Science Inventory

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Baublitz, C., JohnT Walker, J. Bash, AND Z. Wu. Observation-based estimate of field-scale dry deposition across the U.S. Ammonia Monitoring Network (AMoN). American Meteorological Society Annual Conference, Denver, CO, January 08 - 12, 2023.

Offenberg, J., M. Puchalski, AND JohnT Walker. Presentation of Results of PFAS wet deposition measurements at 2023 Tribal Environmental Program Management Conference. Results from analysis of PFAS in excess waters collected at select National Atmospheric Deposition Network - National Trends Network (NADP-NTN) sites to be presented at the 2023 2023 Tribal Environmental Program Management Conference, chicago, IL, March 14 - 16, 2023.

Bash, J., JohnT Walker, V. Rao, Z. Wu, C. Baublitz, AND I. Rumsey. Updates to Fertilizer and Biogenic NH3 emissions for the National Emissions Inventory. 2023 International Emissions Inventory Conference, Seattle, WA, September 26 - 29, 2023.

Alapaty, K., B. Cheng, J. Bash, J. Munger, J. Walker, AND S. Arunachalam. Dry Deposition Methods Based on Turbulence Kinetic Energy: 1. Evaluation of Various Resistances and Sensitivity Studies Using a Single-Point Model. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 127(22):e2022JD036631, (2022). https://doi.org/10.1029/2022JD036631

Topie, N., J. Walker, AND S. Fulgham. Efforts to Quantify Water-Soluble Organic Nitrogen (WSON) on CASTNET Teflon filters. NADP Spring Meeting, Madison, Wisconsin, April 19 - 22, 2022.

Bash, J., C. Hogrefe, B. Cheng, K. Alapaty, J. Walker, D. Schwede, AND O. Clifton. Evaluation and improvement of the Surface Tiled Aerosol and Gaseous Exchange (STAGE) resistance model with long term ozone fluxes at multiple sites. AMS 2022, Virtual, TX, January 23 - 27, 2022.

Offenberg, J., M. Puchalski, JohnT Walker, d. burns, a. johnson, AND M. Shafer. Initial assessment of a pilot program for measuring Per- and Poly-fluorinated Substances (PFAS) in wet deposition in the eastern United States. National Tribal Forum on Air Qualtiy, Tulsa, OK, May 02 - 05, 2022.

Walker, JohnT, J. Knoepp, M. Puchalski, J. Iiames, C. Miniat, X. Chen, Z. Wu, D. Schwede, J. Bash, R. Daly, A. Djurkovic, C. Oishi, AND E. Edgerton. Atmospheric Deposition of Reactive Nitrogen to a Southern Appalachian Deciduous Forest. UNAM Centro de Ciencias de la Atmosfera Seminar Series, Mexico City, MEXICO, April 09, 2021.

Wu, Z., J. Walker, C. Oishi, G. Katul, T. Duman, X. Chen, D. Schwede, J. Bash, AND J. Iiames. Estimating sources, sinks, and fluxes of reactive nitrogen and sulfur within a mixed forest canopy. Spring 2021 National Atmospheric Deposition Program/Total Deposition Science Committee, Virtual, Virtual, May 10 - 14, 2021.

Wu, Z., L. Zhang, J. Walker, P. Makar, J. Perlinger, AND X. Wang. Extension of a gaseous dry deposition algorithm to oxidized volatile organic compounds and hydrogen cyanide for application in chemistry transport models. Journal of Advances in Modeling Earth Systems. John Wiley & Sons, Inc., Hoboken, NJ, 14(8):5093-5105, (2021). https://doi.org/10.5194/gmd-14-5093-2021

Rogers, C., K. Mishoe, M. Stewart, K. Barry, J. Rice, X. Chen, JohnT Walker, M. Puchalski, R. Baumgardner, AND B. Schichtel. Improving characterization of reduced nitrogen at IMPROVE and CSN monitoring sites. U.S. Environmental Protection Agency, Washington, DC, 2021.

Alapaty, Kiran, B. Cheng, J. Bash, w. Munger, JohnT Walker, AND S. Arunachalam. Introducing Turbulence Kinetic Energy to Dry Deposition Modeling. American Geophysical Union Fall Meeting, New Orleans, On-Line/Everywhere, December 13 - 17, 2021.

