HR: 1340h
AN: A53C-1341    [Abstracts]
TI: Lidar Aerosol Profiles Measured From Halifax During Summer 2007
AU: * Crawford, L
EM: lucyc@fizz.phys.dal.ca
AF: Department of Physics and Atmospheric Science Dalhousie University, Dalhousie University Dunn Building, Room 218, Halifax, NS B3H3J5, Canada
AU: Duck, T J
EM: tom.duck@dal.ca
AF: Department of Physics and Atmospheric Science Dalhousie University, Dalhousie University Dunn Building, Room 218, Halifax, NS B3H3J5, Canada
AU: Doyle, J
EM: doylejg@dal.ca
AF: Department of Physics and Atmospheric Science Dalhousie University, Dalhousie University Dunn Building, Room 218, Halifax, NS B3H3J5, Canada
AU: Harris, R
EM: rob.harris@dal.ca
AF: Department of Physics and Atmospheric Science Dalhousie University, Dalhousie University Dunn Building, Room 218, Halifax, NS B3H3J5, Canada
AU: Beauchamp, S
EM: steve.beauchamp@ec.gc.ca
AF: Environment Canada, Atlantic Air Quality Sciences, Queen Square - 16th Floor 45 Alderney Drive, Dartmouth, NS B2Y2N6, Canada
AB: Measurements of aerosol profiles in the troposphere and lower stratosphere were obtained with a high-power Raman Lidar from Halifax, Nova Scotia (44.63N, 63.58W) on the East Coast of Canada during Summer 2007. Observations throughout the troposphere at high temporal resolution were made possible by using a new dual-receiver setup. The lidar was operated in clear-sky conditions, and several long duration (> 80 hours) data sets were obtained. The measurements reveal the presence of boundary-layer aerosols during episodes of pollution transport from the Eastern US and Canada, and are compared with surface measurements of ozone and other species. Boundary layer development, entrainment and mixing are evident in the data. Structured plumes at higher altitudes are traced back to biomass burning events throughout North America. Aerosols were also observed on two occasions at 15 km in altitude, and are most likely due to pyroconvection. The measurements are being used to help understand transport and mixing processes, and to form a climatology of aerosol export from North America during the summer months.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting