Study on oceanic thermocline structure in subtropical/subpolar gyres

副热带/副极地环流海洋温跃层结构研究

• 批准号: 10640414
• 负责人: KUBOKAWA Atsushi
• 金额: $ 1.54万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640414/
• 关键词: Ocean circulation; Thermocline; Eastern boundary ventilation; Cross-gyre flow; Oceanic response; Planetary waves; Ventilated thermocline theory; Eastern Boundary Vantilation; 水温躍層構造; Ventilated Thermocline; Cross-gyre ventilation

Numerical experiments with idealized OGCM were carried out to investigate the oceanic eastern boundary structure and its effects on the thermocline structure. The experimental results indicate that the zonal flow in the vicinity of the eastern boundary is limited in the mixed-layer, which is realized by the density gap just above the thermocline. Diapycnal process does not act an important role at the eastern edge of the basin except in the mixed layer. Formulation for the eastern boundary structure is also presented. It was also shown that such eastern boundary structure strongly affects the thermocline in the interior region. On the shallow thermocline in the subtropics, eastern boundary ventilated region is emerged, which is identified as a region of high potential vorticity. In the deep thermocline, which does not outcrop in the subtropical, a cross-gyre ventilation occurs. This cross-gyre ventilation is caused by the density structure at the eastern boundary.In addition to the above work, we carried out theoretical studies on the response of oceanic thermocline to enhancement of Ekman pumping velocity, and on the planetary wave dynamics in 2.5-layer ventilated thermocline model.

进行了理想化的OGCM的数值实验，以研究海洋东部边界结构及其对热级别结构的影响。实验结果表明，在混合层中，东部边界附近的区域流量受到限制，这是由热层上方上方的密度间隙实现的。除混合层外，二比过程在盆地的东边缘没有发挥重要作用。还提出了东部边界结构的配方。还表明，这种东部边界结构强烈影响内部区域的热跃层。在亚热带的浅热跃层上，出现了东部边界通风区域，该区域被确定为高电位涡度的区域。在不露出亚热带的深热跃层中，发生了交叉通风。这种交叉通风是由东部边界处的密度结构引起的。在上述工作中，我们对海洋热跃层对增强Ekman泵送速度的响应的响应进行了理论研究，以及在2.5层的ventilerated热量线模型中的行星波动力学。