Ninth Conference on Atmospheric Chemistry
19th Conference on Climate Variability and Change
AMS Forum: Climate Change Manifested by Changes in Weather

J7.9

Comparison of AEROSE I and AEROSE II Surface Level Ozone Measurements and Ozonesonde Profiles within Saharan Dust and Biomass Burning Plumes

Michelle D. Hawkins, Howard Univ., Washington, DC; and V. R. Morris, N. R. Nalli, and E. Joseph

Dust-ozone interactions are a rich area of investigation in atmospheric chemistry. For example, several recent studies have suggested that the presence of Saharan dust can have both positive and negative influences on atmospheric ozone concentrations. Characterization of ozone variability in the tropical marine environment can aid in validating and improving photochemical and chemical transport models, and provide insight into changes in the oxidizing and photochemical properties of the maritime atmosphere. The NOAA Center for Atmospheric Sciences at Howard University, in collaboration with NOAA/NESDIS, has conducted two shipboard experiments to examine the influence of Saharan dust on tropical Atlantic ozone concentrations and aerosol chemistry. AEROSE-I was a 27-day trans-Atlantic mission conducted in Spring 2004, whereas, AEROSE-II was 55-day mission that was conducted in Summer 2006. During both cruises, ozone and carbon monoxide were measured continuously along the cruise tracks. During AEROSE-II, twenty ozonesondes were launched along 23W in order to characterize the vertical structure of ozone during summertime dust episodes. Satellite imagery and data analysis show that the AEROSE team was able to characterize multiple dust intrusions during both the Spring and Summer seasons. Analyses of aerosol mass density, element composition, and black carbon data sets reveal at least four distinct air mass regimes: background marine boundary layer, African dust, biomass smoke, and mixed African dust and biomass burning. AEROSE-II encountered less intense dust plumes but significantly more intense biomass burning plumes than AEROSE-I. A comparison of ozone datasets from both cruises and an analysis of the ozonesonde results will be presented.

extended abstract  Extended Abstract (1.2M)

wrf recording  Recorded presentation

Joint Session 7, Measurements and Modeling of Aerosols (Joint with Ninth Conference on Atmospheric Chemistry, Forum on Climate Change as Manifested by Changes in Weather, and 19th Conference on Climate Variability and Change)
Monday, 15 January 2007, 10:45 AM-2:30 PM, 212A

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