Statistical evaluation of the performance of EM27/SUN measurements as part of the MAGIC initiative

Measuring the concentration of greenhouse gases (GHGs) has become a major concern in modern society because of the growing impact of human activity on the global climate system (Hui et al. 2022). Satellite observations give an unique opportunity to observe the GHGs total columns at a global scale, but these space missions need to be validated from ground-based measurements.

In order to enhance cal/val activities of current and future space missions and to better understand the spatial and vertical distributions of GHGs in different key regions for carbon and methane cycles, the MAGIC (Monitroing of Atmospheric composition and Greenhouse gases through multi-Instrument Campaigns) initiative was launched in 2018 by CNRS and CNES, brining now together more than fifteen international teams (https://magic.aeris-data.fr). Various instruments, including research aircrafts, balloons and ground-based measurements, have been used yearly over intensive measurement campaigns. The EM27/SUN Fourier Transform Spectrometer is one of the ground-based measurement instruments used as part of this initiative. This device offers the practical advantages of portability and access to  column mole fractions of dry air  of CO₂, CH₄, CO and H₂O from solar spectra

The main objective of this study is to carry out a statistical evaluation of the EM27/SUN data collected during the MAGIC measurement campaigns. The EM27/SUN devices (LERMA, LSCE, GSMA, CNES and KIT) have been deployed at various measurement sites since 2018. For the last two years, 2022 and 2023, measurements of CO₂ and CH₄ total column have been carried out in the city of Reims as a pilot site representative of medium-sized cities on a European scale, with the aim of estimating emissions of the main greenhouse gases on a city scale. The results obtained can also be compared with data from current satellite missions (S5P, IASI, GOSAT-2) for cal/val purposes.

 

Keywords: Climate change, Greenhouse gases, Ground-based FTIR, EM27/SUN, Reims broadcasts, Comparison

 

[Hui et al. 2022]: Hui, D., Deng, Q., Tian, H., & Luo, Y. (2022). Global climate change and greenhouse gases emissions in terrestrial ecosystems. In Handbook of climate change mitigation and adaptation (pp. 23-76). Cham: Springer International Publishing.

 

Magic initiative group : Bruno GROUIEZ, Lilian JOLY, Abdelhamid HAMDOUNI, Yao TE, Pascal JESECK, Christel GUY, Caroline BES, Denis JOUGLET, Hervé HERBIN, Morgan LOPEZ, Josselin DOC, Simona LATCHABADY, Michel RAMONET, Christof JANSSEN, Marc DELMOTTE, Deniel CAROLE, Corinne BOURSIER, Nicole MONTENEGRO VARELA, Hao FU, Neil HUMPAGE, Carlos ALBERTI, Vincent CASSÉ, Bruna SILVEIRA, Frank HASE, Cyril CREVOISIER