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Variability of the Deep-Water Overflow in the Luzon Strait

机译：吕宋海峡深水溢流的变化

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The Luzon Strait, with its deepest sills at the Bashi Channel and Luzon Trough, is the only deep connection between the Pacific Ocean and the South China Sea (SCS). To investigate the deep-water overflow through the Luzon Strait, 3.5 yr of continuous mooring observations have been conducted in the deep Bashi Channel and Luzon Trough. For the first time these observations enable us to assess the detailed variability of the deep-water overflow from the Pacific to the SCS. On average, the along-stream velocity of the overflow is at its maximum at about 120m above the ocean bottom, reaching 19.9 ± 6.5 and 23.0 ± 11.8cm s~(-1) at the central Bashi Channel and Luzon Trough, respectively. The velocity measurements can be translated to a mean volume transport for the deep-water overflow of 0.83 ± 0.46 Sverdrups (Sv; 1Sv = 10~6m~3s~(-1)) at the Bashi Channel and 0.88 ± 0.77 Sv at the Luzon Trough. Significant intraseasonal and seasonal variations are identified, with their dominant time scales ranging between 20 and 60 days and around 100 days. The intraseasonal variation is season dependent, with its maximum strength taking place in March-May. Deep-water eddies are believed to play a role in this intraseasonal variation. On the seasonal time scale, the deep-water overflow intensifies in late fall (October-December) and weakens in spring (March-May), corresponding well with the seasonal variation of the density difference between the Pacific and SCS, for which enhanced mixing in the deep SCS is possibly responsible.
机译：吕宋海峡，在巴什海峡和吕宋海槽处有最深的基石，是太平洋和南中国海（SCS）之间的唯一深层连接。为了调查穿过吕宋海峡的深水溢流，在巴什海峡深部和吕宋海槽进行了3.5年的连续系泊观测。这些观察首次使我们能够评估从太平洋到南海的深水溢流的详细变化。平均而言，溢流的沿流速度在海底以上约120m处达到最大值，在中央的巴什海峡和吕宋海槽分别达到19.9±6.5和23.0±11.8cm s〜（-1）。速度测量结果可以转换为巴什海峡深水溢流的平均体积输运量为0.83±0.46 Sverdrups（Sv; 1Sv = 10〜6m〜3s〜（-1）），吕宋岛为0.88±0.77 Sv槽。确定了重要的季节内和季节变化，它们的主要时间尺度介于20天到60天之间以及大约100天之间。季节内变化取决于季节，其最大强度发生在三月至五月。据信深水涡在这种季节内变化中起作用。在季节尺度上，深水溢流在深秋（十月至十二月）加剧，在春季（三月至五月）减弱，这与太平洋和南海的密度差的季节变化很好地对应，为此加强了混合在深海中可能是负责任的。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第11期|2972-2986|共15页
  • 作者

    Chun Zhou; Wei Zhao; Jiwei Tian; Qingxuan Yang; Tangdong Qu;

  • 作者单位

    Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China;

    Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China;

    238 Songling Road, Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100, China;

    Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China;

    International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawai'i, Honolulu, Hawai'i;

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