Decreasing trends of NH3 over Europe seen from space

0572062 - ÚTIA 2024 DE eng A - Abstrakt
Evangeliou, N. - Tichý, Ondřej - Eckhardt, S. - Balkanski, Y. - Hauglustaine, D.
Decreasing trends of NH3 over Europe seen from space.
EGU General Assembly 2023. Munich: The European Geosciences Union, 2023.
[EGU General Assembly 2023. 23.04.2023-28.04.2023, Vídeň]
Klíčová slova: NH3
http://library.utia.cas.cz/separaty/2023/AS/tichy-0572062.pdf

In the present study, we use direct comparisons between the CrIS (Cross-track Infrared Sounder ) observations and model retrievals using the Least Squares with Adaptive Prior Covariance (LS-APC) algorithm, which reduces the number of tuning parameters in the method significantly using variational Bayes approximation technique. We constrain ammonia emissions over Europe over 2013–2020 and validate the results against ground-based observations from the EMEP (European Monitoring and Evaluation Programme). We find that emissions of ammonia decreased from 5431 Gg in 2013 to 3994 Gg in 2020 (-26%). Regionally, emissions declined by 38% in Central and Eastern Europe, 37% in Western Europe, 8% in Southern Europe and -17% in Northern Europe.
Trvalý link: https://hdl.handle.net/11104/0342938