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| DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON | |
| 作者姓名： | 冉令坤 阿布都尔·里赫姆 阿尔·拉马纳丹 |
| 作者单位： | RAN Ling-kun(Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China);Abdul REHIM(Bangladesh Meteorological Department,Dhaka,Bangladesh);AL RAMANATHAN(School of Environmental Science,Jawaharlal Nehru University,New Delhi,India) |
| 基金项目： | 国家重点基础研究发展规划(973计划)，National Natural Sciences Foundations of China |
| 摘 要： | A generalized wave-activity density, which is defined as an absolute value of production of
three-dimensional vorticity vector perturbation and gradient of general potential temperature perturbation,
is introduced and its wave-activity law is derived in Cartesian coordinates. Constructed in an agoestrophic
and nonhydrostatic dynamical framework, the generalized wave-activity law may be applicable to diagnose
mesoscale weather systems leading to heavy rainfall. The generalized wave-activity density and
wave-activity flux divergence were calculated with the objective analysis data to investigate the character
of wave activity over heavy-rainfall regions. The primary dynamical processes responsible for disturbance
associated with heavy rainfall were also analyzed. It was shown that the generalized wave-activity density
was closely correlated to the observed 6-h accumulative rainfall. This indicated that the wave activity or
disturbance was evident over the frontal and landfall-typhoon heavy-rainfall regions in middle and lower
troposphere. For the landfall-typhoon rainband, the portion of generalized wave-activity flux divergence,
denoting the interaction between the basic-state cyclonic circulation of landfall typhoon and mesoscale
waves, was the primary dynamic process responsible for the evolution of generalized wave-activity density. |
| 关 键 词： | 台风雨 活性 诊断 中尺度天气系统 温度扰动 动力学过程 气旋性环流 调查数据 |
DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON |
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| RAN Ling-kun,Abdul REHIM and AL RAMANATHAN.DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON[J].Journal of Tropical Meteorology,2009,15(2):121-129. | |
| Authors: | RAN Ling-kun Abdul REHIM and AL RAMANATHAN |
| Institution: | 1. Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China 2. Bangladesh Meteorological Department,Dhaka,Bangladesh 3. School of Environmental Science,Jawaharlal Nehru University,New Delhi,India |
| Abstract: | A generalized wave-activity density, which is defined as an absolute value of production of three-dimensional vorticity vector perturbation and gradient of general potential temperature perturbation, is introduced and its wave-activity law is derived in Cartesian coordinates. Constructed in an agoestrophic and nonhydrostatic dynamical framework, the generalized wave-activity law may be applicable to diagnose mesoscale weather systems leading to heavy rainfall. The generalized wave-activity density and wave-activity flux divergence were calculated with the objective analysis data to investigate the character of wave activity over heavy-rainfall regions. The primary dynamical processes responsible for disturbance associated with heavy rainfall were also analyzed. It was shown that the generalized wave-activity density was closely correlated to the observed 6-h accumulative rainfall. This indicated that the wave activity or disturbance was evident over the frontal and landfall-typhoon heavy-rainfall regions in middle and lower troposphere. For the landfall-typhoon rainband, the portion of generalized wave-activity flux divergence, denoting the interaction between the basic-state cyclonic circulation of landfall typhoon and mesoscale waves, was the primary dynamic process responsible for the evolution of generalized wave-activity density. |
| Keywords: | dynamic meteorology wave-activity density wave-activity flux divergence landfall typhoon heavy-rainfall event |
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