You are here:
National Risk Management Research Laboratory (NRMRL) Research Publications
Widen Your Search
Records 1 to 25 of 32 records from ORD-NRMRL published between 10/07/2012 and 10/07/2017 from author John Walker, Jr.
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).
Wu, Z., Johnt Walker, AND L. Zhang. Development, evaluation and application of a modified micrometeorological gradient method for long-term estimation of gaseous dry deposition over forest canopies. Presented at Ozone Dry Deposition: Constraints from multiplatform observations and multi-scale modeling, Palisades, CA, October 05 - 06, 2017.
Duman, T., Johnt Walker, J. Bash, K. Gannam, C. Huang, K. Andrey, AND G. Katul. Estimating sources, sinks and fluxes of reactive atmospheric compounds within a forest canopy. 2015 American Geophysical Union, San Francisco, CA, December 14 - 18, 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).
Chen, X., Johnt Walker, AND Chris Geron. Laboratory and field based evaluation of chromatography related performance of the Monitor for Aerosols and Gases in Ambient Air (MARGA). Presented at National Atmospheric Deposition Program Fall Meeting, Santa Fe, New Mexico, October 31 - November 04, 2016.
Sullivan, R., P. Crippa, A. Hallar, L. Clarisse, S. Whitburn, M. Van Damme, W. Leaitch, Johnt Walker, A. Khlystov, AND S. Pryor. Using satellite-based measurements to explore spatiotemporal scales and variability of drivers of new particle formation. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES. American Geophysical Union, Washington, DC, 121(20):12217-12235, (2016).
Beaulieu, J., B. Deemer, J. Harrison, C. Nietch, S. Waldo, AND Johnt Walker. Accounting For Greenhouse Gas Emissions From Flooded Lands. Presented at AGU Fall Meeting, San Francisco, CA, December 12 - 16, 2016.
Waldo, S., J. Beaulieu, AND Johnt Walker. Investigating physical controls on methane and carbon dioxide fluxes over reservoirs using the eddy covariance method-abstract. AGU Fall Meeting, San Francisco, CA, December 12 - 16, 2016.
Walker, Johnt, X. Chen, D. Schwede, R. Daly, A. Djurkovic, D. Kirchgessner, C. Oishi, AND M. Puchalski. Investigation of ammonia air-surface exchange processes in a deciduous montane forest in the southeastern U.S. Presented at National Atmospheric Deposition Program Fall Meeting, Santa Fe, New Mexico, October 31 - November 04, 2016.
Beaulieu, J., C. Nietch, S. Waldo, AND Johnt Walker. Methane emissions from reservoirs. To be Presented at Ohio River Basin Water Quality Workshop, Cincinnati, Ohio, December 06 - 08, 2016.
Waldo, S., J. Beaulieu, AND Johnt Walker. Investigating physical controls on methane and carbon dioxide fluxes over reservoirs using the eddy covariance method. Presented at American Geophysical Union Fall Meeting, San Francisco, CA, December 12 - 16, 2016.
George, I., R. Black, Johnt Walker, Chris Geron, J. Aurell, M. Hays, W. Preston, AND B. Gullett. Volatile and semivolatile organic compounds in laboratory peat fire emissions. ATMOSPHERIC ENVIRONMENT. Elsevier Science Ltd, New York, NY, 132:163-170, (2016).
Walker, Johnt AND A. Leytem. USDA-EPA Collaborative Ammonia Research. Presented at USDA Agricultural Air Quality Task Force, Arlington, VA, April 07, 2016.
Walker, Johnt. The Measurement and modeling of the contribution of ammonia to total nitrogen deposition from canopy to regional scale. Presented at Invited Seminar - College of Charleston, Charleston, SC, March 03, 2016.
Li, Y., B. Schichtel, Johnt Walker, D. Schwede, X. Chen, C. Lehmann, M. Puchalski, D. Gay, AND J. Collett, Jr. The Increasing Importance of Deposition of Reduced Nitrogen in the United States. PNAS (PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES). National Academy of Sciences, WASHINGTON, DC, 113(21):5874-5879, (2016).
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.
Rumsey, I. C. AND J. T. WALKER. Application of an online ion chromatography-based instrument for gradient flux measurements of speciated nitrogen and sulfur. Atmospheric Measurement Techniques. Copernicus Publications, Katlenburg-Lindau, Germany, 9(6):2581-2592, (2016).
Oishi, C., C. Miniat, K. Novick, S. Brantley, J. Vose, AND Johnt Walker. Climate and Vegetation Effects on Temperate Mountain Forest Evapotranspiration. Presented at 2015 American Geophysical Union Annual Meeting, San Francisco, CA, December 14 - 18, 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).
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.
Almand-Hunter, B., Johnt Walker, N. Masson, L. Hafford, AND M. Hannigan. Development and validation of inexpensive, automated, dynamic flux chambers. Atmospheric Measurement Techniques. Copernicus Publications, Katlenburg-Lindau, Germany, 8(1):267-280, (2015).
Spence, P., Johnt Walker, W. Robarge, B. Preston, AND D. Osmond. Comparing Nitrous Oxide Emissions from Three Residential Landscapes under Different Management Schemes Following Natural Rainfall Events. Urban Ecosystems. Springer Science+Business Media B.V, Dordrecht, Netherlands, 18:1-17, (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).
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. 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.