Global atmospheric methanol emissions inferred  from IASI satellite measurements and aircraft data

Müller, Jean-François; Stavrakou, Trissevgeni; Franco, Bruno; Clarisse, Lieven; Amelynck, Crist; Schoon, Niels; Verreyken, Bert; Opacka, Beata; Vigouroux, Corinne; Guenther, Alex B.; Mahieu, Emmanuel; Makarova, Maria; Strong, Kimberly

doi:10.5194/acp-26-5375-2026

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Global atmospheric methanol emissions inferred from IASI satellite measurements and aircraft data

Müller, Jean-François; Stavrakou, Trissevgeni; Franco, Bruno et al.

2026 • In Atmospheric Chemistry and Physics, 26 (8), p. 5375-5406

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Keywords :

atmospheric composition; methanol; atmospheric modeling; infrared remote-sensing; in situ measurements

Abstract :

[en] Abstract. We employ an updated retrieval of space-based methanol (CH3OH) column measurements from the Infrared Atmospheric Sounding Interferometer (IASI) and an emission optimisation framework built on the MAGRITTE chemical transport model to assess terrestrial emissions of methanol to the atmosphere between 2008–2019. We first carry out a IASI CH3OH validation study based on concentration measurements from three airborne campaigns, using the model and the IASI averaging kernels to compute aircraft-based columns directly comparable to IASI data. IASI is found to underestimate high columns in the considered region. A linear regression gives ΩIASI=0.46Ωairc+10.6×1015molec.cm-2, with ΩIASI and Ωairc the IASI and aircraft-derived columns, respectively. Inverse modelling of terrestrial methanol emissions using MAGRITTE and bias-corrected IASI columns leads to much-improved overall agreement against in situ measurement campaigns and column data at eight FTIR stations. The optimised global biogenic methanol emissions (∼160Tgyr-1) are 22 %–60 % higher than previous top-down estimates, due to (1) column enhancements caused by the IASI bias-correction and (2) higher dry deposition velocities in the model over land, compared to previous model studies, based on a parametrisation constrained by extensive campaign data. The inversion results are less reliable over boreal forests due to shortcomings of both the bias-correction and the dry deposition scheme over these regions. The optimisation suggests large changes in the distribution and seasonality of emissions. Over tropical ecosystems, radiation and temperature appear to exert a stronger control on biogenic emissions than is currently accounted for in the MEGAN model.

Research Center/Unit :

SPHERES - ULiège

Disciplines :

Earth sciences & physical geography

Author, co-author :

Müller, Jean-François

Stavrakou, Trissevgeni

Franco, Bruno

Clarisse, Lieven

Amelynck, Crist

Schoon, Niels

Verreyken, Bert

Opacka, Beata

Vigouroux, Corinne

Guenther, Alex B.

More authors (3 more)

Language :

English

Title :

Global atmospheric methanol emissions inferred from IASI satellite measurements and aircraft data

Publication date :

22 April 2026

Journal title :

Atmospheric Chemistry and Physics

ISSN :

1680-7316

eISSN :

1680-7324

Publisher :

Copernicus GmbH

Volume :

Issue :

Pages :

5375-5406

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://acp.copernicus.org/articles/26/5375/2026/acp-26-5375-2026.pdf

Funders :

ESA - European Space Agency
DG ENV - European Commission. Directorate-General for Environment
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Office Fédéral de Météorologie et de Climatologie MétéoSuisse

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