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.

小尺度、近赤道不稳定性在海洋模式中没有得到解决，但它们在发展和维持大尺度海流方面的作用非常重要。对赤道惯性不稳定性的这种研究将大大提高对不稳定性在赤道地区洋流的不稳定和平衡中所起作用的理解。还将发展新的理论，以帮助提高我们对近赤道区域惯性不稳定性的认识。通过研究这些不稳定性，可以预测其影响，从而在海洋模型中进行参数化。由于赤道海洋在控制气候方面起着至关重要的作用，海洋模拟的改进对气候研究有着重要的影响。通过将全部科里奥利力与分层流体情况相结合，将对赤道β平面平行剪切流的对称不稳定性进行全面的研究。结果将与常用的传统β-平面近似进行对比。潜在的非常快速的向下混合所造成的不稳定性与“真正的”科里奥利力表明，传统的近似是一个非常差的。在陆地环境下，水平尺度小得令人不安，因此在全球海洋环流模型中从未解决过。因此，动量的正确再分配、向下浮力通量和能量耗散没有得到准确的解释。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。