GC21C-1109
A Genesis Potential Index for Tropical Cyclone by Using Oceanic Parameters
Tuesday, 15 December 2015
Poster Hall (Moscone South)
Lei Zhou, Second Insititute of Oceanogr., Hangzhou, China, Min Zhang, Hohai University, Nanjing, China, Dake Chen, Second Institute of Oceanography, State Oceanographic Administration of China, Hangzhou, China and Chunzai Wang, NOAA Miami, Miami, FL, United States
Abstract:
This study attempts to create a tropical cyclone (TC) genesis potential index (GPI) by considering oceanic parameters and necessary atmospheric parameters at the sea surface. Based on the general understanding of oceanic impacts on the TC genesis, many candidate factors are evaluated and discriminated, resulting in a new GPI index called GPIocean. GPIocean includes (1) the absolute vorticity at 1000 hPa, (2) the net sea surface longwave radiation, (3) the mean ocean temperature in the upper mixed layer, and (4) the depth of the 26°C isotherm. GPIocean is comparable to the existing GPIs in representing the TC genesis over the western North Pacific on climatological, interannual, and seasonal time scales. In the context of climate change, this new index is expected to be useful for evaluating the oceanic influences on the TC genesis, using ocean reanalysis products and/or climate model outputs.
