Dynamics of Rotation and Scale Selection in Deep Convective Storms

深对流风暴中的旋转动力学和尺度选择

基本信息

  • 批准号:
    9981130
  • 负责人:
  • 金额:
    $ 47.29万
  • 依托单位:
  • 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:
    2000-08-01 至 2004-07-31
  • 项目状态:
    已结题

项目摘要

This research is focussed on study of deep convective storm dynamics with emphasis on three related yet scientifically distinct problems. The first concerns the tendency for some severe (supercell) storms to develop a succession of mesocyclones at fairly regular intervals. This "cyclic mesocyclogenesis" has been observed in real storms and noted in some numerical simulations. It is proposed to identify the conditions (both environmental and storm-induced) that delineate cyclic from non-cyclic storms. In addition, the Principal Investigators will extend their previous work down to the tornado scale to study cyclic tornadogenesis with emphasis on multi-scale linkages between the tornado vortex circulation and that of the parent mesocyclone. The second study seeks to understand the dynamics of storms and storm systems which, during all or part of their lifetime, move though environments comprising large horizontal and/or temporal variations in shear and/or stability. Although environmental variability is known to play a key role in storm lifecycles, previous cloud model simulations have utilized a horizontally uniform base state environment. The Principal Investigators will extend prior research by further investigating the dynamics associated with storm environmental transitions and, by combining variations in instability and shear as well as imposing temporal variations in the environment. Additionally, comparisons will be drawn between model results and real storms, which demonstrated clear changes in behavior due to environmental variability.Finally, the Principal Investigators will build upon their recent work in helicity dynamics and the turbulent nature of both shallow and deep convection in an effort to understand the dynamics of scale selection, organization and predictability within deep convective storms. In prior research, simulated deep convection at various scales of initial forcing were used to determine whether convective storms evolve at the spatial scale of the initial forcing or instead evolved to some other preferred scale. These "scale-forced" simulations were compared to other results in which convection was initiated by a field of random disturbances. Preliminary findings, based on spectral and other analysis techniques, confirm that updrafts in the most supercell storms tend to be considerably larger in size then their less severe counterparts. When the initial storms are forced at a particular spatial scale, they tend to retain a memory of that scale, with the retention time proportional to the scale of forcing. Even when forced at scales much larger than the "natural or preferred scale," the supercell storms eventually settle into a scale larger than storms forced in weaker or zero shear. The Principal Investigators will expand the simulation data set with emphasis on identifying the most significant theoretical length scales of the flow and relating their structure and energetics to simulated storm behavior. Further, the Principal Investigators will seek to understand fundamental limits to storm and storm system predictability via a systematic analysis of error growth and propagation among scales. The latter is of particular importance to future operational prediction models.
这项研究的重点是深对流风暴动力学的研究,重点是三个相关的,但科学上不同的问题。 第一个是关于一些严重的(超级单体)风暴在相当有规律的时间间隔内发展成一系列中气旋的趋势。 在真实的风暴中已经观察到这种“循环中生”,并在一些数值模拟中注意到。 建议确定的条件(环境和风暴引起的),从非周期性风暴划定周期。 此外,首席调查员将把他们以前的工作扩展到龙卷风尺度,以研究周期性龙卷风的形成,重点是龙卷风涡旋环流和母体中气旋环流之间的多尺度联系。第二项研究旨在了解风暴和风暴系统的动力学,这些风暴和风暴系统在其整个或部分寿命期间,在切变和/或稳定性方面存在较大的水平和/或时间变化的环境中移动。 虽然已知环境变化在风暴生命周期中起着关键作用,但以前的云模型模拟利用了水平均匀的基态环境。 主要研究人员将通过进一步调查与风暴环境转变相关的动态,并通过结合不稳定性和切变的变化以及对环境的时间变化进行分析,来扩展先前的研究。 此外,还将对模式结果和真实的风暴进行比较,结果表明,由于环境的变化,风暴的行为发生了明显的变化。最后,主要研究人员将利用他们最近在螺旋度动力学以及浅对流和深对流的湍流性质方面的工作,努力了解深对流风暴中尺度选择、组织和可预测性的动力学。 在以前的研究中,模拟深对流在不同尺度的初始强迫被用来确定是否对流风暴演变的空间尺度的初始强迫或相反演变到一些其他的首选尺度。 这些“尺度强迫”的模拟进行了比较,对流是由一个领域的随机扰动。 基于光谱和其他分析技术的初步研究结果证实,大多数超级单体风暴中的上升气流往往比不太严重的风暴大得多。 当最初的风暴被迫在一个特定的空间尺度,他们往往会保留记忆的规模,与保留时间成正比的规模强迫。 即使在比“自然或首选尺度”大得多的尺度下,超级单体风暴最终也会比在较弱或零切变下的风暴更大。 主要研究人员将扩大模拟数据集,重点是确定流的最重要的理论长度尺度,并将其结构和能量与模拟风暴行为联系起来。 此外,首席研究员将通过对尺度间误差增长和传播的系统分析,寻求了解风暴和风暴系统可预测性的基本限制。 后者对未来的业务预测模型特别重要。

项目成果

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Kelvin Droegemeier其他文献

Stratified Turbulence in the Atmospheric Mesoscales
  • DOI:
    10.1007/s001620050085
  • 发表时间:
    1998-06-01
  • 期刊:
  • 影响因子:
    2.800
  • 作者:
    Douglas K. Lilly;Gene Bassett;Kelvin Droegemeier;Peter Bartello
  • 通讯作者:
    Peter Bartello

Kelvin Droegemeier的其他文献

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{{ truncateString('Kelvin Droegemeier', 18)}}的其他基金

Information Technology Research (ITR): Linked Environments for Atmospheric Discovery (LEAD)
信息技术研究 (ITR):大气发现的关联环境 (LEAD)
  • 批准号:
    0331594
  • 财政年份:
    2003
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Cooperative Agreement
Collaborative Research: Scale-Recursive Estimation of Precipitation for Applications to Quantitative Precipitation Forecast (QPF) Verification and Multisensor Estimation
合作研究:降水的尺度递归估计应用于定量降水预报(QPF)验证和多传感器估计
  • 批准号:
    0130396
  • 财政年份:
    2002
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Continuing Grant
National Symposium on the Great Plains Tornado Outbreak of May 3, 1999; Oklahoma City, Oklahoma; April 30-May 3, 2000
1999年5月3日全国大平原龙卷风爆发研讨会;
  • 批准号:
    0002255
  • 财政年份:
    2000
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Standard Grant
Research Experiences for Undergraduates at the Oklahoma Weather Center
俄克拉荷马州气象中心本科生的研究经验
  • 批准号:
    9820587
  • 财政年份:
    1999
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Standard Grant
1997 U.S.-Korea Seminar on Storm- and Mesoscale Weather Analysis and Prediction
1997年美韩风暴和中尺度天气分析与预测研讨会
  • 批准号:
    9722772
  • 财政年份:
    1997
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Standard Grant
Acquisition of Equipment to Create the Environmental Computing Applications System
购置设备以创建环境计算应用系统
  • 批准号:
    9512145
  • 财政年份:
    1995
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Standard Grant
Dynamics and Predictability of Convective Storms
对流风暴的动力学和可预测性
  • 批准号:
    9222576
  • 财政年份:
    1993
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Continuing Grant
Convective Modeling and Predictabilty Studies
对流模拟和可预测性研究
  • 批准号:
    8815371
  • 财政年份:
    1989
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Continuing Grant
Presidential Young Investigator: Simulation of Meso-and Convective Scale Dynamics
总统青年研究员:中观和对流尺度动力学模拟
  • 批准号:
    8657013
  • 财政年份:
    1987
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Continuing Grant
Numerical Simulation and Observational Analysis of Thunder- storms and Subcloud Phenomena
雷暴和亚云现象的数值模拟与观测分析
  • 批准号:
    8604402
  • 财政年份:
    1986
  • 资助金额:
    $ 47.29万
  • 项目类别:
    Continuing Grant

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MHDSSP:受到旋转和剪切作用的磁流体动力流中的自持过程和边缘状态
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    531527874
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    2024
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    Major Research Instrumentation
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ROBIN:基于旋转的屈曲不稳定性分析及其在新型软机构创建中的应用
  • 批准号:
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