Symmetric and Asymmetric Intensification Processes in Tropical Cyclones
热带气旋的对称和非对称强化过程
基本信息
- 批准号:0432551
- 负责人:
- 金额:$ 18.54万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2005
- 资助国家:美国
- 起止时间:2005-01-01 至 2008-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Tropical cyclone development and intensification is driven in large part by the release of latent heat of condensation in cumulonimbus convection organized around the center of the storm. For developing storms, these areas of convection are highly asymmetric and often displaced from the storm center. In previous work, the Principal Investigator has shown how the heat energy released in asymmetric convection is converted into kinetic energy of the axisymmetric wind field through a sequence of asymmetric and then symmetric adjustment processes. From previous work using balance models of axisymmetric dynamics, it is already known that the efficiency of this process (the amount of vortex intensification per unit heating) is quite small, on the order of 5%, and depends strongly on both the location of the convection and the structure of the cyclone itself. The new model used for this work resolves the unbalanced, fully nonhydrostatic dynamics of both asymmetric and symmetric motions. This project will further analyze the symmetric and asymmetric processes, which mediate these energy transfers, and in particular will document the efficiency of the intensification process for particular heating distributions and storm structures. The interaction of outward propagating gravity waves with the symmetric wind field also will be examined, along with a new possible mechanism connecting gravity waves to spiral band formation.This work potentially will lead to better understanding and forecasting of tropical cyclone development and rapid intensification phenomena. The computer programs used to simulate the symmetric and asymmetric adjustment processes will be made available to the community for general use. This project may also lay the foundation for a new approach to hurricane intensity forecasting, which would combine satellite observations of precipitation and convective heating with a simple dynamical model to predict short-term intensity change.
热带气旋的发展和增强很大程度上是由围绕风暴中心组织的积雨云对流中凝结潜热的释放驱动的。 对于发展中的风暴,这些对流区域是高度不对称的,并且经常偏离风暴中心。 在以前的工作中,主要研究者已经展示了如何在不对称对流中释放的热能通过一系列不对称然后对称的调整过程转化为轴对称风场的动能。 从以前的工作使用平衡模型的轴对称动力学,它是已知的,这一过程的效率(单位加热的涡流强化量)是相当小的,在5%的顺序,强烈地依赖于对流的位置和结构的气旋本身。 用于这项工作的新模型解决了不对称和对称运动的不平衡,完全非流体静力学动力学。 该项目将进一步分析对称和非对称过程,介导这些能量转移,特别是将记录特定的加热分布和风暴结构的强化过程的效率。 我们亦会研究向外传播的重力波与对称风场的相互作用,沿着探讨重力波与螺旋带形成的可能机制,这项工作将有助我们更好地了解和预测热带气旋的发展和快速增强现象。 用以模拟对称和非对称调整过程的计算机程序将提供给社会各界普遍使用。 该项目还可能为飓风强度预测的新方法奠定基础,这种方法将把联合收割机对降水和对流加热的卫星观测与预测短期强度变化的简单动力学模型结合起来。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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David Nolan其他文献
"Sit Up Straight": Time to Re-evaluate.
“坐直”:重新评估的时候了。
- DOI:
10.2519/jospt.2019.0610 - 发表时间:
2019 - 期刊:
- 影响因子:0
- 作者:
D. Slater;V. Korakakis;P. O'Sullivan;David Nolan;K. O’Sullivan - 通讯作者:
K. O’Sullivan
Understanding the deformation gradient in Abaqus and key guidelines for anisotropic hyperelastic user material subroutines (UMATs).
了解 Abaqus 中的变形梯度和各向异性超弹性用户材料子程序 (UMAT) 的关键指南。
- DOI:
- 发表时间:
2019 - 期刊:
- 影响因子:3.9
- 作者:
David Nolan;C. Lally;Patrick McGarry - 通讯作者:
Patrick McGarry
DECISIVE MOMENTS AND DECISIVE CHANGE: VETERAN PHOTOJOURNALIST PERSPECTIVES ON CHANGES IN LEARNING AND PRACTICE
决定性时刻和决定性变化:资深摄影记者对学习和实践变化的看法
- DOI:
- 发表时间:
2012 - 期刊:
- 影响因子:0
- 作者:
David Nolan - 通讯作者:
David Nolan
<strong>73.</strong> : A unique case of central nervous system immune reconstitution inflammatory syndrome: Examination of antigen specific T cell immunity
- DOI:
10.1016/j.jocn.2014.06.087 - 发表时间:
2014-11-01 - 期刊:
- 影响因子:
- 作者:
Kevin D.J. O’Connor;Niamh M. Keane;David Nolan;Wai Leong;Mina John - 通讯作者:
Mina John
Detection and characterization of viruses of the genus Megalocytivirus in ornamental fish imported into an Australian border quarantine premises: an emerging risk to national biosecurity.
