HR: 1330h
AN: A32A-0114    [PDF]
TI: Eddy Covariance Fluxes of Peroxyacetyl Nitrate (PAN) to a Coniferous Forest
AU: * Turnipseed, A A
EM: turnip@ucar.edu
AF: Atmospheric Chemistry Division National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305 United States
AU: Nemitz, E
EM: en@ceh.ac.uk
AF: Centre for Ecology and Hydrology, Bush Estate Penicuik, Midlothian, EH26 0QB United Kingdom
AU: Huey, G
EM: greg.huey@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences Georgia Institute of Technology, Georgia Institute of Technology, Atlanta, GA 30332 United States
AU: Guenther, A
EM: guenther@ucar.edu
AF: Atmospheric Chemistry Division National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305 United States
AU: Higgs, J
AF: School of Earth and Atmospheric Sciences Georgia Institute of Technology, Georgia Institute of Technology, Atlanta, GA 30332 United States
AU: Slusher, D
AF: School of Earth and Atmospheric Sciences Georgia Institute of Technology, Georgia Institute of Technology, Atlanta, GA 30332 United States
AU: Stickle, R
AF: School of Earth and Atmospheric Sciences Georgia Institute of Technology, Georgia Institute of Technology, Atlanta, GA 30332 United States
AU: Tanner, D
AF: School of Earth and Atmospheric Sciences Georgia Institute of Technology, Georgia Institute of Technology, Atlanta, GA 30332 United States
AB: As part of the CELTIC study, we have used a fast response chemical ionization mass spectrometer (CIMS) system to make rapid measurements (4 Hz) of peroxyacetyl nitrate (PAN). Concurrent fast wind velocities were then used to obtain direct eddy covariance fluxes of PAN. Fluxes were measured for eight consecutive days in July, 2003 at a loblolly pine forest in North Carolina. Covariances between PAN concentration and vertical wind velocity indicated consistent deposition fluxes that ranged up to approximately -12 ngN m$^{-2}$ s$^{-1}$. The average daytime flux was $\sim$ -2.5 ngN m$^{-2}$ s$^{-1}$ and the diurnal profile was consistent with uptake through plant stomates. Deposition velocities also showed a daytime maximum with an average daytime value of 7.1 mm s$^{-1}$. There was also some indication of nocturnal uptake when canopy elements were wet. These preliminary measurements suggest that uptake of PAN to forest canopies is significant and may play a role in both atmospheric chemical processes and nitrogen cycling within ecosystems.
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting