Numerical Simulation of Typhoon Gladys (1994) and Its Interaction with Taiwan Terrain Using the GFDL Hurricane Model-猫眼课题宝

DOI：

发表时间：

期刊：

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Chun;WU Chieh

利用地球物理流体动力实验室（GFDL）的飓风模式进行数值积分，以研究1994年台风格拉迪斯（Gladys）的演变及其与台湾地形的相互作用。与以往的研究结果一致，台湾的地形导致格拉迪斯的平移速度减慢和南偏，因为它接近台湾。另一方面，格拉迪斯在经过台湾时加速向西北移动，这可能与潮湿过程有关，与Lin等人的干燥模式中的路径模式不同。虽然GFDL飓风模式预测低估了格拉迪斯的强度，但该模式可以捕捉到格拉迪斯强度的演变，特别是登陆期间的减弱，这主要是由于格拉迪斯接近台湾地形时，边界层的水汽供应被切断。其他中尺度现象，包括强降水的模式和二次低压的形成，很好地模拟了模式，虽然它们的位置与观测结果有些不同。详细的分析表明，中央山脉以东的地面低压中心是由格拉迪斯环流引起的下坡绝热增温（焚风）引起的。在CMR以西的准定常副低压主要是由CMR上空的环境东风气流引起的，而与格拉迪斯环流相关的下坡绝热变暖则在格拉迪斯靠近台湾时起着增强作用。位涡收支分析表明，凝结加热在风暴周围位涡演变中起主要作用，而当格拉迪斯位于台湾地形上空时，位涡的地面摩擦耗散作用更加显著。最后，对台风初始涡的实验表明，台风初始涡的不同特征可以导致不同的路径型，从而导致完全不同的台风-地形相互作用，这表明台风初始化对风暴的重要性

Numerical integrations using the Geophysical Fluid Dynamics Laboratory (GFDL) hurricane model were performed to study the evolution of Typhoon Gladys (1994) and its interaction with the Taiwan terrain. Consistent with most previous studies, the Taiwan topography results in the deceleration of Gladys’s translation speed and southward deviation as it approaches Taiwan. On the other hand, Gladys accelerates northwestward while passing Taiwan, which is likely to be related to the moist processes, and differs from the track pattern in the dry model of Lin et al. Although the GFDL hurricane model forecast underestimates Gladys’s intensity, the model can capture the evolution of Gladys’s intensity, especially its weakening during landfall, which is primarily due to the cutoff of the water vapor supply in the boundary layer as Gladys approached the Taiwan terrain. Other mesoscale phenomena, including the pattern of heavy precipitation and the formation of secondary lows, are well simulated by the model, though their locations are somewhat different from those observed. Detailedanalyses indicate that the surface low pressure center to the east of the Central Mountain Range (CMR) is induced by the downslope adiabatic warming (foehn) associated with the circulation of Gladys. The quasi-stationary secondary low to the west of the CMR is mainly induced by the environmental easterly ﬂow over the CMR, while the downslope adiabatic warming associated with the circulation of Gladys acts to enhance it as Gladys is close to Taiwan. The potential vorticity budget analysis indicates that the condensational heating plays a major role in the potential vorticity evolution around the storm, while the surface frictional dissipation of the potential vorticity becomes more signiﬁcant as Gladys is over the Taiwan terrain. Finally, the experiment with a larger and stronger initial typhoon vortex indicates that different initial speciﬁcation of a typhoon vortex can result in a different track pattern and thus leads to a totally different typhoon–topography interaction, suggesting the importance of typhoon initialization for storm

Numerical Simulation of Typhoon Gladys (1994) and Its Interaction with Taiwan Terrain Using the GFDL Hurricane Model

文献摘要

被引文献

相似文献