C. R. Webster, P. F. Bernath, C. D. Boone, K. A. Walker, Hugh PumphreyR. S. Harwood, G. L. Manney, M. J. Schwartz, W. H. Daffer, B. J. Drouin, R. E. Cofield, D. T. Cuddy, R. F. Jarnot, B. W. Knosp, V. S. Perun, W. V. Snyder, P. C. Stek, R. P. Thurstans, P. A. Wagner

School of Geosciences

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Abstract / Description of output

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.

Original language	English
Article number	D15S25
Pages (from-to)	-
Number of pages	23
Journal	Journal of Geophysical Research
Volume	113
Issue number	D15
DOIs	https://doi.org/10.1029/2007JD009025
Publication status	Published - 16 May 2008

Keywords / Materials (for Non-textual outputs)

HALOGEN OCCULTATION EXPERIMENT
IN-SITU MEASUREMENTS
EOS MLS
LOWER STRATOSPHERE
CHLORINE
MODEL
SPECTROMETER
RETRIEVAL
SATELLITE
PROFILES

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10.1029/2007JD009025

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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., ... Wagner, P. A. (2008). Validation of Aura Microwave Limb Sounder HCl measurements. Journal of Geophysical Research, 113(D15), -. Article D15S25. https://doi.org/10.1029/2007JD009025

@article{c3f61350b3de4583a45225da7f845c66,

title = "Validation of Aura Microwave Limb Sounder HCl measurements",

abstract = "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.",

keywords = "HALOGEN OCCULTATION EXPERIMENT, IN-SITU MEASUREMENTS, EOS MLS, LOWER STRATOSPHERE, CHLORINE, MODEL, SPECTROMETER, RETRIEVAL, SATELLITE, PROFILES",

author = "L. Froidevaux and Jiang, {Y. B.} and A. Lambert and Livesey, {N. J.} and Read, {W. G.} and Waters, {J. W.} and Fuller, {R. A.} and Marcy, {T. P.} and Popp, {P. J.} and Gao, {R. S.} and Fahey, {D. W.} and Jucks, {K. W.} and Stachnik, {R. A.} and Toon, {G. C.} and Christensen, {L. E.} and Webster, {C. R.} and Bernath, {P. F.} and Boone, {C. D.} and Walker, {K. A.} and Hugh Pumphrey and Harwood, {R. S.} and Manney, {G. L.} and Schwartz, {M. J.} and Daffer, {W. H.} and Drouin, {B. J.} and Cofield, {R. E.} and Cuddy, {D. T.} and Jarnot, {R. F.} and Knosp, {B. W.} and Perun, {V. S.} and Snyder, {W. V.} and Stek, {P. C.} and Thurstans, {R. P.} and Wagner, {P. A.}",

year = "2008",

month = may,

day = "16",

doi = "10.1029/2007JD009025",

language = "English",

volume = "113",

pages = "--",

journal = "Journal of Geophysical Research",

issn = "0148-0227",

publisher = "Wiley-Blackwell",

number = "D15",

}

Froidevaux, L, Jiang, YB, Lambert, A, Livesey, NJ, Read, WG, Waters, JW, Fuller, RA, Marcy, TP, Popp, PJ, Gao, RS, Fahey, DW, Jucks, KW, Stachnik, RA, Toon, GC, Christensen, LE, Webster, CR, Bernath, PF, Boone, CD, Walker, KA, Pumphrey, H, Harwood, RS, Manney, GL, Schwartz, MJ, Daffer, WH, Drouin, BJ, Cofield, RE, Cuddy, DT, Jarnot, RF, Knosp, BW, Perun, VS, Snyder, WV, Stek, PC, Thurstans, RP & Wagner, PA 2008, 'Validation of Aura Microwave Limb Sounder HCl measurements', Journal of Geophysical Research, vol. 113, no. D15, D15S25, pp. -. https://doi.org/10.1029/2007JD009025

TY - JOUR

T1 - Validation of Aura Microwave Limb Sounder HCl measurements

AU - Froidevaux, L.

AU - Jiang, Y. B.

AU - Lambert, A.

AU - Livesey, N. J.

AU - Read, W. G.

AU - Waters, J. W.

AU - Fuller, R. A.

AU - Marcy, T. P.

AU - Popp, P. J.

AU - Gao, R. S.

AU - Fahey, D. W.

AU - Jucks, K. W.

AU - Stachnik, R. A.

AU - Toon, G. C.

AU - Christensen, L. E.

AU - Webster, C. R.

AU - Bernath, P. F.

AU - Boone, C. D.

AU - Walker, K. A.

AU - Pumphrey, Hugh

AU - Harwood, R. S.

AU - Manney, G. L.

AU - Schwartz, M. J.

AU - Daffer, W. H.

AU - Drouin, B. J.

AU - Cofield, R. E.

AU - Cuddy, D. T.

AU - Jarnot, R. F.

AU - Knosp, B. W.

AU - Perun, V. S.

AU - Snyder, W. V.

AU - Stek, P. C.

AU - Thurstans, R. P.

AU - Wagner, P. A.

PY - 2008/5/16

Y1 - 2008/5/16

N2 - 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.

AB - 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.

KW - HALOGEN OCCULTATION EXPERIMENT

KW - IN-SITU MEASUREMENTS

KW - EOS MLS

KW - LOWER STRATOSPHERE

KW - CHLORINE

KW - MODEL

KW - SPECTROMETER

KW - RETRIEVAL

KW - SATELLITE

KW - PROFILES

U2 - 10.1029/2007JD009025

DO - 10.1029/2007JD009025

M3 - Article

SN - 0148-0227

VL - 113

SP - -

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

IS - D15

M1 - D15S25

ER -

Validation of Aura Microwave Limb Sounder HCl measurements

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Keywords / Materials (for Non-textual outputs)

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