Seasonal evolution of the Yellow Sea Cold Water Mass and its interactions with ambient hydrodynamic system
Seasonal evolution of the Yellow Sea Cold Water Mass and its interactions with ambient hydrodynamic system
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黄海冷水团季节演变及其与环境水动力系统的相互作用
DOI：
10.1002/2016jc012186
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发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
Fan Zhisong
中科院分区：
文献类型：
--
作者：
Qiao Lulu;Liu Shidong;Sun Pingkuo;Fan Zhisong
黄海冷水团是南黄海水动力系统的重要组成部分。然而，其复杂的相互作用与周围的流在很长的时间尺度没有完全理解。本文介绍了一个安装在海底的声学多普勒海流剖面仪（ADCP）在西太平洋部署了近一年的数据集的分析。它使我们能够研究YSCWM的演变，包括潮流的季节性变化，近惯性振荡（NIOs）以及台风和冬季风暴引起的风力驱动的水流。在混合层底部附近和密度跃层中存在较强的NIOs，其最大流速在夏季接近20 cm·s-1，且流速方向几乎相反。YSCWM还可以抑制由于台风引起的水柱中能量的直接向下输送。相反，水动力系统也反馈影响YSCWM的变化。在密度跃层顶部附近产生20 cm·s-1·m-1的大电流切变。通常，密度跃层的强度和深度分别决定了S的大小和垂直位置。基于月平均密度剖面资料、Richardson数和小波分析，认为NIO能够在密度跃层周围引起主导的剪切不稳定。然而，NIO不足以影响较低的YSCWM。此外，在秋季，每两周一次的大潮对应着近2°C的底温升高，表明潮流是YSCWM下降的主要水动力驱动力。
The Yellow Sea Cold Water Mass (YSCWM) is an important component of the hydrodynamic system in the South Yellow Sea (SYS). However, its intricate interactions with the ambient flows over long time scales are not fully understood. This paper presents the analysis of the data set obtained from a seabed‐mounted Acoustic Doppler Current Profiler (ADCP) deployed for nearly 1 year in the western SYS. It allowed us to study the evolution of YSCWM, including the seasonal changes of tidal currents, near‐inertial oscillations (NIOs), and the wind‐driven currents due to typhoons and winter storms. Strong NIOs were found near the bottom of mixed layer and in the pycnocline with nearly opposite current directions, with maximum velocity of nearly 20 cm·s−1 in summer. The YSCWM can also inhibit the direct downward energy transport in the water column due to typhoons. Conversely, the hydrodynamic system also feeds back to influence the change of YSCWM. A large current shear (S) of 20 cm·s−1·m−1 is generated near the top of pycnocline. Generally, the intensity and depth of the pycnocline determine S's magnitude and vertical location, respectively. Based on the monthly averaged density profile data, the Richardson number and wavelet analysis, the NIOs are considered to be capable of inducing predominant shear instability around the pycnocline. However, the NIOs are not strong enough to influence the lower YSCWM. In addition, in autumn, each fortnightly spring tide corresponds with a bottom temperature increase of nearly 2°C, indicating that tidal currents are the leading hydrodynamic driving force to decline the YSCWM.
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影响因子：
2.3
作者：
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通讯作者：
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影响因子：
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作者：
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