HR: 0800h
AN: A21C-0881    [Abstracts]
TI: Role of Meteorology on Ozone Depletion in the Arctic Boundary Layer
AU: * Fuentes, J D
EM: jf6s@virginia.edu
AF: University of Virginia, Department of Environmental Sciences, 291 McCormick Road, Charlottesville, VA 22904 United States
AU: Bottenheim, J W
EM: Jan.Bottenheim@ec.gc.ca
AF: Environment Canada, Air Quality Branch 4905 Dufferin Street, Downsview, ON M3H 5T4 Canada
AU: Staebler, R
EM: Ralf.Staebler@ec.gc.ca
AF: Environment Canada, Air Quality Branch 4905 Dufferin Street, Downsview, ON M3H 5T4 Canada
AU: Hui, J
EM:
AF: Environment Canada, Air Quality Branch 4905 Dufferin Street, Downsview, ON M3H 5T4 Canada
AB: During the springtime ozone is routinely removed from the atmospheric layer extending from the surface to approximately 2 km above the ground. Although the atmospheric chemistry governing the ozone depletion events is reasonably well understood little knowledge exists to discern how dynamic and thermodynamic conditions of the lower atmosphere modulate the ozone removal process. To address this research gap, an acoustic sounder and sonic anemometers were deployed near Alert, Nunavut, Canada to obtain atmospheric turbulence and thermal characteristics of the atmospheric layer extending from the surface to 600 m above the ground. For the first time in the Arctic, for a year the deployed instruments provided continuous and high (e.g., 10 Hertz) resolution information to define the antecedent dynamic and thermodynamic conditions for ozone depletion events. In this presentation, high temporal and spatial resolution atmospheric turbulence characteristics are presented and discussed for conditions associated with onset and recovery of ozone depletion events. One key conclusion from this investigation is that strong atmospheric instability and high wind shear (> 1.0 m s-1 per m) exert control on the Arctic boundary layer to recover its steady state and normal ozone levels. Following ozone depletion events, the Arctic boundary layer ozone recovery is mediated through the effective vertical ozone transport from aloft. The unusual high levels of wind shear sustain the transport process.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 9315 Arctic region (0718, 4207)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005