The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle
The Vertical Structure of Open-Ocean Submesoscale Variability during a Full Seasonal Cycle
复制标题
全季节循环期间公海次尺度变率的垂直结构
DOI：
10.1175/jpo-d-19-0030.1
复制
发表时间：
2020
影响因子：
3.5
通讯作者：
Erickson Z
中科院分区：
文献类型：
--
作者：
Erickson Z
次中尺度动力学通常在边界处增强，并假定在开阔海洋中的混合层以下减弱。在这里，我们评估的季节性和亚中尺度运动的垂直分布在大西洋东北部的公海区域。二阶结构函数，或由距离分开的属性的方差，计算从亚中尺度分辨海洋滑翔机和系泊观测，以及1/48°数值海洋模式。该数据集结合了贯穿整个季节周期的时间覆盖范围，捕获小至1公里的空间尺度的水平分辨率，以及在1000米以上提供近乎连续覆盖的垂直采样。虽然动能和势能经历了一个季节性的循环，是最大的在冬季，结构功能斜率，动力学特性的影响，不表现出很强的季节性。此外，结构函数斜率显示弱的垂直变化，有没有一个强烈的变化，在整个基地的混合层的属性。此外，我们将观测结果与高分辨率数值模型的输出进行了比较。该模型不代表与超惯性运动相关的变异性，也没有捕捉到春季整个水柱中发生的亚中尺度动能的减少。总体而言，这些结果表明，在整个弱分层的次极地模式沃茨的混合层次中尺度变率转移到传统定义的混合层以下的深度是很重要的。
Submesoscale dynamics are typically intensified at boundaries and assumed to weaken below the mixed layer in the open ocean. Here, we assess both the seasonality and the vertical distribution of submesoscale motions in an open-ocean region of the northeast Atlantic. Second-order structure functions, or variance in properties separated by distance, are calculated from submesoscale-resolving ocean glider and mooring observations, as well as a 1/48° numerical ocean model. This dataset combines a temporal coverage that extends through a full seasonal cycle, a horizontal resolution that captures spatial scales as small as 1 km, and vertical sampling that provides near-continuous coverage over the upper 1000 m. While kinetic and potential energies undergo a seasonal cycle, being largest during the winter, structure function slopes, influenced by dynamical characteristics, do not exhibit a strong seasonality. Furthermore, structure function slopes show weak vertical variations; there is not a strong change in properties across the base of the mixed layer. Additionally, we compare the observations to output from a high-resolution numerical model. The model does not represent variability associated with superinertial motions and does not capture an observed reduction in submesoscale kinetic energy that occurs throughout the water column in spring. Overall, these results suggest that the transfer of mixed layer submesoscale variability down to depths below the traditionally defined mixed layer is important throughout the weakly stratified subpolar mode waters.
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DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
J. Klymak;W. Crawford;M. Alford;J. MacKinnon;R. Pinkel
通讯作者：
R. Pinkel
影响因子：
16.6
作者：
Su Z;Wang J;Klein P;Thompson AF;Menemenlis D
通讯作者：
Menemenlis D
影响因子：
3.7
作者：
Jin-Han Xie;J. Vanneste
通讯作者：
Jin-Han Xie;J. Vanneste
影响因子：
3.5
作者：
K. McCaffrey;B. Fox‐Kemper;G. Forget
通讯作者：
K. McCaffrey;B. Fox‐Kemper;G. Forget
影响因子：
5.2
作者：
Xiaolong Yu;A. Ponte;S. Elipot;D. Menemenlis;E. Zaron;R. Abernathey
通讯作者：
Xiaolong Yu;A. Ponte;S. Elipot;D. Menemenlis;E. Zaron;R. Abernathey