北极东北航道起始段海域位于我国黄渤海,大风和强降水是可能威胁到该海域航运安全的主要灾害性天气类型。其中寒潮天气过程伴随的冷空气大风以及热带气旋、温带气旋等天气系统产生的大风、强降水等灾害性天气,对该海域航运安全造成很大...北极东北航道起始段海域位于我国黄渤海,大风和强降水是可能威胁到该海域航运安全的主要灾害性天气类型。其中寒潮天气过程伴随的冷空气大风以及热带气旋、温带气旋等天气系统产生的大风、强降水等灾害性天气,对该海域航运安全造成很大影响。利用1991—2020年美国国家环境预报中心(National Centers for Environmental Prediction,NCEP)全球逐日再分析资料,分析了北极东北航道适航期(7—10月)Rossby波沿高空急流能量传播特征及其对北极东北航道起始段海域天气的影响,特别是对强降水的影响。结果表明:(1)沿北半球副热带地区250hPa高空西风急流轴经向风表现为纬向三波型准静止的Rossby波形态;(2)高空250hPa大气准静止Rossby波波源位于地中海地区,波动在此激发并沿急流向东传播,传播过程中波动能量耗散,但波源即地中海地区能量的不断注入,使其得以维持和加强;(3)波作用通量散度指数与北极东北航道起始段海域降水量、风速相关系数绝对值达0.5以上,其中位于我国东北部至鄂霍茨克海地区的波作用通量指数与降水量和风速相关系数的绝对值均接近0.9,属于强相关,说明Rossby波沿高空急流传播时能量汇集、加强,对北极东北航道起始段海域的降水量、风速影响较大,从而可触发强降水、大风等灾害性天气;(4)当Rossby波扰动偏强时,向下游传播能量偏强,则西风急流加强,垂直上升运动增强,导致北极东北航道起始段海域降水异常偏多。展开更多
Based on an algebraically Rossby solitary waves evolution model,namely an extended(2+1)-dimensional Boussinesq equation,we firstly introduced a special transformation and utilized the Hirota method,which enable us to ...Based on an algebraically Rossby solitary waves evolution model,namely an extended(2+1)-dimensional Boussinesq equation,we firstly introduced a special transformation and utilized the Hirota method,which enable us to obtain multi-complexiton solutions and explore the interaction among the solutions.These wave functions are then employed to infer the influence of background flow on the propagation of Rossby waves,as well as the characteristics of propagation in multi-wave running processes.Additionally,we generated stereogram drawings and projection figures to visually represent these solutions.The dynamical behavior of these solutions is thoroughly examined through analytical and graphical analyses.Furthermore,we investigated the influence of the generalized beta effect and the Coriolis parameter on the evolution of Rossby waves.展开更多
文摘北极东北航道起始段海域位于我国黄渤海,大风和强降水是可能威胁到该海域航运安全的主要灾害性天气类型。其中寒潮天气过程伴随的冷空气大风以及热带气旋、温带气旋等天气系统产生的大风、强降水等灾害性天气,对该海域航运安全造成很大影响。利用1991—2020年美国国家环境预报中心(National Centers for Environmental Prediction,NCEP)全球逐日再分析资料,分析了北极东北航道适航期(7—10月)Rossby波沿高空急流能量传播特征及其对北极东北航道起始段海域天气的影响,特别是对强降水的影响。结果表明:(1)沿北半球副热带地区250hPa高空西风急流轴经向风表现为纬向三波型准静止的Rossby波形态;(2)高空250hPa大气准静止Rossby波波源位于地中海地区,波动在此激发并沿急流向东传播,传播过程中波动能量耗散,但波源即地中海地区能量的不断注入,使其得以维持和加强;(3)波作用通量散度指数与北极东北航道起始段海域降水量、风速相关系数绝对值达0.5以上,其中位于我国东北部至鄂霍茨克海地区的波作用通量指数与降水量和风速相关系数的绝对值均接近0.9,属于强相关,说明Rossby波沿高空急流传播时能量汇集、加强,对北极东北航道起始段海域的降水量、风速影响较大,从而可触发强降水、大风等灾害性天气;(4)当Rossby波扰动偏强时,向下游传播能量偏强,则西风急流加强,垂直上升运动增强,导致北极东北航道起始段海域降水异常偏多。
基金Supported by the National Natural Science Foundation of China(No.32360249)the Natural Science Foundation of Inner Mongolia Autonomous Region of China(No.2022QN01003)+2 种基金the University Scientific Research Project of Inner Mongolia Autonomous Region of China(No.NJZY22484)the Scientific Research Improvement Project of Youth Teachers of Inner Mongolia Autonomous Region of China(No.BR230161)the Inner Mongolia Agricultural University Basic Discipline Scientific Research Launch Fund(No.JC2020003)。
文摘Based on an algebraically Rossby solitary waves evolution model,namely an extended(2+1)-dimensional Boussinesq equation,we firstly introduced a special transformation and utilized the Hirota method,which enable us to obtain multi-complexiton solutions and explore the interaction among the solutions.These wave functions are then employed to infer the influence of background flow on the propagation of Rossby waves,as well as the characteristics of propagation in multi-wave running processes.Additionally,we generated stereogram drawings and projection figures to visually represent these solutions.The dynamical behavior of these solutions is thoroughly examined through analytical and graphical analyses.Furthermore,we investigated the influence of the generalized beta effect and the Coriolis parameter on the evolution of Rossby waves.
