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National Risk Management Research Laboratory (NRMRL) Research Publications
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Records 1 to
25
of 85 records from [ORD-NRMRL] from author John Walker, Jr.
2019
Lichiheb, N., E. Personne, J. Walker, R. Saylor, Z. Wu, X. Chen, D. Schwede, AND C. Oishi. Modeling bi-directional fluxes of NH3 in a forest ecosystem using SURFATM-NH3 model: A study with a dataset from a deciduous montane forest in the southeastern U.S. American Meteorological Society, Phoenix,AZ, January 06 - 11, 2019.
2018
Walker, Johnt, K. Mishoe, C. Rogers, Z. Wu, T. Macy, M. Puchalski, D. Schwede, K. Hutchison, R. Baumgardner, AND W. Robarge. AMoN Site Characterization Study: Phase I Field Measurements. National Atmospheric Deposition Program 2017 Fall Meeting, San Diego, CA, October 30 - November 03, 2017.
Walker, Johnt, M. Bell, D. Schwede, A. Cole, G. Beachley, G. Lear, AND Z. Wu. Assessing uncertainty in total reactive nitrogen deposition estimates for North American critical load applications. National Atmospheric Deposition Program 2018 Fall Science Symposium, Albany, New York, November 07 - 08, 2018.
Nahas, A., Johnt Walker, F. Yelverton, AND V. Aneja. Characterization of Reactive Nitrogen Emissions from Turfgrass. American Geophysical Union, Washington,DC, December 10 - 14, 2018.
Chen, X., M. Xie, M. Hays, E. Edgerton, D. Schwede, AND Johnt Walker. Characterization of organic nitrogen in aerosols at a forest site in the southern Appalachian Mountains. IAC2018, St. Louis, Missouri, September 02 - 07, 2018.
Chen, X., X. Mingjie, M. Hays, E. Edgerton, D. Schwede, AND Johnt Walker. Characterization of organic nitrogen in aerosols at a forest site in the southern Appalachian Mountains. Atmospheric Chemistry and Physics. Copernicus Publications, Katlenburg-Lindau, Germany, 18(9):6829-6846, (2018). https://doi.org/10.5194/acp-18-6829-2018
Waldo, S., J. Beaulieu, W. Barnett, AND Johnt Walker. Comparing near-shore and mid-lake eddy covariance measurements of methane and carbon dioxide fluxes. Presented at Ameriflux PI Meeting 2018, Bloomington, Indiana, October 23 - 25, 2018.
Guo, X., D. Pan, J. McSpiritt, L. Tao, Johnt Walker, R. Daly, AND M. Zondlo. Eddy Covariance-derived Ammonia Emission and Deposition in Adjacent Natural Ecosystems. American Geophysical Union, Washington,DC, December 10 - 14, 2018.
Beaulieu, J., A. Balz, M. Birchfield, J. Harrison, C. Nietch, M. Platz, W. C. SQUIER, S. Waldo, Johnt Walker, K. White, AND J. Young. Effects of an experimental water-level drawdown on methane emissions from a eutrophic reservoir. ECOSYSTEMS. Springer, New York, NY, 21(4):657-674, (2018).
Guo, X., D. Pan, Johnt Walker, R. Daly, AND M. Zondlo. Measurements of Ammonia Emission and Deposition in Adjacent Natural Ecosystems. National Atmospheric Deposition Program, Albany,NY, November 05 - 08, 2018.
Waldo, S., J. Beaulieu, W. Barnett, AND Johnt Walker. Methane Emissions from a Eutrophic Reservoir: Using Non-Linear Models to Gap Fill and Assess Biophysical Drivers. American Meteorological Society Fourth Conference on Biogeosciences, Boise,ID, May 13 - 18, 2018.
Waldo, S., J. Beaulieu, W. Barnett, AND Johnt Walker. Sediment Temperature Control on Methane Ebullition in a Small Eutrophic Reservoir. Presented at American Geophysical Union Fall Metting, Washington, D.C., D.C, December 10 - 14, 2018.
Oishi, C., C. Miniat, K. Novick, S. Brantley, J. Vose, AND Johnt Walker. Warmer Temperatures Reduce Net Carbon Uptake, but Do Not Affect Water Use, in a Mature Southern Appalachian Forest. AGRICULTURAL AND FOREST METEOROLOGY. Elsevier Science Ltd, New York, NY, 252:269-282, (2018).
2017
Chen, X., Johnt Walker, AND Chris Geron. Chromatography related performance of the Monitor for Aerosols and Gases in Ambient Air (MARGA): laboratory and field based evaluation. Atmospheric Measurement Techniques. Copernicus Publications, Katlenburg-Lindau, Germany, 10:3893-3908, (2017). https://doi.org/10.5194/amt-10-3893-2017
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.
Wu, Z., D. Tomer, Johnt Walker, X. Chen, C. Oishi, D. Schwede, AND J. Iiames. Estimation of in-canopy flux distributions of reactive nitrogen and sulfur within a mixed hardwood forest in southern Appalachia. American Geophysical Union, New Orleans, LA, December 11 - 15, 2017.
Waldo, S., J. Beaulieu, AND Johnt Walker. Improving our process understanding of methane emissions from a mid-latitude reservoir by combining eddy covariance monitoring with spatial surveys. AGU Fall Meeting, New Orleans, LA, December 11 - 15, 2017.
Chen, X. AND Johnt Walker. Laboratory and field based evaluation of chromatography related performance of the Monitor for AeRosols and Gases in ambient Air (MARGA). 2017 AAAR, Raleigh, North Carolina, October 16 - 20, 2017.
Chen, X. AND Johnt Walker. Laboratory and field based evaluations of chromatography related performance of the Monitor for AeRosols and GAses in ambient Air (MARGA). AAAR 2017, Raleigh, NC, October 16 - 20, 2017.
Walker, Johnt, X. Chen, M. Xie, M. Hays, E. Edgerton, AND D. Schwede. Organic nitrogen in aerosols at a forest site in southern Appalachia. National Atmospheric Deposition Program Fall Meeting, San Diego, CA, October 30 - November 03, 2017.
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.
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).
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.
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.
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.