Science Inventory

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Schwede, D., D. Luecken, AND Johnt Walker. Improvements to the treatment of organic nitrogen chemistry & deposition in CMAQ. 2015 American Meteorological Society Meeting, Phoenix, AZ, January 05 - 09, 2015.

Walker, Johnt. Measurement and modeling of the contribution of ammonia to total nitrogen deposition from canopy to regional scale. Presented at American Meteorological Society, phoenix, AZ, January 04 - 08, 2015.

Bash, J., John T. Walker, M. Shepard, K. Cady-Pereira, D. Henze, D. Schwede, L. Zhu, AND E. Cooter. Modeling reactive nitrogen in North America: recent developments, observational needs and future directions. ENVIRONMENTAL MANAGER. Air & Waste Management Association, Pittsburgh, PA, , 36-42, (2015).

Schichtel, B. AND Johnt Walker. Reactive Nitrogen Monitoring Gaps: Issues, Activities and Needs. ENVIRONMENTAL MANAGEMENT. Springer-Verlag, New York, NY, 65:12-19, (2015).

Luo, M., M. Shephard, K. Cady-Pereira, D. Henze, L. Zhu, J. Bash, R. Pinder, S. Capps, J. Walker, AND M. Jones. Satellite observations of tropospheric ammonia and carbon monoxide: Global distributions, regional correlations and comparisons to model simulations. ATMOSPHERIC ENVIRONMENT. Elsevier Science Ltd, New York, NY, 106:262-277, (2015).

Yu, F., G. Luo, S. Pryor, P. Pillai, S. Lee, J. Ortega, J. Schwab, A. Hallar, W. Leaitch, V. Aneja, J. Smith, Johnt Walker, O. Hogrefe, AND K. Demerjian. Spring and summer contrast in new particle formation over nine forest areas in North America. Atmospheric Chemistry and Physics. Copernicus Publications, Katlenburg-Lindau, Germany, 15(24):13993-14003, (2015).

Rumsey, I., K. A. Cowen, Johnt Walker, T. J. Kelly, E. A. Hanft, K. Mishoe, C. Rogers, R. Proost, G. M. Beachley, G. Lear, T. Frelink, AND R. P. Otjes. An assessment of the performance of Monitor for AeRosols and GAses in ambient air (MARGA): a semi-continuous method for soluble compounds. Atmospheric Chemistry and Physics. Copernicus Publications, Katlenburg-Lindau, Germany, 14:5639-5658, (2014).

Walker, Johnt, D. Schwede, J. Bash, AND C. Oishi. Comparison of Aerodynamic Resistance Parameterizations and Implications for Dry Deposition Modeling. National Atmospheric Deposition Program, Indianapolis, IN, October 22 - 24, 2014.

Schwede, D., D. Luecken, Johnt Walker, AND G. Pouliot. Improvements to the Characterization of Organic Nitrogen Chemistry. National Atmospheric Deposition Program Fall 2014 Scientific Symposium, Indiana, IN, October 22 - 23, 2014.

Schwede, D., D. Luecken, Johnt Walker, G. Pouliot, AND W. Appel. Improvements to the characterization of organic nitrogen chemistry and deposition in CMAQ (CMAS Presentation). Community Modeling & Analysis CMAS, Chapel Hill, NC, October 27 - 29, 2014.

Walker, Johnt, W. Robarge, AND R. Austin. Modeling of Ammonia Dry Deposition to a Pocosin Landscape Downwind of a Large Poultry Facility. AGRICULTURE, ECOSYSTEMS & ENVIRONMENT. Elsevier Science Ltd, New York, NY, 185(0):161-175, (2014).

WALKER, JR., J. T., W. P. Robarge, AND R. Austin. Modeling of ammonia dry deposition downwind of a large poultry facility. SCIENCE. American Association for the Advancement of Science (AAAS), Washington, DC, 185:161-175, (2011).

