UK Ammonia Emissions Estimated With Satellite Observations and GEOS‐Chem

Marais, Eloise and Pandey, Alok Kumar and Van Damme, Martin and Clarisse, Lieven and Coheur, Pierre-Francois and Shephard, Mark W. and Cady-Pereira, Karen E. and Misselbrook, Tom and Zhu, Lei and Luo, Gan and Yu, Fangqun (2021) UK Ammonia Emissions Estimated With Satellite Observations and GEOS‐Chem. Journal of Geophysical Research: Atmospheres, 126 (18). ISSN 0747-7309

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Agricultural emissions of ammonia (NH 3) impact air quality, human health, and the vitality of aquatic and terrestrial ecosystems. In the UK, there are few direct policies regulating anthropogenic NH 3 emissions and development of sustainable mitigation measures necessitates reliable emissions estimates. Here, we use observations of column densities of NH 3 from two space-based sensors (IASI and CrIS) with the GEOS-Chem model to derive top-down NH 3 emissions for the UK at fine spatial (∼10 km) and time (monthly) scales. We focus on March-September when there is adequate spectral signal to reliably retrieve NH 3. We estimate total emissions of 272 Gg from IASI and 389 Gg from CrIS. Bottom-up emissions are 27% less than IASI and 49% less than CrIS. There are also differences in seasonality. Top-down and bottom-up emissions agree on a spring April peak due to fertilizer and manure application, but there is also a comparable summer July peak in the top-down emissions that is not in the bottom-up emissions and appears to be associated with dairy cattle farming. We estimate relative errors in the top-down emissions of 11%–36% for IASI and 9%–27% for CrIS, dominated by column density retrieval errors. The bottom-up versus top-down emissions discrepancies estimated in this work impact model predictions of the environmental damage caused by NH 3 emissions and warrant further investigation.

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Journal Article
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Journal of Geophysical Research: Atmospheres
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27 Jul 2022 10:35
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15 Sep 2023 01:27