HR: 14:10h
AN: A22D-03    [PDF]
TI: Evaluation of PROPHET and Ameri-Flux Measurements Obtained Over the Period 1998 to 2003 for Evidence of Ozone Effects on CO2 and Isoprene Fluxes
AU: * Carroll, M
EM: mcarroll@umich.edu
AF: Departments of Atmospheric, Oceanic, and Space Sciences and Chemistry, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 United States
AU: Hogg, A J
EM: alanhogg@umich.edu
AF: Departments of Atmospheric, Oceanic, and Space Sciences and Chemistry, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 United States
AU: Vogel, C S
EM: cvogel@umich.edu
AF: Departments of Atmospheric, Oceanic, and Space Sciences and Chemistry, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 United States
AU: Neil, L J
EM: ljneil@umich.edu
AF: Departments of Atmospheric, Oceanic, and Space Sciences and Chemistry, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 United States
AU: Pressley, S N
EM: spressle@wsunix.wsu.edu
AF: Department of Civil and Environmental Engineering, Washington State University, P.O. Box 642910, Pullman, WA 99164 United States
AU: Lamb, B
EM: blamb@wsu.edu
AF: Department of Civil and Environmental Engineering, Washington State University, P.O. Box 642910, Pullman, WA 99164 United States
AU: Westberg, H
EM: westberg@wsu.edu
AF: Department of Civil and Environmental Engineering, Washington State University, P.O. Box 642910, Pullman, WA 99164 United States
AU: Curtis, P S
EM: curtis.7@osu.edu
AF: Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 1735 Neil Lane, Columbus, OH 43210-1293 United States
AU: Thornberry, T D
EM: tthornbe@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ONT M5S3H6 Canada
AU: Soriano, Y
EM: leciel_leciel@hotmail.com
AF: Universidad Metropolitana, Calle A Este B-15, Trujillo Alto, PR 00976 United States
AU: Abrams, J
EM: jabrams@knox.edu
AF: Department of Physics, Knox College, 2 E. South Street, Galesburg, IL 61401-4999 United States
AU: Fortner, E
EM: edfortner@tamu.edu
AF: Department of Atmospheric Sciences, Texas A & M University, 3150 TAMU, College Station, TX 77843-3150 United States
AU: Yageman, L
EM: lyageman@umich.edu
AF: Departments of Atmospheric, Oceanic, and Space Sciences and Chemistry, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 United States
AU: Moody, J
AF: Department of Environmental Sciences, University of Virginia, Clark Hall, Room 351B, Charlottesville, VA 22904-4123 United States
AU: Lilly, M A
EM: ml3x@virginia.edu
AF: Department of Environmental Sciences, University of Virginia, Clark Hall, Room 351B, Charlottesville, VA 22904-4123 United States
AU: Cooper, O R
EM: cooper@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, 216 UCB, Boulder, CO 80309-0216 United States
AB: Significant increases in surface ozone have been observed in recent decades, particularly in both urban and rural areas in the Northern Hemisphere. Although considerable work has been done to elucidate the effects of ozone on plant physiology, there have been relatively few modeling studies assessing ozone effects on ecosystems and only one large-scale fumigation study involving elevated levels of both CO2 and O3 is underway. Very little is known about the subsequent effects of ozone exposure and deposition on biogenic emissions. With increasing emissions of reactive nitrogen oxides and thus increasing levels of surface ozone expected for the foreseeable future, the effects of ozone on ecosystem function must be more thoroughly studied so that we may quantitatively assess impacts on carbon cycling and storage. Measurements of ambient ozone, meteorological parameters, and isoprene fluxes (1997 - 2003), CO2 and H2O fluxes (1998 - 2003), and O3 fluxes (2002 and 2003) were obtained at the Program for Research on Oxidants: PHotochemistry, Emissions, and Transport (PROPHET) and AmeriFlux Towers at the University of Michigan Biological Station. We examine these data for evidence for possible effects of ozone. In particular, it appears that ambient O3 levels may influence the observed relationship between isoprene emissions and sensible heat flux, where there is a high degree of correlation but the slopes vary day-to-day. As well, we attempt to sort out the influences of ozone and soil moisture on CO2 fluxes. We also assess the relative levels of ozone foliar uptake and deposition by evaluating the behavior of ozone fluxes during periods when it is likely that stomata close mid-day. An assessment of year-to-year variability for these 7 growing seasons is also provided.
DE: 0315 Biosphere/atmosphere interactions
DE: 0365 Troposphere--composition and chemistry
DE: 0400 Biogeosciences
DE: 1600 GLOBAL CHANGE (New category)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting