Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Atmos. Meas. Tech., 7, 3623-3632, 2014
http://www.atmos-meas-tech.net/7/3623/2014/
doi:10.5194/amt-7-3623-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
05 Nov 2014
The MOPITT Version 6 product: algorithm enhancements and validation
M. N. Deeter1, S. Martínez-Alonso1, D. P. Edwards1, L. K. Emmons1, J. C. Gille1, H. M. Worden1, C. Sweeney2, J. V. Pittman3, B. C. Daube3, and S. C. Wofsy3 1Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USA
2Global Monitoring Division, NOAA/ESRL, Boulder, CO, USA
3Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
Abstract. The Measurements of Pollution in the Troposphere (MOPITT) Version 6 (V6) product for carbon monoxide (CO) incorporates several enhancements which will benefit many users of MOPITT data. V6 algorithm improvements are described in detail, and V6 validation results are presented. First, a geolocation bias related to the orientation of the MOPITT instrument relative to the TERRA platform was characterized and eliminated. Second, the variable a priori for CO concentrations for V6 is based on simulations performed with the chemical transport model Community Atmosphere Model with Chemistry (CAM-chem) for the years 2000–2009 instead of the model-derived climatology for 1997–2004 used for V5. Third, meteorological fields required for V6 retrieval processing are extracted from the MERRA (Modern-Era Retrospective Analysis For Research And Applications) reanalysis. Finally, a significant latitude-dependent retrieval bias in the upper troposphere in Version 5 products has been substantially reduced.

Citation: Deeter, M. N., Martínez-Alonso, S., Edwards, D. P., Emmons, L. K., Gille, J. C., Worden, H. M., Sweeney, C., Pittman, J. V., Daube, B. C., and Wofsy, S. C.: The MOPITT Version 6 product: algorithm enhancements and validation, Atmos. Meas. Tech., 7, 3623-3632, doi:10.5194/amt-7-3623-2014, 2014.
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Short summary
The MOPITT Version 6 product for carbon monoxide (CO) incorporates several enhancements. First, a geolocation bias has been eliminated. Second, the new variable a priori for CO concentrations is based on simulations performed with the CAM-Chem chemical transport model for the years 2000-2009. Third, required meteorological fields are extracted from the MERRA reanalysis. Finally, a retrieval bias in the upper troposphere was substantially reduced. Validation results are presented.
The MOPITT Version 6 product for carbon monoxide (CO) incorporates several enhancements. First,...
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