HR: 0800h
AN: A31B-0842    [Abstracts]
TI: Inter-Comparison of Ozone and Aerosol Observations During the NCAS Trans-Atlantic Saharan Dust Aerosol and Ocean Science Expedition
AU: * Hawkins-Strachan, M
EM: hawkins.michelle@gmail.com
AF: Howard University Program in Atmospheric Sciences, NOAA Center for Atmospheric Sciences HU Research Building 1 1840 7th St. NW, Room 305, Washington, DC 20001
AU: Morris, V R
EM: vmorris@howard.edu
AF: Howard University Program in Atmospheric Sciences, NOAA Center for Atmospheric Sciences HU Research Building 1 1840 7th St. NW, Room 305, Washington, DC 20001
AB: The NOAA Center for Atmospheric Sciences (NCAS) conducted a combined atmospheric and oceanographic experiment aboard the NOAA Ronald H. Brown ship to characterize the physico-chemical evolution of the Saharan Aerosol Layer during its long-range transport into the eastern seaboard of the United States and the Caribbean and to quantify its effects on the regional environment and climate. The NCAS Trans-Atlantic Aerosol and Oceanographic Science Expedition (AEROSE-04) departed on its 27-day voyage February 29, 2004 from Bridgetown, Barbados and concluded in San Juan, Puerto Rico on March 26, 2004. During AEROSE-04, several atmospheric constituents were measured to study the effects of Saharan dust on the chemistry of the atmospheric environment. Surface level measurements of ozone were obtained on an hourly basis along with aerosol number density during several dust storms that occurred during the cruise. Inter-comparisons between the ozone and aerosol number density datasets enable an evaluation of the behavior of ozone during dust storms. Ozone concentrations were generally observed to decrease during the dust storm. However this decrease in ozone was not always observed to be inversely proportional with daytime aerosol number density measurements. This indicates that an increase in aerosol optical depth above the marine boundary layer is not the sole mechanism involved in ozone depletion. We will present a detailed analysis of the ozone-aerosol relationships as a function of aerosol number density, aerosol surface area, and aerosol composition with the objective of evaluating the role of aerosol chemistry in the ozone depletion process.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0399 General or miscellaneous
DE: 9325 Atlantic Ocean
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005