Contribution to the validation of GHG space missions by the French COCCON consortium using ground-based FTIR measurements
Yao Té, Sorbonne Université - LERMA (France), yao-veng.te@sorbonne-universite.fr (Presenter)
Pascal Jeseck, LERMA (France), pascal.jeseck@sorbonne-universite.fr
Corinne Boursier, Sorbonne Université - LERMA (France), corinne.boursier@sorbonne-universite.fr
Thomas Lesigne, LERMA (France), thomas.lesigne@etu.sorbonne-universite.fr
Christof Janssen, LERMA (France), christof.janssen@sorbonne-universite.fr
Caroline Bès, CNES (France), caroline.bes@cnes.fr
Denis Jouglet, CNES (France), denis.jouglet@cnes.fr
Cyril Crevoisier, LMD (France), cyril.crevoisier@lmd.ipsl.fr
Morgan Lopez, LSCE (France), morgan.lopez@lsce.ipsl.fr
Michel Ramonet, LSCE (France), michel.ramonet@lsce.ipsl.fr
Lilian Joly, GSMA (France), lilian.joly@univ-reims.fr
Abdelhamid Hamdouni, GSMA (France), hamid.hamdouni@univ-reims.fr
Bruno Grouiez, GSMA (France), bruno.grouiez@univ-reims.fr
Monitoring of greenhouse gas concentrations (GHG) has become an urgent topic and priority for countries who have signed the Paris agreement. Some countries have already launched space mission to measure the GHG composition of the atmosphere (GOSAT, OCO, S5P), some are involved in future GHG mission programs (MicroCarb, MERLIN, GeoCARB, CO2M, …). Only satellites allow a global monitoring of these concentrations. However, these satellite instruments need reference measurements to validate their correct operation and the accuracy of their measurements. Known reference measurements networks are the remote sensing TCCON and the in situ ICOS network; and more recently the COCCON network initiated by KIT.
Since 2020, a French working group formed by four scientific laboratories (LERMA, LMD, LSCE, GSMA) and CNES operates up to five EM27/SUN instruments according to the COCCON requirements (centralized review of instrument performance and characteristics performed at KIT, use of common processing tools). The Bruker EM27/SUN allow combined COCCON measurements of both XCO2 and XCH4 from the ground. Easily transportable, these instruments can be placed on the satellite ground track, so that simultaneous ground and satellite measurements on the same air mass can be made. The retrieval of the atmospheric spectra has been carried out using the PROFFAST software, developed at KIT.
In order to check the stability of the consortium instruments and for monitoring the evolution of their Instrument Line Shapes (ILS), an ILS measurement bench similar to the one developed at KIT (cf. Frey et al. 2015), has been set up at LERMA. EM27/SUN total column products have been and will be regularly compared to results from TCCON. The working group has also implemented an automated processing chain for COCCON data, perfomed total colum sensitivity studies, studied the impact of CAMS priors on total columns, followed-up difference between COCCON and TCCON measurements and participated at a variaty of Aircore and COCCON comparisons in the frame of MAGIC. the MAGIC project is a French effort to coordinate different validation activities at the national level. It combines different measurement techniques and platforms, such as ground, airplane and balloon and measurement techniques. Here we present an overview activities of the French COCCON group.
Poster: Poster_T__127_25.pdf
Presentation Type: Poster
Session: 2.2b Uncertainty quantification and bias correction techniques
Session Date: Tuesday (6/15) 9:45 AM