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Application of a bidirectional ammonia air-surface exchange model at NADP AMoN sites
Citation:
Walker, JohnT, Z. Wu, A. Djurkovic, R. Daly, R. Baumgardner, D. Schwede, J. Bash, T. Macy, M. Puchalski, S. Isil, K. Mishoe, AND M. Stewart. Application of a bidirectional ammonia air-surface exchange model at NADP AMoN sites. NADP Total Deposition Science Committee Webinar Series, Durham, NC, March 18, 2020.
Impact/Purpose:
Deposition assessments that require information on the magnitude and spatiotemporal patterns of ammonia dry deposition currently rely on limited direct flux measurements and output from gridded chemical transport models. Measurements of two-week integrated ammonia air concentrations provided by National Atmospheric Deposition Program’s (NADP) Ammonia Monitoring Network (AMoN) network represent a potentially valuable dataset for estimating ecosystem specific ammonia fluxes via bidirectional flux modeling. However, several aspects of such a modeling framework, specific to the use of time integrated measurements, choice of meteorological input, and complexity of biogeochemical parameterizations, must be addressed prior to implementation across the network.
Description:
This presentation provides an update on an ongoing OAR/ORD project to develop and evaluate a methodology for using two-week average AMoN concentrations in a bi-directional ammonia flux model framework. Methodologies for development of biogeochemical and meteorological datasets used for model parameterization and evaluation are described and example results are presented. Next steps for model evaluation and implementation are outlined.
