[HTML][HTML] High-resolution hybrid inversion of IASI ammonia columns to constrain US ammonia emissions using the CMAQ adjoint model

Y Chen, H Shen, J Kaiser, Y Hu… - Atmospheric …, 2021 - acp.copernicus.org
Ammonia (NH 3) emissions have large impacts on air quality and nitrogen deposition,
influencing human health and the well-being of sensitive ecosystems. Large uncertainties …

Atmospheric deposition of reactive nitrogen to a deciduous forest in the southern Appalachian Mountains

JT Walker, X Chen, Z Wu, D Schwede… - Biogeosciences …, 2022 - bg.copernicus.org
Assessing nutrient critical load exceedances requires complete and accurate atmospheric
deposition budgets for reactive nitrogen (N r). The exceedance is the total amount of N r …

Toward the improvement of total nitrogen deposition budgets in the United States

JT Walker, G Beachley, HM Amos, JS Baron… - Science of the Total …, 2019 - Elsevier
Frameworks for limiting ecosystem exposure to excess nutrients and acidity require accurate
and complete deposition budgets of reactive nitrogen (Nr). While much progress has been …

Review of methods for assessing deposition of reactive nitrogen pollutants across complex terrain with focus on the UK

N Cowan, E Nemitz, JT Walker, D Fowler… - Environmental …, 2022 - pubs.rsc.org
This review is a summary of the most up-to-date knowledge regarding assessment of
atmospheric deposition of reactive nitrogen (Nr) pollutants across complex terrain in the UK …

Aspects of uncertainty in total reactive nitrogen deposition estimates for North American critical load applications

JT Walker, MD Bell, D Schwede, A Cole… - Science of the Total …, 2019 - Elsevier
Determination of the amount of reactive nitrogen (Nr) deposition in excess of the ecosystem
critical load (CL) requires an estimate of total deposition. Because the CL exceedance is …

Spatial Distribution of Ammonia Concentrations and Modeled Dry Deposition in an Intensive Dairy Production Region

AB Leytem, JT Walker, Z Wu, K Nouwakpo, C Baublitz… - Atmosphere, 2023 - mdpi.com
Agriculture generates~ 83% of total US ammonia (NH3) emissions, potentially adversely
impacting sensitive ecosystems through wet and dry deposition. Regions with intense …

Nitrogen deposition sources and patterns in the Greater Yellowstone Ecosystem determined from ion exchange resin collectors, lichens, and isotopes

AS Hoffman, SE Albeke, JA McMurray… - Science of the Total …, 2019 - Elsevier
Over the past century, atmospheric nitrogen deposition (N dep) has increased across the
western United States due to agricultural and urban development, resulting in degraded …

Chemical Effects of Snowmelt on an Alpine Lake in the Wind River Range, WY

TR Ganz, J McMurray, K Covey, C Bettigole… - Water, Air, & Soil …, 2021 - Springer
Nitrogen deposition from air pollution is increasingly reaching alpine lakes where the
addition of nitrate and ammonium to sensitive surface waters can cause acidification and/or …