Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 12, 1823-1832, 2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research Article
17 Feb 2012
Validation of TES methane with HIPPO aircraft observations: implications for inverse modeling of methane sources
K. J. Wecht1, D. J. Jacob1, S. C. Wofsy1, E. A. Kort1, J. R. Worden2, S. S. Kulawik2, D. K. Henze3, M. Kopacz4,*, and V. H. Payne5
1Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
2Jet Propulsion Laboratory/California Institute of Technology, Pasadena, CA, USA
3Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, USA
4Woodrow Wilson School of Public and International Affairs, Princeton University, USA
5Atmospheric Environmental Research, Lexington, MA, USA
*now at: NOAA Climate Program Office, Silver Spring, MD, USA

Abstract. 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.

Citation: Wecht, K. J., Jacob, D. J., Wofsy, S. C., Kort, E. A., Worden, J. R., Kulawik, S. S., Henze, D. K., Kopacz, M., and Payne, V. H.: Validation of TES methane with HIPPO aircraft observations: implications for inverse modeling of methane sources, Atmos. Chem. Phys., 12, 1823-1832, doi:10.5194/acp-12-1823-2012, 2012.
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