Walker, Johnt. Bias in modeled bi-directional NH3 fluxes associated with temporal averaging of atmospheric NH3 concentrations. Spring meeting of the National Atmospheric Deposition Program, Madison, WI, April 22 - 25, 2013.

Pleim, Jon, J. Bash, Johnt Walker, AND E. Cooter. Development and evaluation of an ammonia bidirectional flux parameterization for air quality models. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 118(9):3794-3806, (2013).

Novick, K., Johnt Walker, S. Chan, C. Sobek, AND J. Vose. Eddy covariance measurements in complex terrain with a new fast response, closed-path analyzer: spectral characteristics and cross-system comparisons. AGRICULTURAL AND FOREST METEOROLOGY. Elsevier Science Ltd, New York, NY, 181:17-32, (2013).

George, I., R. Black, Johnt Walker, M. Hays, D. Tabor, AND B. Gullett. Emissions of volatile organic compounds and particulate matter from small-scale peat fire. American Geophysical Union Fall Meeting, San Francisco, CA, December 09 - 13, 2013.

George, I., R. Black, Johnt Walker, M. Hays, B. Preston, D. Tabor, AND B. Gullett. Emissions of volatile organic compounds and particulate matter from small-scale peat fires. American Geophysical Union Fall Meeting, San Francisco, CA, December 09 - 13, 2013.

Bash, J., E. Cooter, R. Dennis, Johnt Walker, AND Jon Pleim. Evaluation of a regional air-quality model with bidirectional NH₃ exchange coupled to an agroecosystem modelecosystem model. Biogeosciences. Copernicus Publications, Katlenburg-Lindau, Germany, 10(3):1635-1645, (2013).

Pillai, P., A. Khlystov, Johnt Walker, AND V. Aneja. Observation and Analysis of Particle Nucleation at a Forest Site in Southeastern US. Atmospheric Pollution Research. Turkish National Committee for Air Pollution Research and Control, Izmir, Turkey, 4(2):72-93, (2013).

Walker, Johnt, M. Jones, J. Bash, L. Myles, T. Meyers, D. Schwede, J. Herrick, E. Nemitz, AND W. Robarge. Processes of Ammonia Air-Surface Exchange in a Fertilized Zea Mays Canopy. Biogeosciences. Copernicus Publications, Katlenburg-Lindau, Germany, 10(2):981-998, (2013).

Samy, S., J. Robinson, I. Rumsey, Johnt Walker, AND M. Hays. Speciation and Trends of Organic Nitrogen in Southeastern U.S. Fine Particulate Matter (PM2.5). JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 118(4):1996-2006, (2013).

Sutton, M., S. Reis, S. Riddick, U. Dragosits, E. Nemitz, M. Theobald, Y. Tang, C. Braban, M. Vieno, A. Dore, R. Mitdhell, S. Wanless, F. Daunt, D. Fowler, T. Blackall, C. Milford, C. Flechard, B. Loubet, R. Massad, P. Cellier, E. Personne, P. Coheur, L. Clarisse, M. van Damme, Y. Ngadi, C. Clebaux, C. Skjoth, C. Geels, O. Hertel, R. Wickink Kruit, R. Pinder, J. Bash, Johnt Walker, D. Simpson, L. Horvath, T. Misselbrook, A. Bleeker, F. Dentener, AND W. de Vries. Towards a climate-dependent paradigm of ammonia emission and deposition. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON. Royal Society, London, Uk, 368(1621):01666, (2013).

Theobald, M. R., P. Lofstrom, J. T. WALKER, JR., H. V. Andersen, P. Pedersen, A. Vallejo, AND M. A. Sutton. An intercomparison of models used to simulate the short-range atmospheric dispersion of agricultural ammonia emissions. ENVIRONMENTAL MODELLING AND SOFTWARE. Elsevier Science Ltd, New York, NY, 37:90-102, (2012).