Julia Lee-Taylor

Project Scientist
TIIMES - ACD
BEACHON

Contact Information:
PO Box 3000, Boulder, CO 80307-3000
Office: FL0 - 1132
Telephone: 303-497-1489
Email: julial@ucar.edu
Home Page

Project Summary:

Click on picture to view the entire figure.

Figure. Nitrogen fluxes from soil nitrification/denitrification. Sensitivity to soil saturation.

Julia Lee-Taylor is implementing a detailed empirically-based parameterization of soil nitrogen cycling in the CCSM.  The action of nitrifying and denitrifying bacteria results in release to the atmosphere of nitrogen gases N2, N2O and NOx.  The model includes factors such as  rainfall timing, soil moisture regime and temperature, which influence the rates of nitrification and denitrification and, ultimately, the quantities and proportions of the evolved gases.  The code is still in the troubleshooting stage.  They plan to use the working model to assess the effects of soil nitrogen cycling on tropospheric oxidation chemistry and on soil carbon cycling.

Community Service:

• Contributing Author - The Fourth Assessment Report, Chapter 7, Coupled Biogeochemical Cycles and Atmospheric Chemistry, IPCC Working Group 1

TIIMES External Collaborators:

Amnat Chidthaisong, The Joint Graduate School of Energy and the Environment
Phillippe Ciais, Institut Pierre Simon LaPlace
Peter Cox, Centre for Ecology and Hydrology
Pedro Leite Da Silva Dias, Universidade de São Paulo
Kenneth Denman, University of Victoria
Robert Dickinson, Georgia Institute of Technology
Didier Hauglustaine, Institut Pierre-Simon Laplace (IPSL)
Christoph Heinze, University of Bergen-Geophysical Institute
Daniel Jacob, Harvard University
Ulrike Lohmann, Institut f. Atmosphäre und Klima CHN
Srikanthan Ramachandran, Physical Research Laboratory
James Sulzman, Independent
Steven Wofsy, Harvard University
Xiayoe Zhang, Chinese Academy of Sciences-Institute of Earth Environment

Publications:

Camredon, M., B. Aumont, J. Lee-Taylor, S. Madronich, 2007: The SOA/VOC/Nox system: an explicit model of secondary organic aerosol formation. Atmos. Chem. Phys. Discuss., 7, 11223-11256.

Tie, X., S. Madronich, G. Li, Z. Ying, R. Zhang, A. R. Garcia, J. Lee-Taylor, Y. Liu, 2007: Characterizations of chemical oxidants in Mexico City: A regional chemical dynamical model (WRF-Chem) study. Atmos. Environ., 41, 1989-2008, doi: 10.1016/j.atmosenv.2006.10.053.

France, J. L., M. D. King, J. Lee-Taylor, 2007: Hydroxyl (OH) radical production rates in snowpacks from photolysis of hydrogen peroxide (H2O2) and nitrate (NO3). Atmos. Environ., 41, 5502-5509, doi: 10.1016/j.atmosenv.2007.03.056.

[J. Lee-Taylor is one of the Contributing Author not in the standard reference for the following IPPC Report]
Denman, K. L., G. P. Brasseur, A. Chidthaisong, P. Ciais, P. M. Cox, R. E. Dickinson, D. Hauglustaine, C. Heinze, E. Holland, D. Jacob, U. Lohmann, S. Ramachandran, P. L. Da Silva Dias, S. C. Wofsy, X. Zhang, 2007: Couplings between changes in the climate system and biogeochemistry. Chapter 7. Climate Change 2007: The Physical Science Basis, IPCC AR4 WG1 Final Report, Solomon, S., D. Qin, M/ Manning, Z. Chen, M. Marquis, K. B. Averyt, M. Tignor, and H. L. Miller, Eds., Cambridge University Press, 499-588.