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复杂构型非孤立圆涡的能量频散
  • 期刊名称：科学通报，56（31）2599-2603, 2011 （SCIE）
  • 时间：0
  • 分类：O357.1[理学—流体力学;理学—力学]
  • 作者机构：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044, [2]无锡环境科学和技术研究中心,无锡214031
  • 相关基金：国家自然科学基金资助项目（40775038,40975036和40730948）
  • 相关项目：登陆台风强度变化机理研究
关键词： 涡旋, 热带气旋, 复杂构型, 能量频散, 波列
中文摘要：

能量频散是一个基础性的科学问题,与台风、暴雨、地震等灾害密切相关,一直受到多学科研究人员和广大预报员的关注.孤立圆涡能量频散的动力学己经清楚.但是,造成天气灾害的往往是非孤立圆涡.非孤立圆涡能量频散的动力学尚待探索.本文用线性化的正压无幅散涡度方程,研究了非孤立圆涡能量频散的特征.这里,非孤立圆涡指的是：一个热带气旋（TC）涡旋和一个中尺度涡构成的复杂构型.基于傅里叶变换的解析解和基于空间差分格式的数值解一致地显示：（1）在只有TC涡旋的条件下,涡旋能量频散形成一个TC-G-D的波列,3个波列成员中心的连线是一条与x轴平行的直线.这里,＂G＂和＂D＂分别代表高值和低值系统.（2）在非孤立圆涡的条件下,涡旋能量频散也形成了一个TC-G-D的波列,但是,3个波列成员中心的连线不再是一条与x轴平行的直线,而是一个三角形.（3）三角形底角的角度与初始中尺度涡的强度之间存在非线性联系.这些结果在台风预测中具有应用前景.

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