摘要
To investigate the impacts of solar radiation on tropical cyclone （TC） warm-core structure （i.e., 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 large-scale environment and thus promotes deep moist convec- tion, 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 upper-level inflow layer. This inflow carries the lower stratospheric air with high potential temperature and descends adiabatically in the eye, resulting in significant upper-level 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.
To investigate the impacts of solar radiation on tropical cyclone （TC） warm-core structure （i.e., 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 large-scale environment and thus promotes deep moist convec- tion, 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 upper-level inflow layer. This inflow carries the lower stratospheric air with high potential temperature and descends adiabatically in the eye, resulting in significant upper-level 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.
基金
sponsored by the National Key Basic Research Program of China (Grant No. 2015CB452803)
the National Natural Science Foundation of China (Grant No. 41275095)
the "Six peaks of high-level talent" funding project of Jiangsu
the Key University Science Research Project of Jiangsu Province (Grant No. 14KJA170005)
the China Meteorological Administration Henan Key Laboratory of Agrometeorological Support and Applied Technique (Grant No. AMF201403)
