Towards the Upper-Ocean Unbalanced Submesoscale Motions in the Oleander Observations

被引:5
作者
Cao, Haijin [1 ,2 ]
Fox-Kemper, Baylor [3 ]
Jing, Zhiyou [4 ]
Song, Xiangzhou [1 ,2 ]
Liu, Yuyi [4 ]
机构
[1] Hohai Univ, Key Lab Marine Hazards Forecasting, Minist Nat Resources, Nanjing, Peoples R China
[2] Hohai Univ, Coll Oceanog, Nanjing, Peoples R China
[3] Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI USA
[4] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
基金
中国国家自然科学基金;
关键词
Ageostrophic circulations; Eddies; Ocean dynamics; Small scale processes; INTERNAL GRAVITY-WAVES; SEA-SURFACE HEIGHT; KINETIC-ENERGY; CIRCULATION; MESOSCALE; PARAMETERIZATION; DECOMPOSITION; SEASONALITY; TRANSITION; TURBULENCE;
D O I
10.1175/JPO-D-22-0134.1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Oceanic submesoscale dynamics with horizontal scales < 20 km have similar temporal and spatial scales as internal gravity waves (IGWs), but they differ dynamically and have distinct impacts on the ocean. Separating unbalanced submesoscale motions (USMs), quasi-balanced submesoscale motions (QBMs), and IGWs in observations remains a great challenge. Based on the wave-vortex decomposition and the vertical scale separation approach for distinguishing IGWs and USMs, the long-term repeat Oleander observations in the Gulf Stream region provide an opportunity to quantify these processes separately. Here in this study, the role of USMs in the divergence is emphasized, which has confounded the wave-vortex decomposition of wintertime data in previous analyses. We also adopt the vertical filtering approach to iden-tify the USMs by applying a high-pass filter to the vertical scales, as USMs are characterized by smaller vertical scales. This approach is tested with submesoscale-permitting model data to confirm its effectiveness in filtering the submesoscale veloc-ity perturbations, before being applied to the compiled velocity data of the Oleander dataset (years 2005-18). The results show that the averaged submesoscale eddy kinetic energy by USMs can reach ;1 X 10(-3) m(2) s(-2) at z =-30 min winter, much stronger than found in other seasons. Importantly, this study exemplifies the possibility of obtaining USMs from ex -isting ADCP observations and reveals the seasonal dynamical regimes for the submesoscales.
引用
收藏
页码:1123 / 1138
页数:16
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