کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1722125 1014713 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Contribution of vortex Rossby wave to spiral rainband formation in tropical cyclones
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
پیش نمایش صفحه اول مقاله
Contribution of vortex Rossby wave to spiral rainband formation in tropical cyclones
چکیده انگلیسی

The contribution of the vortex Rossby wave (VRW) to the spiral rainband in the tropical cyclones (TCs) is studied in the framework of a barotropic non-divergent TC-like vortex model. The spectral function expanding method is used to analyze the disturbance evolution of a defined basic state vortex. The results show that the numerical solution of the model is a superposition of the continuous spectrum component (non-normal modes) and the discrete spectrum component (normal modes). Only the eyewall and the rainbands in the inner core-region in a TC are related to the VRW normal modes, whereas the continuous spectrum wave components play an important role in the formation of secondary-, principal-, and distant- rainbands, especially the outer rainband, through an indirect way. The continuous spectrum can promote the development of the TC circulation for the occurrence of a mesoscale instability. The convection under a favorable moisture condition will trigger the inertial-gravitational wave to cause the formation of unstable spiral bandliked-disturbances outside of the eyewall. The complicated interaction between the basic state-vortex and the VRW disturbances will cause a positive feedback between the TC circulation and the rainband.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrodynamics, Ser. B - Volume 26, Issue 5, October 2014, Pages 725-733