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Records 1 to
25
of 51 records published between 07/16/2013 and 07/16/2018 from author John Walker, Jr.
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
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).
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.
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
Ran, L., Jon Pleim, C. Song, L. Band, J. Walker, AND F. Binkowski. A photosynthesis-based two-leaf canopy stomatal conductance model for meteorology and air quality modeling with WRF/CMAQ PX LSM. JOURNAL OF GEOPHYSICAL RESEARCH: ATMOSPHERES. American Geophysical Union, Washington, DC, 122(3):1930-1952, (2017). https://doi.org/10.1002/2016JD025583
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.
Aas, W., R. Artz, V. Bowersox, G. Carmichael, A. Cole, F. Dentener, H. Fagerli, D. Gay, J. Geddes, C. Hogrefe, F. O'Connor, J. Pienaar, A. Stein, AND Johnt Walker. Global Atmosphere Watch Workshop on Measurement-Model Fusion for Global Total Atmospheric Deposition (MMF-GTAD). World Meteorological Organization, Geneva, Switzerland, 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.
Schwede, D., G. Lear, Johnt Walker, AND M. Puchalski. Measurements and Modeling to Enhance Estimates of NH3 Total Deposition. Western Modeling Workshop, Boulder, Colorado, September 06 - 08, 2017.
Bash, J., Johnt Walker, E. Cooter, AND D. Schwede. Modeling and Measurements to Improve Bidirectional Exchange in CMAQ. 4th Biannual Western Modeling Workshop, Boulder, CO, September 06 - 09, 2017.
Bash, J., D. Schwede, E. Cooter, K. Foley, AND Johnt Walker. Modeling and Recent Shift in the Composition of Atmospheric Reactive Nitrogen. Webinar for CENRS Air Quality Research Subcommittee, RTP, NC, April 20, 2017.
Bash, J., Johnt Walker, E. Cooter, Q. Rasool, W. Robarge, AND N. Alnsour. Modeling the Air-Vegetation-Soil Exchange of Reactive Nitrogen. Managing Global Resources for a Secure Future 2017 Annual Meeting, Tampa, Florida, October 22 - 25, 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.
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.
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.
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.