HR: 0800h
AN: A51E-0134    [Abstracts]
TI: Continental Outflow from the Northeastern United States as Observed by Airborne Ozone Lidar
AU: * Banta, R M
EM: robert.banta@noaa.gov
AF: Environmental Technology Laboratory / NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: Senff, C J
EM: christoph.senff@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, 325 Broadway, Boulder, CO 80305 United States
AU: Darby, L S
EM: lisa.darby@noaa.gov
AF: Environmental Technology Laboratory / NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: White, A B
EM: allen.b.white@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, 325 Broadway, Boulder, CO 80305 United States
AU: Trainer, M
EM: michael.k.trainer@noaa.gov
AF: Aeronomy Laboratory / NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: Alvarez, R J
EM: raul.alvarez@noaa.gov
AF: Environmental Technology Laboratory / NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: Hardesty, R M
EM: michael.hardesty@noaa.gov
AF: Environmental Technology Laboratory / NOAA, 325 Broadway, Boulder, CO 80305 United States
AB: A continental outflow of pollutants, which represents an accumulation plume of pollutants from major cities and other sources from Washington DC to New York and Boston is often produced by summertime southwesterly synoptic flow along the East Coast of the United States, according to numerical weather prediction (NWP) modeling studies. Observational evidence of these effects is provided using measurements from NOAA's airborne ozone-profiling lidar, which measures a vertical curtain of height-resolved ozone concentrations from the surface to ~3 km above sea level (ASL) along the aircraft flight track. The daytime plume of a major source, the New York City urban-complex, was shown to be carried eastward over Long Island by late afternoon, while maintaining ozone concentrations exceeding 120 ppb. Flights several hundred kilometers offshore characterized the continental outflow, which consisted of a 75-ppb outflow with embedded plumes, which maintained concentrations of > 90 ppb and widths of ~100 km. Airborne ozone lidar data were combined with trajectory data from profiler networks, dropsonde data from the lidar aircraft (a DC-3), and air chemistry data from the NOAA P-3, to characterize the plume and the atmospheric transport. This combined analysis showed that the origins of the offshore plumes were the Philadelphia and Washington DC-Baltimore areas. Comparison of plume location and peak ozone concentrations with NWP model output will also be performed and presented.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005