Authors: Xuyang Ge Yue Ma Shunwu Zhou Tim Li
Publish Date: 2015/06/10
Volume: 32, Issue: 8, Pages: 1038-1048
Abstract
To investigate the impacts of solar radiation on tropical cyclone TC warmcore structure ie the magnitude and height a pair of idealized simulations are conducted by specifying different strengths of solar shortwave radiation It is found that the TC warm core is highly sensitive to the shortwave radiative effect For the nighttime storm a tendency for a more intense warm core is found with an elevated height compared to its daytime counterpart As pointed out by previous studies the radiative cooling during nighttime destabilizes the local and largescale environment and thus promotes deep moist convection which enhances the TC’s intensity Due to the different inertial stabilities the diabatic heating in the eyewall will force different secondary circulations For a strong TC with a deeper vertical structure this promotes a thin upperlevel inflow layer This inflow carries the lower stratospheric air with high potential temperature and descends adiabatically in the eye resulting in significant upperlevel warming The Sawyer–Eliassen diagnosis further confirms that the height of the maximum temperature anomaly is likely attributable to the balance among the forced secondary circulations
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