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4D-Var Inversion of European NH Emissions Using CrIS NH Measurements and GEOS-Chem Adjoint With Bi-Directional and Uni-Directional Flux Schemes
Journal article   Open access   Peer reviewed

4D-Var Inversion of European NH Emissions Using CrIS NH Measurements and GEOS-Chem Adjoint With Bi-Directional and Uni-Directional Flux Schemes

Hansen Cao, Daven K Henze, Liye Zhu, Mark W Shephard, Karen Cady-Pereira, Enrico Dammers, Michael Sitwell, Nicholas Heath, Chantelle Lonsdale, Jesse O Bash, …
Journal of geophysical research Atmospheres, v 127(9), e2021JD035687
04 Mar 2023
DOI: https://doi.org/10.1029/2021JD035687
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1029/2021jd035687View
Published, Version of Record (VoR) Open CC BY-NC-ND V4.0
url
https://doi.org/10.1029/2021JD035687View
Published, Version of Record (VoR) Open

Abstract

4D‐Var bi‐directional flux scheme CrIS NH3 inverse modeling NH3 emissions uni‐directional flux scheme
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 (<2% difference) to other inventories. Our posterior annual anthropogenic emissions for EU25, the UK, the Netherlands, and Switzerland are generally 10%-20% smaller than when treating NH3 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 NH x 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.

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23 citations in Web of Science
14 citations in Scopus

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This publication has contributed to the advancement of the following goals:

#11 Sustainable Cities and Communities
#13 Climate Action
#3 Good Health and Well-Being

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Industry collaboration
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Web of Science research areas
Meteorology & Atmospheric Sciences
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