This webpage gives an overview of the METOP/IASI CH4 data product (De Wachter et al., 2017) developed at BIRA-IASB.

The IASI CH4 product is developed with the ASIMUT-ALVL algorithm. ASIMUT-ALVL is a radiative transfer and inversion software developed at BIRA-IASB, designed for simulating atmospheric radiances and inversions in planetary atmospheres (Vandaele et al., 2006). The ASIMUT-ALVL code has a specific interface dealing with the IASI instrument characteristics. The retrieval is based on the optimal estimation method (Rodgers, 2000).

Complementary to the IASI CH4 product, BIRA-IASB retrieves vertical profiles of dust aerosols and volcanic ash from IASI spectra (Vandenbussche et al., 2013; Maes et al., 2016). The dust aerosol product is currently being validated as part of the ESA Aerosol CCI project. For more information, have a look at the Aerosol CCI website or contact Sophie Vandenbussche (This email address is being protected from spambots. You need JavaScript enabled to view it.).

For additional information about the IASI CH4 data product, please contact This email address is being protected from spambots. You need JavaScript enabled to view it..


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 Figure 1 : Monthly mean maps of the BIRA-IASB IASI tropospheric CH4 column between 4 and 17 km for the year 2014.




De Wachter, E., Kumps, N., Vandaele, A. C., Langerock, B., and De Mazière, M.: Retrieval and validation of MetOp/IASI methane, Atmos. Meas. Tech., 10, 4623-4638,, 2017.

Maes, Kwinten, Sophie Vandenbussche, Lars Klüser, Nicolas Kumps, and Martine de Mazière. 2016. “Vertical Profiling of Volcanic Ash from the 2011 Puyehue Cordón Caulle Eruption Using IASI.” Ed. Alexander A Kokhanovsky and Prasad S Thenkabail. Remote Sensing 8 (2).

Rodgers C.D.: Inverse methods for atmospheric sounding. Theory and practice, World scientific, Singapore, 90-98, 2000.

Vandaele, A.C., M. Kruglanski, and M. De Maziere, Modelling and retrieval of Atmospheric spectra using ASIMUT in Proc. of the First ‘Atmospheric Science Conference’, ESRIN, Frascati, Italy, 8 – 12 May 2006 (ESA SP-628, July 2006).

Vandenbussche, S., Kochenova, S., Vandaele, A. C. , Kumps, N. , De Mazière, M.,  Retrieval Of Desert Dust Aerosol Vertical Profiles From Iasi Measurements In The Tir Atmospheric Window,
Atmos. Meas. Tech. 6, 2577-2591, 2013.