Baroclinic Wave Lifecycle and Storm Track Dynamics

斜压波生命周期和风暴轨迹动力学

• 批准号: 9731393
• 负责人: Richard Lindzen
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9731393&HistoricalAwards=false
• 关键词: Baroclinic; Wave; Lifecycle; Storm; Track

9731393 Chang The weather and climate in the mid-latitudes are affected by the passage of cyclones and anticyclones. These systems are generally associated with waves in the upper troposphere which are organized into well defined regions known as storm tracks. Better understanding how the storm tracks form, how they evolve and what determines their location and intensity may help to advance the accuracy of medium range weather forecasting. Dr. Chang's recent results from data analyses and modeling studies suggest that mid-latitude baroclinic waves in these storm tracks are organized into wave packets which propagate eastward with group velocities much faster than the phase speeds of individual waves. The energy associated with these wave packets may contribute to the formation and development of upper level troughs and surface cyclones. Under this award, the principal investigator will extend his earlier results on the properties of wave packets and examine what role they might play in atmospheric predictability.

小行星9731393 中纬度地区的天气和气候受到气旋和反气旋的影响。 这些系统通常与对流层上层的波浪有关，这些波浪被组织成被称为风暴路径的明确定义的区域。 更好地了解风暴路径如何形成，如何演变以及是什么决定了它们的位置和强度，可能有助于提高中期天气预报的准确性。 Chang博士最近的数据分析和模拟研究结果表明，这些风暴路径中的中纬度斜压波被组织成波包，这些波包向东传播的群速度远远快于单个波的相速度。 与这些波包相关的能量可能有助于高空槽和地面气旋的形成和发展。 根据该奖项，首席研究员将扩展他早期关于波包性质的结果，并研究它们在大气可预测性中可能发挥的作用。