HR: 0800h
AN: A51B-0041    [Abstracts]
TI: Biogenic Impact on O3 Levels Under Elevated CO2 Conditions
AU: * Mao, H
EM: hmao@typhoon.sr.unh.edu
AF: University of New Hampshire, Climate Change Research Center Morse Hall, 39 College Road, Durham, NH 03824
AU: Talbot, R
EM: robert.talbot@unh.edu
AF: University of New Hampshire, Climate Change Research Center Morse Hall, 39 College Road, Durham, NH 03824
AU: Sive, B
EM: bcs@gust.sr.unh.edu
AF: University of New Hampshire, Climate Change Research Center Morse Hall, 39 College Road, Durham, NH 03824
AU: Varner, R
EM: ruth.varner@unh.edu
AF: University of New Hampshire, Climate Change Research Center Morse Hall, 39 College Road, Durham, NH 03824
AU: Chen, M
EM: mchen@gust.sr.unh.edu
AF: University of New Hampshire, Climate Change Research Center Morse Hall, 39 College Road, Durham, NH 03824
AB: A three week field campaign was conducted at the Duke Forest, NC, Forest-Atmosphere Carbon Transfer and Storage-I Research Facility (FACTS-I) during the time period of September 10 - September 28, 2004. For the first time measurements of volatile organic compounds (VOCs), oxygenated VOCs (OVOCs), O₃, NO, CO₂, organic and inorganic aerosols were conducted above the forest canopy under two CO₂ environments: (1) present day (Ring 1, 370 ppmv) and (2) a future condition (Ring 2, 570 ppmv). Preliminary results show that levels of isoprene, light alkenes, and O3 were enhanced under elevated CO₂ conditions. In contrast, monoterpene levels were highest under present day CO₂. There was a tendency for higher peak/minimum O₃ mixing ratios in the Ring 2 environment. Beginning on September 16, O₃ mixing ratios exhibited a steady rise to near 40 ppbv on September 20 - 21. From September 21 - 27 the O₃ daily maximum value increased and peaked on September 24 near 70 ppbv. An identical trend was observed in Ring 2, with O₃ peaking around 80 ppbv. The CMAQ regional air quality model and the NCAR Master Mechanism box model are being used to determine the relative contributions to the elevated O₃ levels at Ring 2 from perturbations in various chemical species due to changes in biogenic emissions.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 3307 Boundary layer processes
DE: 3355 Regional modeling
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005