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Mean Structure and Variability of the Cold Dome Northeast of Taiwan

机译：台湾东北部冷圆顶的平均结构和变异性

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摘要

The "cold dome" off northeastern Taiwan is one of the distinctive oceanic features in the seas surrounding Taiwan. The cold dome is important because persistent upwelling makes the region highly biologically productive. This article uses historical data, recent observations, and satellite-observed sea surface temperatures (SST) to describe the mean structure and variability of the cold dome. The long-term mean position of the cold dome, using the temperature at 50 m depth as a reference, is centered at 25.625°N, 122.125°E. The cold dome has a diameter of approximately 100 km, and is maintained by cold (< 21℃) and salty (> 34.5) waters upwelled along the continental slope. The ocean currents around the cold dome, although weak, flow counterclockwise. The monsoon-driven winter intrusion of the Kuroshio current onto the East China Sea shelf intensifies the upwelling and carries more subsurface water up to the cold dome than during the summer monsoon season. On a shorter timescale, the cold dome's properties can be significantly modified by the passage of typhoons, which creates favorable physical conditions for short-term Kuroshio intrusions in summer. The surface expression of the cold dome viewed from satellite SST images is often not domelike but instead is an irregular shape with numerous filaments, and thus may contribute substantially to shelf/slope exchange. As a result of persistent upwelling, typhoon passage, and monsoon forcing, higher chlorophyll α concentrations, and thus higher primary productivity, are frequently observed in the vicinity of the cold dome.
机译：台湾东北部的“冷圆顶”是台湾周围海洋的独特海洋特征之一。寒冷的穹顶很重要，因为持续不断的上升使该地区具有很高的生物生产力。本文使用历史数据，最近的观测结果以及卫星观测的海面温度（SST）来描述冷穹顶的平均结构和变异性。以50 m深度的温度为参考，冷圆顶的长期平均位置以25.625°N，122.125°E为中心。冷圆顶的直径约为100 km，并由沿大陆坡上升的冷水（<21℃）和咸水（> 34.5）保持。冷穹顶周围的洋流虽然微弱，却逆时针方向流动。季风驱动的冬季黑潮涌入东海陆架加剧了上升流，并且比夏季季风季节更多地将地下水带到冷圆顶。在较短的时间范围内，可以通过台风的作用大大改变冷圆顶的性质，这为夏季短期黑潮入侵创造了有利的物理条件。从卫星SST图像观察到的冷圆顶的表面表达通常不是圆顶状，而是具有许多细丝的不规则形状，因此可能会大大有助于架子/斜坡的交换。由于持续不断的上升流，台风通过和季风强迫作用，经常在冷圆顶附近观测到较高的叶绿素α浓度，因此较高的初级生产力。

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  • 来源
    《Oceanography》 |2011年第4期|p.100-109|共10页
  • 作者

    SEN JAN; CHUNG-CHI CHEN; YA-LINC TSAI; YIINC JIANG YANG; JOE WANG; CHING-SHENG CHERN; GLEN G AWA R K I E Wl CZ; REN-CHIEH LIEN; LUCA CENTURIONI; JIA-YU KUO;

  • 作者单位

    Institute of Oceanography, National Taiwan University, Taipei, Taiwan;

    Department of Life Science, National Taiwan Normal University, Taipei, Taiwan;

    Institute of Oceanography, National Taiwan University, Taipei, Taiwan;

    Department of Oceanography, Chinese Naval Academy, Kaohsiung, Taiwan;

    Institute of Oceanography, National Taiwan University, Taipei, Taiwan;

    Institute of Oceanography, National Taiwan University, Taipei, Taiwan;

    Woods Hole Oceanographic Institution, Woods Hole, MA, USA;

    Applied Physics Laboratory, University of Washington, Seattle, WA, USA;

    Scripps Institution of Oceanography, La Jolla, CA, USA;

    Institute of Oceanography, National Taiwan University, Taipei, Taiwan;

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