Global atmospheric inversion of the anthropogenic NH3 emissions over 2019-2022 using the LMDZ-INCA chemistry transport model and the IASI NH3 observations
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Authors
Kumar, P.
Broquet, G.
Hauglustaine, D.
Beaudor, M.
Clarisse, L.
Van Damme, M.
Coheur, P.
Cozic, A.
Zheng, B.
Revilla Romero, B.
Delavois, A.
Ciais, P.
Discipline
Earth and related Environmental sciences
Audience
Scientific
Date
2025Metadata
Show full item recordDescription
Ammonia (NH3) emissions have been on a continuous rise due to extensive fertilizer usage in agriculture and increasing production of manure and livestock. However, the current global-to-national NH3 emission inventories exhibit large uncertainties. We provide atmospheric inversion estimates of the global NH3 emissions over 2019–2022 at 1.27° × 2.5° horizontal and daily (at 10 d scale) resolution. We use IASI-ANNI-NH3-v4 satellite observations, simulations of NH3 concentrations with the chemistry transport model LMDZ-INCA, and the finite difference mass-balance approach for inversions of global NH3 emissions. We take advantage of the averaging kernels provided in the IASI-ANNI-NH3-v4 dataset by applying them consistently to the LMDZ-INCA NH3 simulations for comparison to the observations and then to invert emissions. The average global anthropogenic NH3 emissions over 2019–2022 are estimated as ∼97 (94–100) Tg yr−1, which is ∼61 % (∼55 %–65 %) higher than the prior Community Emissions Data System (CEDS) inventory's anthropogenic NH3 emissions and significantly higher than two other global inventories: CAMS's anthropogenic NH3 emissions (by a factor of ∼1.8) and the Calculation of AMmonia Emissions in ORCHIDEE (CAMEO) agricultural and natural soil NH3 emissions (by ∼1.4 times). The global and regional budgets are mostly within the range of other inversion estimates. The analysis provides confidence in their seasonal variability and continental- to regional-scale budgets. Our analysis shows a rise in NH3 emissions by ∼5 % to ∼37 % during the COVID-19 lockdowns in 2020 over different regions compared to the same-period emissions in 2019. However, this rise is probably due to a decrease in atmospheric NH3 sinks due to the decline in NOx and SO2 emissions during the lockdowns.
Citation
Kumar, P.; Broquet, G.; Hauglustaine, D.; Beaudor, M.; Clarisse, L.; Van Damme, M.; Coheur, P.; Cozic, A.; Zheng, B.; Revilla Romero, B.; Delavois, A.; Ciais, P. (2025). Global atmospheric inversion of the anthropogenic NH3 emissions over 2019-2022 using the LMDZ-INCA chemistry transport model and the IASI NH3 observations. , Atmospheric Chemistry and Physics, Vol. 25, Issue 19, 12379-12407, DOI: 10.5194/acp-25-12379-2025.Identifiers
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Type
Article
Peer-Review
Yes
Language
eng