On the Optimal Initial Inner-Core Size for Tropical Cyclone Intensification: An Idealized Numerical Study  

作　　者：Rong FEI Yuqing WANG 

机构地区：[1]School of Atmospheric Sciences and Remote Sensing,Wuxi University,Wuxi 214105,China [2]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China [3]International Pacific Research Center,Department of Atmospheric Sciences,School of Ocean and Earth Science and Technology,University of Hawaii at Manoa,Honolulu,Hawaii 96822,USA

出　　处：《Advances in Atmospheric Sciences》2024年第11期2141-2155,共15页大气科学进展（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.41730960);Wuxi University Research Start-up Fund for Introduced Talents (2024r037);Yuqing WANG was supported by the NSF (Grant No. AGS-1834300)。

摘　　要：Recent observational and numerical studies have revealed the dependence of the intensification rate on the inner-core size of tropical cyclones(TCs). In this study, with the initial inner-core size(i.e., the radius of maximum wind—RMW)varied from 20–180 km in idealized simulations using two different numerical models, we found a nonmonotonic dependence of the lifetime maximum intensification rate(LMIR) on the inner-core size. Namely, there is an optimal innercore size for the LMIR of a TC. Tangential wind budget analysis shows that, compared to large TCs, small TCs have large inward flux of absolute vorticity due to large absolute vorticity inside the RMW. However, small TCs also suffer from strong lateral diffusion across the eyewall, which partly offsets the positive contribution from large inward flux of absolute vorticity. These two competing processes ultimately lead to the TC with an intermediate initial inner-core size having the largest LMIR. Results from sensitivity experiments show that the optimal size varies in the range of 40–120 km and increases with higher sea surface temperature, lower latitude, larger horizontal mixing length, and weaker initial TC intensity. The 40–120 km RMW corresponds to the inner-core size most commonly found for intensifying TCs in observations, suggesting the natural selection of initial TC size for intensification. This study highlights the importance of accurate representation of TC inner-core size to TC intensity forecasts by numerical weather prediction models.

关 键 词：tropical cyclones INTENSIFICATION inner-core size idealized simulations 

分 类 号：P444[天文地球—大气科学及气象学] P412