Intensified diapycnal mixing in the midlatitude western boundary currents.
Intensified diapycnal mixing in the midlatitude western boundary currents.
复制标题
中纬度西部边界流中的二重混合增强。
DOI：
10.1038/srep07412
复制
发表时间：
2014-12-10
影响因子：
4.6
通讯作者：
Wu L
中科院分区：
文献类型：
--
作者：
Jing Z;Wu L
风对海洋近惯性运动的功在提供深海的穿透混合中起着重要作用，而穿透混合影响着海洋对热量和碳的吸收以及气候变化。然而，这仍然是一个谜，近惯性能量渗透到深海的位置和通过何种途径。利用2005年1月在黑潮延伸区的观测资料，我们证明了温跃层和深海中的穿膜混合与风生近惯性内波的切变方差密切相关，其穿膜扩散率为6 × 10−5 m2 s −1，几乎比环流环流中的强一个数量级。 据估计，45%-62%的局部近惯性风功4.5 × 10−3 Wm−2辐射到温跃层和深海，占提供混合所需能量的42%-58%。 高混合的建议，以维持高能量的近惯性风的工作和强涡流活动，导致增强向下近惯性能量通量比以前的研究结果。西边界流是近惯性能向深海渗透的关键区域，也是冬季底涡混合的热点。
The wind work on oceanic near-inertial motions is suggested to play an important role in furnishing the diapycnal mixing in the deep ocean which affects the uptake of heat and carbon by the ocean as well as climate changes. However, it remains a puzzle where and through which route the near-inertial energy penetrates into the deep ocean. Using the measurements collected in the Kuroshio extension region during January 2005, we demonstrate that the diapycnal mixing in the thermocline and deep ocean is tightly related to the shear variance of wind-generated near-inertial internal waves with the diapycnal diffusivity 6 × 10−5 m2s−1 almost an order stronger than that observed in the circulation gyre. It is estimated that 45%–62% of the local near-inertial wind work 4.5 × 10−3 Wm−2 radiates into the thermocline and deep ocean and accounts for 42%–58% of the energy required to furnish mixing there. The elevated mixing is suggested to be maintained by the energetic near-inertial wind work and strong eddy activities causing enhanced downward near-inertial energy flux than earlier findings. The western boundary current turns out to be a key region for the penetration of near-inertial energy into the deep ocean and a hotspot for the diapycnal mixing in winter.
登录
查看更多内容
影响因子：
3.6
作者：
GREGG, MC;KUNZE, E
通讯作者：
KUNZE, E
影响因子：
56.9
作者：
Polzin, KL;Toole, JM;Schmitt, RW
通讯作者：
Schmitt, RW
影响因子：
3.5
作者：
Saenko, OA;Merryfield, WJ
通讯作者：
Merryfield, WJ
影响因子：
3.5
作者：
Kunze, Eric;Firing, Eric;Thurnherr, Andreas M.
通讯作者：
Thurnherr, Andreas M.
影响因子：
3.6
作者：
GARGETT, AE
通讯作者：
GARGETT, AE