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| Titel |
Validation of TES methane with HIPPO aircraft observations: implications for inverse modeling of methane sources |
| VerfasserIn |
K. J. Wecht, D. J. Jacob, S. C. Wofsy, E. A. Kort, J. R. Worden, S. S. Kulawik, D. K. Henze, M. Kopacz, V. H. Payne |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2012-02-17), S.1823-1832 |
| Datensatznummer |
250010726
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| Publikation (Nr.) |
 copernicus.org/acp-12-1823-2012.pdf |
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| Zusammenfassung |
| We validate satellite methane observations from the Tropospheric Emission
Spectrometer (TES) with 151 aircraft vertical profiles over the Pacific from
the HIAPER Pole-to-Pole Observation (HIPPO) program. We find that a
collocation window of ±750 km and ±24 h does not introduce
significant error in comparing TES and aircraft profiles. We validate both
the TES standard product (V004) and an experimental product with two pieces
of information in the vertical (V005). We determine a V004 mean bias of
65.8 ppb and random instrument error of 43.3 ppb. For V005 we determine a mean
bias of 42.3 ppb and random instrument error of 26.5 ppb in the upper
troposphere, and mean biases (random instrument errors) in the lower
troposphere of 28.8 (28.7) and 16.9 (28.9) ppb at high and low latitudes
respectively. Even when V005 cannot retrieve two pieces of information it
still performs better than V004. An observation system simulation experiment
(OSSE) with the GEOS-Chem chemical transport model (CTM) and its adjoint
shows that TES V004 has only limited value for constraining methane sources.
Our successful validation of V005 encourages its production as a standard
retrieval to replace V004. |
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