进口到澳大利亚边境检疫场所的观赏鱼中巨细胞病毒属病毒的检测和特征分析:国家生物安全面临的新风险。
- DOI:
10.1111/jfd.12222 - 发表时间:
2015 - 期刊:
- 影响因子:2.5
- 作者:
David Nolan;F. Stephens;M. Crockford;J. B. Jones;Michael Snow - 通讯作者:
Michael Snow
David Nolan的其他文献
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{{ truncateString('David Nolan', 18)}}的其他基金
Tropical Cyclones from 400 to 40 hPa
400 至 40 hPa 的热带气旋
- 批准号:
2334173 - 财政年份:2024
- 资助金额:
$ 18.54万 - 项目类别:
Standard Grant
Collaborative Research: Convective Gravity Waves in the Stratosphere (CGWaveS)
合作研究:平流层对流重力波(CGWaveS)
- 批准号:
2017319 - 财政年份:2021
- 资助金额:
$ 18.54万 - 项目类别:
Continuing Grant
PREEVENTS Track 2: Collaborative Research: More resilient coastal cities and better hurricane forecasts through multi-scale modeling of extreme winds in the urban canopy
预防事件轨道 2:协作研究:通过对城市冠层极端风的多尺度建模,增强沿海城市的复原力和更好的飓风预报
- 批准号:
1663947 - 财政年份:2017
- 资助金额:
$ 18.54万 - 项目类别:
Continuing Grant
The Spectrum of Gravity Waves Radiating from Tropical Cyclones with Observations, Simulations, and Theoretical Modeling
通过观测、模拟和理论建模研究热带气旋辐射的重力波频谱
- 批准号:
1654831 - 财政年份:2017
- 资助金额:
$ 18.54万 - 项目类别:
Continuing Grant
Advancing Understanding of the Tornado Vortex through Numerical Simulations of Increasing Complexity and Evaluation of Observing Systems
通过增加复杂性的数值模拟和观测系统的评估来增进对龙卷风涡旋的理解
- 批准号:
1265899 - 财政年份:2013
- 资助金额:
$ 18.54万 - 项目类别:
Standard Grant
Collaborative Research: Tropical Waves and Intertropical Convergence Zones in Simulations with Explicit Convection
协作研究:显式对流模拟中的热带波和热带辐合带
- 批准号:
1146701 - 财政年份:2012
- 资助金额:
$ 18.54万 - 项目类别:
Standard Grant
Collaborative Research: Understanding Tropical Cyclone Evolution in Wind Shear through a Synthesis of Observational Data Sets and Idealized Simulations
合作研究:通过综合观测数据集和理想化模拟了解风切变中的热带气旋演化
- 批准号:
1132646 - 财政年份:2011
- 资助金额:
$ 18.54万 - 项目类别:
Standard Grant
Collaborative Research: Environmental Control of Tropical Cyclone Activity
合作研究:热带气旋活动的环境控制
- 批准号:
0851021 - 财政年份:2009
- 资助金额:
$ 18.54万 - 项目类别:
Standard Grant
The Horizontal and Vertical Structure of Tropical Cyclones: Theory, Observations, and Idealized Modeling
热带气旋的水平和垂直结构:理论、观测和理想化建模
- 批准号:
0756308 - 财政年份:2008
- 资助金额:
$ 18.54万 - 项目类别:
Continuing Grant
Collaborative Research: Global Aspects of Tropical Cyclogenesis
合作研究:热带气旋发生的全球方面
- 批准号:
0630721 - 财政年份:2006
- 资助金额:
$ 18.54万 - 项目类别:
Standard Grant
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