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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-290
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Nov 2016
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Global height-resolved methane retrievals from the Infrared Atmospheric Sounding Interferometer (IASI) on MetOp
Richard Siddans1,2, Diane Knappett1,2, Alison Waterfall1, Jane Hurley1, Barry Latter1,2, Brian Kerridge1,2, Hartmut Boesch2,3, and Robert Parker2,3 1STFC Rutherford Appleton Laboratory, Chilton, United Kingdom
2National Centre for Earth Observation, United Kingdom
3University of Leicester, United Kingdom
Abstract. This paper describes the global height-resolved methane (CH4) retrieval scheme for the Infrared Atmospheric Sounding Interferometer (IASI) on MetOp, developed at the Rutherford Appleton Laboratory (RAL). The scheme is novel in: (a) precisely fitting measured spectra in the 7.9 micron region to allow information to be retrieved on two independent layers centred in the upper and lower troposphere and (b) making specific use of nitrous oxide (N2O) spectral features in the same spectral interval to directly retrieve effective cloud parameters to mitigate errors in retrieved methane due to residual cloud and other geophysical variables. The scheme has been applied to analyse IASI measurements between 2007 and 2015. Results are compared to model fields from the MACC greenhouse gas inversion and independent measurements from satellite (GOSAT), airborne (HIPPO) and ground (TCCON) sensors. The scheme is shown to be capable of retrieving column average methane with random errors of ~20–40 ppbv on individual soundings. Systematic differences with the other datasets are typically < 10 ppbv regionally, and < 5 ppbv globally. The data has been made publically available via CEDA (http://dx.doi.org/10.5285/B6A84C73-89F3-48EC-AEE3-592FEF634E9B).

Citation: Siddans, R., Knappett, D., Waterfall, A., Hurley, J., Latter, B., Kerridge, B., Boesch, H., and Parker, R.: Global height-resolved methane retrievals from the Infrared Atmospheric Sounding Interferometer (IASI) on MetOp, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-290, in review, 2016.
Richard Siddans et al.
Richard Siddans et al.
Richard Siddans et al.

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Short summary
This paper describes an algorithm to infer the global atmospheric distribution of the greenhouse gas methane, from measurements made by the infra-red, nadir viewing spectrometer IASI, on board the Metop polar orbiting satellites. The algorithm has been applied to 9 years of data. Results are presented and validated by comparison to independent measurements.
This paper describes an algorithm to infer the global atmospheric distribution of the greenhouse...
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