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Both the input data and the algorithm used to generate the product are described in detail in ATBD MTGHG, 2024.
Product Description
In this section an overview of the MTCO2_OBS4MIPS v10.1 and MTCH4_OBS4MIPS v10.2 data products- specified in terms of variable, associated characteristics, processing level(s) and instrument(s) - is given.
Each of these products presented here are retrieved from simultaneous observations of the IASI and AMSU instruments flying together onboard the three successive Metop-A, -B and -C satellites by using a non-linear inference scheme (NLIS) using Multi-Layer Perceptrons (see ATBD MTGHG, 2024 for more details) . IASI hyperspectral observations in the thermal infrared at 7.7 µm (resp. 15 µm), which are sensitive to both temperature and gas concentrations of CH4 (resp. CO2), are used in conjunction with microwave observations from the AMSU-A instruments, only sensitive to temperature, to decorrelate both signals (Crevoisier et al., 2009a, 2009b, 2013). Retrievals are thus performed at the AMSU field-of-view resolution which is 40 km at nadir, for a swath of 2200 km, allowing global coverage twice a day at 9:30 am/pm local time.
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The MT-CO2 and MT-CH4 Obs4MIPs products are gridded data products in NetCDF format with a spatial resolution of 1ox1o (i.e., using an equirectangular (Cartesian) latitude/longitude grid) and daily time resolution (see ATBD MTGHG, 2024). The MT-CO2 and MT-CH4 Obs4MIPs products are updated every 6 months.
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For more detailed information on the input data and the processing algorithm see ATBD MTGHG, 2024.
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For more detailed information on the input data and the processing algorithms, see ATBD MTGHG, 2024.
Overview of Product Target Requirements
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Table 3 and Table 4 list the main characteristics of the MTCO2_OBS4MIPS and MTCH4_OBS4MIPS products, respectively. See ATBD MTGHG, 2024, for an overview of how these products have been generated and for additional details.
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ATBD MTGHG, 2024: Crevoisier, C., Meilhac, N., C3S Greenhouse Gas (GHG: MTCO2 v10.1 & MTCH4 v10.2): Algorithm Theoretical Basis Document (ATBD)
Bojinski et al., 2014: Bojinski, S., M. Verstraete, T.C. Peterson, C. Richter, A. Simmons, M. Zemp, The Concept of Essential Climate Variables in Support of Climate Research, Applications, and Policy. Bull. Amer. Meteor. Soc., 95, 1431–1443. Available at http://journals.ametsoc.org/doi/pdf/10.1175/BAMS-D-13-00047.1, 2014.
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