4D-Var inversion of European NH3 emissions using CrIS NH3 measurements and GEOS-Chem adjoint with bi-directional and uni-directional flux schemes
| Autor: | Hansen Cao, Daven K. Henze, Liye Zhu, Mark W. Shephard, Karen Cady‐Pereira, Enrico Dammers, Michael Sitwell, Nicholas Heath, Chantelle Lonsdale, Jesse O. Bash, Kazuyuki Miyazaki, Christophe Flechard, Yannick Fauvel, Roy Wichink Kruit, Stefan Feigenspan, Christian Brümmer, Frederik Schrader, Marsailidh M. Twigg, Sarah Leeson, Yuk S. Tang, Amy C. M. Stephens, Christine Braban, Keith Vincent, Mario Meier, Eva Seitler, Camilla Geels, Thomas Ellermann, Agnieszka Sanocka, Shannon L. Capps |
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| Rok vydání: | 2021 |
| Předmět: |
Atmospheric Science
bi-directional flux scheme uni-directional flux scheme NITROGEN DEPOSITION SPATIAL VARIABILITY AIR-QUALITY AMMONIA EMISSIONS VEHICLE EMISSIONS UNITED-STATES inverse modeling NH emissions AGRICULTURAL EMISSIONS Atmospheric Sciences DRY DEPOSITION Geophysics Space and Planetary Science 4D-Var Earth and Planetary Sciences (miscellaneous) REACTIVE NITROGEN CrIS NH BIOSPHERE-ATMOSPHERE EXCHANGE |
| Zdroj: | Cao, H, Henze, D K, Zhu, L, Shephard, M W, Cady-Pereira, K, Dammers, E, Sitwell, M, Heath, N, Lonsdale, C, Bash, J O, Miyazaki, K, Flechard, C, Fauvel, Y, Kruit, R W, Feigenspan, S, Brümmer, C, Schrader, F, Twigg, M M, Leeson, S, Tang, Y S, Stephens, A C M, Braban, C, Vincent, K, Meier, M, Seitler, E, Geels, C, Ellermann, T, Sanocka, A & Capps, S L 2022, ' 4D-Var Inversion of European NH 3 Emissions Using CrIS NH 3 Measurements and GEOS-Chem Adjoint With Bi-Directional and Uni-Directional Flux Schemes ', Journal of Geophysical Research: Atmospheres, vol. 127, no. 9, e2021JD035687 . https://doi.org/10.1029/2021JD035687 |
| Popis: | We conduct the first 4D-Var inversion of NH3 accounting for NH3 bi-directional flux, using CrIS satellite NH3 observations over Europe in 2016. We find posterior NH3 emissions peak more in springtime than prior emissions at continental to national scales, and annually they are generally smaller than the prior emissions over central Europe, but larger over most of the rest of Europe. Annual posterior anthropogenic NH3 emissions for 25 European Union members (EU25) are 25% higher than the prior emissions and very close (3 fluxes as uni-directional emissions, while the monthly regional difference can be up to 34% (Switzerland in July). Compared to monthly mean in-situ observations, our posterior NH3 emissions from both schemes generally improve the magnitude and seasonality of simulated surface NH3 and bulk NHx wet deposition throughout most of Europe, whereas evaluation against hourly measurements at a background site shows the bi-directional scheme better captures observed diurnal variability of surface NH3. This contrast highlights the need for accurately simulating diurnal variability of NH3 in assimilation of sun-synchronous observations and also the potential value of future geostationary satellite observations. Overall, our top-down ammonia emissions can help to examine the effectiveness of air pollution control policies to facilitate future air pollution management, as well as helping us understand the uncertainty in top-down NH3 emissions estimates associated with treatment of NH3 surface exchange. |
| Databáze: | OpenAIRE |
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