HR: 1340h
AN: B13B-0220    [Abstracts]
TI: A Novel Approach to Eddy Covariance Fluxes of NO$_{2}$, $\Sigma$PNs, $\Sigma$ANs and HNO$_{3}$
AU: * Farmer, D K
EM: dfarmer@nature.berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Wooldridge, P J
EM: pjwool@socrates.berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Energy and Environment Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 United States
AB: The exchange of reactive nitrogen between the biosphere and atmosphere affects both oxidative atmospheric chemistry and ecosystem nutrient dynamics. Few direct measurements of reactive nitrogen oxide fluxes have been made due to the stringent instrumental requirements for eddy correlation analysis. Thermal dissociation-Laser Induced Fluorescence (TD-LIF) is a sensitive, selective, and fast (5Hz) technique for measuring NO$_{2}$, sum peroxy nitrates, sum alkyl nitrates, and nitric acid. We have deployed a TD-LIF instrument at the University of California - Blodgett Forest Research Station and used it to evaluate the potential for eddy covariance measurements of the fluxes of each of these 4 categories of NO$_{y}$. Here we present preliminary analysis of observed fluxes, and extensive diagnostics of instrument performance using spectral analysis.
DE: 0315 Biosphere/atmosphere interactions
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting