Open-Ocean Submesoscale Motions: A Full Seasonal Cycle of Mixed Layer Instabilities from Gliders
Open-Ocean Submesoscale Motions: A Full Seasonal Cycle of Mixed Layer Instabilities from Gliders
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DOI：
10.1175/jpo-d-15-0170.1
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发表时间：
2016-04
影响因子：
3.5
通讯作者：
A. Thompson;A. Lazar;Christian E. Buckingham;A. N. Garabato;G. Damerell;K. Heywood
中科院分区：
文献类型：
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作者：
A. Thompson;A. Lazar;Christian E. Buckingham;A. N. Garabato;G. Damerell;K. Heywood
摘要亚中尺度不稳定性，特别是混合层斜压不稳定性和对称不稳定性，对上层海洋混合和能量的重要性在黑潮和墨西哥湾流等强、持续锋面地区得到了充分的证明。很少有人注意到研究亚中尺度流动的开放的海洋，远离长期的，平均地转锋的特点，很大一部分的全球海洋。这项研究提出了一个长达一年的，亚中尺度分辨时间序列的近表面浮力梯度，位涡和不稳定性的特点，收集的海洋滑翔机，提供洞察开放海洋亚中尺度动力学在一个完整的年度周期。滑翔机在亚热带东北大西洋225平方公里的区域连续采样，测量沿着292短（约20公里）水文剖面的温度，盐度和压力。滑翔机的观测显示，近地表的分层有季节性的循环。整个秋季（9月至11月），
AbstractThe importance of submesoscale instabilities, particularly mixed layer baroclinic instability and symmetric instability, on upper-ocean mixing and energetics is well documented in regions of strong, persistent fronts such as the Kuroshio and the Gulf Stream. Less attention has been devoted to studying submesoscale flows in the open ocean, far from long-term, mean geostrophic fronts, characteristic of a large proportion of the global ocean. This study presents a year-long, submesoscale-resolving time series of near-surface buoyancy gradients, potential vorticity, and instability characteristics, collected by ocean gliders, that provides insight into open-ocean submesoscale dynamics over a full annual cycle. The gliders continuously sampled a 225 km2 region in the subtropical northeast Atlantic, measuring temperature, salinity, and pressure along 292 short (~20 km) hydrographic sections. Glider observations show a seasonal cycle in near-surface stratification. Throughout the fall (September–November...