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| Titel |
Improved agreement of AIRS tropospheric carbon monoxide products with other EOS sensors using optimal estimation retrievals |
| VerfasserIn |
J. X. Warner, Z. Wei, L. L. Strow, C. D. Barnet, L. C. Sparling, G. Diskin, G. Sachse |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 19 ; Nr. 10, no. 19 (2010-10-08), S.9521-9533 |
| Datensatznummer |
250008816
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| Publikation (Nr.) |
 copernicus.org/acp-10-9521-2010.pdf |
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| Zusammenfassung |
| We present in this paper an alternative retrieval algorithm for the
Atmospheric Infrared Sounder (AIRS) tropospheric Carbon Monoxide (CO)
products using the Optimal Estimation (OE) technique, which is different
from the AIRS operational algorithm. The primary objective for this study
was to compare AIRS CO, as well as the other retrieval properties such as
the Averaging Kernels (AKs), the Degrees of Freedom for Signal (DOFS), and
the error covariance matrix, against the Tropospheric Emission Spectrometer
(TES) and the Measurement of Pollution in the Troposphere (MOPITT) CO, which
were also derived using the OE technique. We also demonstrate that AIRS OE
CO results are much more realistic than AIRS V5 operational CO, especially
in the lower troposphere and in the Southern Hemisphere (SH). These products
are validated with in situ profiles obtained by the Differential Absorption
Carbon Monoxide Measurements (DACOM), which took place as part of NASA's
Intercontinental Chemical Transport Experiment (INTEX-B) field mission that
was conducted over the northern Pacific in Spring 2006. To demonstrate the
differences existing in the current operational products we first show a
detailed direct comparison between AIRS V5 and TES operational V3 CO for the
global datasets from December 2005 to July 2008. We then present global CO
comparisons between AIRS OE, TES V3, and MOPITT V4 at selected pressure
levels as well as for the total column amounts. We conclude that the
tropospheric CO retrievals from AIRS OE and TES V3 agree to within 5–10 ppbv or
5% on average globally and throughout the free troposphere. The
agreements in total column CO amounts between AIRS OE and MOPITT V4 have
improved significantly compared to AIRS V5 with global relative RMS
differences now being 12.7%. |
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