Bottom and Deep water formation due to the interaction of convective and baroclinic instabilities

由于对流和斜压不稳定性的相互作用而形成底部和深水

• 批准号: 20540423
• 负责人: AKITOMO Kazunori
• 金额: $ 2.75万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20540423/
• 关键词: 海洋物理学; 対流; 傾圧不安定; 高緯度海域; 底・深層水; 軽圧不安定

To investigate the interaction of convective and baroclinic instabilities, 3-D model experiments have been executed using a nonhydrostatic equation system. The baroclinic flow becomes unstable to develop into pairs of cyclonic and anticyclonic eddies in the convective mixed layer after cooling sets on. Properties of anticyclonic eddies resemble those of submesoscale coherent vortices(SCVs) which have been often observed in polar oceans. The downward transport associated with the eddies increases with background slope of isopycnals. It is needed to take into account the effects of diabatic processes(convection) for better parameterization of the eddy transport in a general circulation model.

为了研究对流不稳定和斜压不稳定的相互作用，利用非静力方程组进行了三维模式试验。冷却开始后，斜压气流变得不稳定，在对流混合层中发展成成对的气旋性和反气旋性涡旋，反气旋性涡旋的性质类似于极地海洋中经常观测到的亚中尺度相干涡旋（SCV）。与涡旋相关的向下输送随等密度线背景斜率的增大而增大。在大气环流模式中，为了更好地参数化涡动输送，需要考虑非绝热过程（对流）的影响。

项目成果

Baroclinic instability and submesoscale eddy formation in weakly stratified oceans under cooling

冷却下弱分层海洋的斜压不稳定性和亚中尺度涡流形成

• DOI: 10.1029/2010jc006125
• 发表时间: 2010
• 期刊: Journal of Geophysical Research
• 作者: Akitomo;K
• 通讯作者: K

Two types of thermo baric deep convection possible in the Greenland Sea

格陵兰海可能存在两种类型的温压深对流

• DOI: 10.1029/2010jc006635
• 发表时间: 2011
• 期刊: Journal of Geophysical Research
• 作者: Akitomo;K
• 通讯作者: K