HR: 16:00h
AN: A44B-01    [Abstracts]
TI: Biosphere-atmosphere exchange of the reactive nitrogen oxides over a mid-elevation Sierra Nevada forest
AU: * Farmer, D K
EM: dfarmer@nature.berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, CA 94720 United States
AU: Wooldridge, P J
EM: pjwool@berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: rccohen@berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, CA 94720 United States
AU: Cohen, R C
EM: rccohen@berkeley.edu
AF: Department of Earth and Planetary Science, University of California, Berkeley, CA 94720 United States
AB: As nitrogen is frequently a limiting nutrient in forests, the exchange of reactive nitrogen oxides between the biosphere and atmosphere has ramifications on ecosystem nutrient dynamics. This exchange also has consequences on tropospheric chemistry by affecting trace gas budgets relevant to photochemistry and ozone formation. Thermal dissociation-laser induced fluorescence (TD-LIF) was used to measure eddy covariance fluxes of NO₂, total peroxy nitrates, total alkyl nitrates and HNO₃ at Blodgett Forest, a Ponderosa pine plantation in the mid-elevation Sierra Nevada's, during June-September 2003 and June 2004-June 2005. We will present the seasonal and diurnal cycles of these fluxes, and consider the net impact of this biosphere-atmosphere exchange on tropospheric chemistry and ecosystem dynamics.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0365 Troposphere: composition and chemistry
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0469 Nitrogen cycling
DE: 0470 Nutrients and nutrient cycling (4845, 4850)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005