P57     Large-eddy simulation of idealized hurricanes at different sea surface temperatures.

Ren, Hehe, Key Lab of Smart Prevention and Mitigation for Civil Engineering Disasters of the Ministry of Industry and Information, and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, China, Jimy Dudhia, Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, and Hui Li, Key Lab of Smart Prevention and Mitigation for Civil Engineering Disasters of the Ministry of Industry and Information, and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, China

Idealized hurricanes show different characteristics at different sea surface temperatures in six nested domains down to 62 m grid size. Four cases were conducted, with sea surface temperatures of 26°, 27°, 28°, 29°C, respectively. Some interesting phenomena are obtained. First, for both the maximum of instantaneous wind velocity and time-averaged wind velocity, domain 6 (62m) converges to domain 5 (185m). Second, for sea surface temperature of 26°, domain 5 does not have small-scale turbulent structures, but the other three cases all have, this is also a new discovery relative to the previous work of R. Rotunno et al.. Another important phenomenon is that the distribution function of velocity changes between 27° and 28° case, and has different shapes between the 26°, 27° cases and the 28°, 29° cases, the latter ones having a second peak, which maybe means that the hurricane structure changes as sea surface temperature changes. Furthermore, the distribution of angular momentum, rainfall, surface inflow angle, and eyewall slope are shown.