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首页> 外文期刊>Journal of Physical Oceanography >Formation Mechanism of Barrier Layer in the Subtropical Pacific
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Formation Mechanism of Barrier Layer in the Subtropical Pacific

机译：亚热带太平洋屏障层形成机理

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摘要

Seasonal and interannual variations of the barrier layer (BL) and its formation mechanism in the subtropical North and South Pacific were investigated by using raw and gridded Argo profiling float data and various surface flux data in 2003-12 and hydrographic section data from the World Ocean Circulation Experiment Hydrographic Programme. BLs detected by raw Argo profiles, which existed within the sea surface salinity (SSS) front located on the equator side of SSS maxima, were thickest and most frequent in winter and had a temporal scale shorter than 10 days, indicating their transient nature. Surface and subsurface processes for the BL formation suggested by previous studies were evaluated. Poleward Ekman advection of fresher water was dominant as the surface freshening process but cannot explain the observed seasonal variations of the BL. Subsurface equatorward intrusion of high-salinity tropical water was too deep to produce salinity stratification within isothermal layers. These results strongly suggest that BLs in the subtropical Pacific are formed mainly through tilting of the SSS front due to the poleward Ekman flow near the sea surface and the equatorward geostrophic flow in the subsurface. This idea is supported by the dominant contribution of the meridional SSS gradient to the meridional sea surface density gradient within the SSS front and the correspondence between the seasonal variations of the BL and isothermal layer depth. On an interannual time scale, the winter BL thickness in the North and South Pacific was related to the Pacific decadal oscillation and the El Nino-Southern Oscillation, respectively, through the intensity of trade winds controlling isothermal layer depth.
机译：利用原始和网格化的Argo剖面浮标数据和2003-12年的各种表面通量数据以及来自世界海洋的水文剖面数据，研究了北亚和南太平洋副热带地区阻挡层（BL）的季节和年际变化及其形成机理。循环实验水文计划。由原始Argo剖面检测到的BLs存在于SSS最大值赤道侧的海面盐度（SSS）锋面内，在冬季最厚，最频繁，且时间尺度短于10天，表明它们是短暂的。评估了先前研究建议的BL形成的表面和地下过程。极地淡水的Poleward Ekman平流在表面清新过程中占主导地位，但不能解释观测到的BL季节变化。高盐度热带水的地下赤道侵入太深，无法在等温层内产生盐分分层。这些结果有力地表明，由于海面附近的极地埃克曼流和地下的赤道地转流，亚热带太平洋的BLs主要是通过SSS锋面的倾斜形成的。子午线SSS梯度对SSS锋面内子午海表面密度梯度的主要贡献以及BL的季节变化与等温层深度之间的对应关系支持了这一观点。在每年的时间尺度上，北太平洋和南太平洋的冬季BL厚度分别通过控制等温层深度的逆风强度与太平洋年代际振荡和厄尔尼诺-南方涛动有关。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第11期|2790-2805|共16页
  • 作者

    Katsura Shota; Oka Eitarou; Sato Kanako;

  • 作者单位

    Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba 2778564, Japan;

    Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba 2778564, Japan;

    Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa 2370061, Japan;

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