Collaborative Research: Extratropical Transition of Atlantic Tropical Cyclones: An Examination of the Factors Influencing Transition and Post-Transition Intensity Change

合作研究：大西洋热带气旋的温带转变：影响转变和转变后强度变化的因素研究

• 批准号: 9911212
• 负责人: Jenni Evans
• 金额: $ 16.09万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911212&HistoricalAwards=false
• 关键词: Collaborative; Research; Extratropical; Transition; Atlantic

This research is being done in collaboration with Dr. Christopher Velden of the University of Wisconsin. Extratropical transition of tropical cyclones is a poorly understood process, yet the resulting systems can have a tremendous impact on the weather in the northeastern U.S. and Canada, producing intense flooding rains, wind storms and wave damage. As a tropical storm transitions into an extratropical storm, its structure changes from a nearly axisymmetric cyclone with maximum winds near the surface to a highly asymmetric cyclone with strongest winds aloft. The transitions often involve interactions with surface fronts or upper level troughs or may result from mergers with pre-existing extratropical storms. The principal investigators will investigate the transition process by examining a number of observed cases of transitions to document the life cycle and structural changes and by conducting model simulations with a state-of-the-art mesoscale model. As part of this effort, they will test a variety of conceptual models of the transition process. A major new resource they will exploit is the availability of AMSU satellite data. These data will be used to derive thermal profiles and wind fields that will be incorporated into the model simulations. It is hoped that a better understanding of the transition process will improve forecasts.

这项研究是与威斯康星大学的 Christopher Velden 博士合作完成的。 热带气旋的温带转变过程人们知之甚少，但由此产生的系统可能对美国东北部和加拿大的天气产生巨大影响，产生强烈的洪水、风暴和波浪破坏。 当热带风暴转变为温带风暴时，其结构从地表附近风力最强的近轴对称气旋转变为高空风力最强的高度不对称气旋。 这种转变通常涉及与地表锋面或上层低压槽的相互作用，或者可能是与预先存在的温带风暴合并的结果。 主要研究人员将通过检查许多观察到的转变案例来研究转变过程，以记录生命周期和结构变化，并使用最先进的中尺度模型进行模型模拟。 作为这项工作的一部分，他们将测试过渡过程的各种概念模型。 他们将利用的一个主要新资源是 AMSU 卫星数据的可用性。 这些数据将用于导出热剖面和风场，并将其纳入模型模拟中。 希望更好地了解过渡过程将改善预测。