A new approach to equatorial inertial instability

解决赤道惯性不稳定的新方法

• 批准号: 1830098
• 负责人: Rudolf Kloosterziel
• 金额: $ 55.98万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1830098&HistoricalAwards=false
• 关键词: new; approach; equatorial; inertial; instability

Small-scale, near-equatorial instabilities are not resolved in ocean models, but their role in developing and maintaining large-scale currents is very important. This examination of equatorial inertial instability will significantly improve the understanding of the role that the instability plays in the destabilization and equilibration of ocean currents in equatorial regions. New theories will also be developed to help advance our knowledge in inertial instability in the near-equatorial regions. By studying these instabilities, their effects can be predicted and, hence, be parameterized in ocean models. Improvement in ocean modeling can have important impact on climate research because of the essential role that the equatorial ocean plays in controlling the climate. A comprehensive study of symmetric instability of parallel shear flows for the equatorial beta-plane will be conducted by incorporating the full Coriolis force with a focus on the stratified fluid cases. Results will be contrasted with the commonly used traditional beta-plane approximation. The potentially extremely rapid downward mixing resulting from the instability with the 'true' Coriolis force suggests that the traditional approximation is a very poor one. Under terrestrian circumstances the horizontal scales are disturbingly small and therefore never resolved in global ocean circulation models. The correct redistribution of momentum, downward buoyancy flux and energy dissipation are thus not accurately accounted for. This research will help in determining the correct parameterizations of these processes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在海洋模型中，小规模，近乎赤道的不稳定性未解决，但是它们在开发和维持大规模电流中的作用非常重要。对赤道惯性不稳定的研究将显着提高人们对不稳定性在赤道区域中洋流的不稳定和平衡中所扮演的作用的理解。还将开发新的理论，以帮助促进我们在近乎赤道地区的惯性不稳定方面的知识。通过研究这些不稳定性，可以预测它们的效果，因此可以在海洋模型中进行参数化。海洋建模的改进可能对气候研究产生重要影响，因为赤道海洋在控制气候中起着至关重要的作用。赤道β平面平行剪切流的对称不稳定性的全面研究将通过掺入完整的Coriolis力，重点关注分层的流体病例。结果将与常用的传统β平面近似形成对比。与“真”科里奥利力的不稳定性导致的潜在非常快速的向下混合表明，传统的近似值非常差。在陆地情况下，水平尺度很小，因此在全球海洋循环模型中永远不会解决。因此，不准确考虑了动量，向下浮力通量和能量耗散的正确重新分布。这项研究将有助于确定这些过程的正确参数化。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评论标准来评估值得支持的。