The vertical structure of upper ocean variability at the Porcupine Abyssal Plain during 2012-2013.
The vertical structure of upper ocean variability at the Porcupine Abyssal Plain during 2012-2013.
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DOI：
10.1002/2015jc011423
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发表时间：
2016-05
影响因子：
3.6
通讯作者：
Kaiser, Jan
中科院分区：
文献类型：
--
作者：
Damerell, Gillian M.;Heywood, Karen J.;Thompson, Andrew F.;Binetti, Umberto;Kaiser, Jan
本文研究了东北大西洋一整年的温度、盐度和氧浓度的变化特征，包括变化的垂直结构。垂直分辨率在0.5到1米之间的海洋滑翔机的连续剖面比在有限数量的固定深度的系泊传感器的时间序列提供了更多关于整个水柱时间变化的信息。在每个深度测量热量、盐和溶解氧含量。虽然近地表热含量与净地表热通量一致，但深层热含量受环流尺度水团变化的驱动。在~ 150m以下，热量和盐含量表现出季节内的变化，这在以前的研究中尚未得到解决。在水质量特性的功率谱中检测到一个1型斜压内潮。温度和盐度的最小变率深度在~ 415m，但这是氧浓度高变率的深度。深层变率主要是地中海水的间歇性出现，这显示了细丝的证据。在一年的大部分时间里，大部分水柱都容易受到盐指侵蚀。在大约700-900米之间，水柱易受扩散分层的影响，特别是当有地中海水存在时。这种解决高度垂直和时间变率的独特能力突出了上层海洋热量和盐含量的季节内变率的重要性，这些变化可能被传统观测技术所掩盖。上层海洋温度和盐度的季节内变化，以前未报道的模态- 1斜压内潮检测到由地中海水域间歇性斑块主导的深度变化，这表明了丝状的证据
This study presents the characterization of variability in temperature, salinity and oxygen concentration, including the vertical structure of the variability, in the upper 1000 m of the ocean over a full year in the northeast Atlantic. Continuously profiling ocean gliders with vertical resolution between 0.5 and 1 m provide more information on temporal variability throughout the water column than time series from moorings with sensors at a limited number of fixed depths. The heat, salt and dissolved oxygen content are quantified at each depth. While the near surface heat content is consistent with the net surface heat flux, heat content of the deeper layers is driven by gyre‐scale water mass changes. Below ∼150m, heat and salt content display intraseasonal variability which has not been resolved by previous studies. A mode‐1 baroclinic internal tide is detected as a peak in the power spectra of water mass properties. The depth of minimum variability is at ∼415m for both temperature and salinity, but this is a depth of high variability for oxygen concentration. The deep variability is dominated by the intermittent appearance of Mediterranean Water, which shows evidence of filamentation. Susceptibility to salt fingering occurs throughout much of the water column for much of the year. Between about 700–900 m, the water column is susceptible to diffusive layering, particularly when Mediterranean Water is present. This unique ability to resolve both high vertical and temporal variability highlights the importance of intraseasonal variability in upper ocean heat and salt content, variations that may be aliased by traditional observing techniques. Intraseasonal variability in upper ocean temperature and salinity, not previously reported Mode‐1 baroclinic internal tide detected Deep variability dominated by intermittent patches of Mediterranean Water, which show evidence of filamentation