Faculty Publications
A Multiyear Constraint On Ammonia Emissions And Deposition Within The US Corn Belt
Document Type
Article
Keywords
agriculture, ammonia emissions, deposition, forests, mitigation, reactive nitrogen, tall tower, US Corn Belt, WRF-Chem modeling
Journal/Book/Conference Title
Geophysical Research Letters
Volume
48
Issue
6
Abstract
The US Corn Belt is a global hotspot of atmospheric ammonia (NH3), a gas known to adversely impact the environment and human health. We combine hourly tall tower (100 m) measurements and bi-weekly, spatially distributed, ground-based observations from the Ammonia Monitoring Network with the US National Emissions Inventory (NEI) and WRF-Chem simulations to constrain NH3 emissions from April to September 2017–2019. We show that: (1) NH3 emissions peaked from May to July and were 1.6–1.7 times the annual NEI average; (2) average growing season NH3 emissions from agricultural lands were remarkably similar across years (3.27–3.64 nmol m−2 s−1), yet showed substantial episodic variability driven by meteorology and land management; (3) dry deposition was 40% of gross emissions from agricultural lands and exceeded 100% of gross emissions in natural lands. Our findings provide an important benchmark for evaluating future NH3 emissions and mitigation efforts.
Department
Department of Earth and Environmental Sciences
Original Publication Date
3-28-2021
DOI of published version
10.1029/2020GL090865
Repository
UNI ScholarWorks, Rod Library, University of Northern Iowa
Language
en
Recommended Citation
Hu, Cheng; Griffis, Timothy J.; Frie, Alexander; Baker, John M.; Wood, Jeffrey D.; Millet, Dylan B.; Yu, Zhongjie; Yu, Xueying; and Czarnetzki, Alan C., "A Multiyear Constraint On Ammonia Emissions And Deposition Within The US Corn Belt" (2021). Faculty Publications. 94.
https://scholarworks.uni.edu/facpub/94