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Application of TRMM Multi-Satellite Precipitation Analysis and MODIS Aerosols to Hurricane Studies

Scott A. Braun NASA/GSFC braun@agnes.gsfc.nasa.gov

This poster has two foci. The first uses the TRMM Multi-Satellite Precipitation Analysis (TMPA) (also known as the TRMM 3B42 product), a 3-hourly near-global precipitation product with 0.25° resolution obtained by combining passive microwave retrievals of rainfall from several satellites (TRMM, AMSR-E, SSM/I, AMSU) and filling in remaining gaps with infrared estimates. The TRMM data are used as a calibrator for other sensors. Here, we use the TMPA rainfall data to compute the rainfall accumulation for hurricanes from 1998-2005 for the Atlantic and Eastern Pacific and 1998-2004 for the Western Pacific and North Indian Ocean for the months of June-November (the years included are based upon availability of best track data). In addition to rainfall accumulation, we compute Hovmoller diagrams that indicate the radius-time and azimuth-time variations of precipitation and their relationship to storm intensity over the life cycle of each storm. The second focus is on the relationship of Atlantic tropical cyclone activity to outbreaks of Saharan dust associated with the Saharan Air Layer. TMPA and other TRMM data are used in combination with MODIS-derived aerosol optical depth to examine the dust outbreak activity and its relationship to tropical cyclone (TC) activity for the years 2002-2006. Results suggest a sometimes complex relationship between dust outbreaks and TCs, with several TCs forming either immediately ahead of or behind a dust outbreak. Preliminary results also suggest no direct relationship between interannual variations of dust activity and TC activity, although indirect effects (such as cooling of SSTs) are not ruled out.

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