Simulations of 2008 JJA dust storms and their interactions with lower tropospheric ozone

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Thursday, 21 January 2010: 9:15 AM
B316 (GWCC)
Gregory S. Jenkins, Howard University, Washington, DC

During the summer of 2008, ozonesondes were launched from Dakar Senegal in Saharan Air Layer (SAL) and non-SAL environments. Ozone (O3) concentrations were depleted in the SAL layer for all cases. Here we make use of two regional models: RegCM3 and WRF-MOSAIC for simulating the SAL outbreaks and examining the vertical structure of the SAL. Further, we use WRF-MOSAIC to examine changes in ozone concentrations in the SAL layer for determining the causes for reduced O3. The results show that the dust outbreaks are closely tied to a westward moving thermal heat low at 925 hPa with strong Northerly winds leading to SAL outbreaks with increased optical depth. Simulations will be compared for three (3) SAL/dust outbreaks in June and one (1) SAL/dust outbreak in August of 2008.