Walker, JohnT, R. Daly, A. Djurkovic, Z. Wu, S. Fulgham, AND M. Barnes. Measurements of air-surface exchange of reactive nitrogen. Board of Scientific Counselors, Durham, NC, February 17 - 19, 2021.

Bash, J., V. Rao, JohnT Walker, M. Shephard, AND K. Cady-Pereira. Modeling Emissions, Transport, and Fate of Atmospheric Ammonia in CMAQ Simulations for the Chesapeake Bay Program. DLLC Ammonia Emissions Webinar, Durham, North Carolina, February 17, 2021.

Leytem, A., Z. Wu, JohnT Walker, J. Bash, AND G. Beachley. Nitrogen Deposition in the Snake River Valley. National Atmospheric Deposition Program Fall 2021 Total Deposition Science Committee Meeting, Virtual, Virtual, October 26, 2021.

Wu, Z., JohnT Walker, R. Saylor, L. Zhang, J. Bash, B. Place, AND E. Delaria. State of the science and future direction of air-surface exchange models for reactive compounds. National Atmospheric Deposition Program Fall 2021 Science Symposium, Virtual, Virtual, October 25 - 29, 2021.

Waldo, S., J. Beaulieu, W. Barnett, A. Balz, M. Vanni, T. Williamson, AND JohnT Walker. Temporal trends in methane emissions from a small eutrophic reservoir: the key role of a spring burst. Biogeosciences. Copernicus Publications, Katlenburg-Lindau, Germany, 18(19):5291-5311, (2021). https://doi.org/10.5194/bg-18-5291-2021

Walker, JohnT, G. Beachley, AND S. Isil. 2019 NADP Total Deposition Science Committee Agricultural Workshop: “Connecting stakeholder and science perspectives to better understand the linkages between agriculture and reactive nitrogen deposition”. In Proceedings, Connecting stakeholder and science perspectives to better understand the linkages between agriculture and reactive nitrogen deposition, Boulder, CO, NC, November 04, 2019. University of Wisconsin, Madison, WI, 1-113, (2020).

Walker, J., G. Beachley, L. Zhang, K. Benedict, B. Sive, AND D. Schwede. A review of measurements of air-surface exchange of reactive nitrogen in natural ecosystems across North America. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier BV, AMSTERDAM, Netherlands, 698:133975, (2020).

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.

Guo, X., D. Pan, R. Daly, X. Chen, JohnT Walker, L. Tao, J. McSpiritt, AND M. Zondlo. Eddy Covariance Measurements of Ammonia Fluxes in a Deciduous Forest and Adjacent Grassland. 2020 Fall AGU Meeting, Durham, NC, December 01 - 17, 2020.

Offenberg, J., JohnT Walker, M. Puchalski, d. burns, A. Johnson, AND m. shafer. NADP Fall Meeting 2020 Presentation: Initiation of Sampling for PFAS in Eastern US. NADP Fall 2020 Meeting, Virtual, Wisconsin, October 28 - 30, 2020.

Walker, JohnT, M. Bell, A. Cole, G. Beachley, G. Lear, AND Z. Wu. NADP/TDep webinar series: Assessing uncertainty in total reactive nitrogen deposition estimates for North American critical load applications. NADP/TDep webinar series, NA, NC, April 15, 2020.

Pye, H., A. Nenes, B. Alexander, A. Ault, M. Barth, S. Clegg, J. Collett, K. Fahey, C. Hennigan, H. Herrmann, M. Kanakidou, J. Kelly, I. Ku, V. McNeill, N. Riemer, T. Schaefer, G. Shi, A. Tilgner, J. Walker, T. Wang, R. Weber, J. Xing, R. Zaveri, AND A. Zuend. The Acidity of Atmospheric Particles and Clouds. Atmospheric Chemistry and Physics. Copernicus Publications, Katlenburg-Lindau, Germany, 20(8):4809–4888, (2020). https://doi.org/10.5194/acp-20-4809-2020

Walker, J., M. Bell, D. Schwede, A. Cole, G. Beachley, G. Lear, AND W. Zhiyong. Aspects of inventory in total reactive nitrogen deposition estimates for North American critical load appplication. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier BV, AMSTERDAM, Netherlands, 690:1005-1018, (2019). https://doi.org/10.1016/j.scitotenv.2019.06.337