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The central goal of this proposal is to create and maintain a 10-yr (1998-2007, possibly more) TRMM-based global tropical cyclone related precipitation feature database with QuikSCAT sea surface wind and numerical model-based reanalysis parameters on a common framework and make it available to the hurricane science team for tropical cyclone studies. Using this database, impacts of hot towers and convective bursts and environmental factors on tropical cyclone rapid intensification will be examined. The University of Utah (UU) has developed a 'Precipitation Feature' (PF) database from more than 10 full years of TRMM observations including the precipitation radar, passive microwave, IR, and lightning data with NCEP reanalysis parameters added. This UU TRMM PF database provides us a very useful tool to analyze convective intensity by several TRMM-observed proxies and to investigate the influence of environmental forcing. Under the PI and Zipser's current PMM grants, we have done some preliminary work on generating level-2 of a TRMM-based tropical cyclone related PF (TCPF) database during a 9-yr period (1998-2006) including best track information, UU TRMM PF properties, and environmental parameters from the NCEP reanalysis. A total of 770 storms that reached tropical storm intensity level or above has been identified in all tropical cyclone basins around the globe. Six basins are considered: Atlantic (ATL), east-central Pacific (EPA), northwest Pacific (NWP), north Indian Ocean (NIO), south Indian Ocean (SIO), and South Pacific (SPA). In this proposed work, the first objective is to complete level-1, 2, and 3 of the TRMM-based TCPF database by expanding it from 9 years to up to near current and including TRMM 3B42 rainfall, TMI sea surface temperature (SST), QuikSCAT sea surface wind and environmental parameters from the NOGAPS analysis to be compared with NCEP reanalysis. We'll maintain a user-friendly online-access of images and level-2 &-3 data of this TCPF database. The second objective is to examine the roles of convective bursts/hot towers and environmental forcing on the rapid intensification of tropical cyclones. We'll group TCPFs into non-intensifying and intensifying including rapid and slow intensifying stages. Both the individual and combinations of effects will be addressed for different basins in a statistical base. The third objective is to select top-rank (i.e., most rapidly intensifying) cases from the database and perform a more detailed examination by employing all available satellite and aircraft data sources, such as total precipitable water observations from SSM/I, water vapor channels from MODIS, and possible NASA field program dataset to identify successes and deficiencies of the statistical treatment from TRMM-based studies. This proposed research fits into a special request of the announcement, which is "NASA also seeks proposals for building a database consisting of relevant NASA and NOAA satellite data on a common framework for the study of tropical cyclones and their environment." This research also addresses several questions in the announcement about tropical cyclone rapid intensification.

Project PI: Haiyan Jiang/University of Utah

Atmospheric Sciences University of Utah 135 S 1460 East Rm 819 (WBB) Salt Lake City, Ut 84112-0110

Phone: (801) 587-9089

Email: h.jiang@utah.edu

http://www.atmos.utah.edu/?module=facultyDetails&personId;=15782&orgId;=311

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Started: Aug 10, 2010

Last Activity: Dec 15, 2010

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