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A numerical study on seasonal variations of the thermocline in the South China Sea based on the ROMS

ISSN号：0253-505X
期刊名称：Acta Oceanologica Sinica
时间：2014.7
页码：56-64
分类：P732[天文地球—海洋科学] Q959.12[生物学—动物学]
作者机构：[1]Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China, [2]Department of Ocean Science and Engineering, Zhejiang University, Hangzhou 310058, China
相关基金：The National Basic Research Program of China under contract Nos 2011CB403501 and 2012CB417402; the Fund for Creative Research Groups by National Natural Science Foundation of China under contract No. 41121064; the Knowledge Innovation Programs of the Chinese Academy of Sciences under contract No. KZCX2-YW-Q07-02; The authors would like to thank the High Performance Computing Center in the Institute of Oceanology, Chinese Academy of Sciences for supplying the computing environment.
相关项目：Stokes漂流对海洋上混合层影响程度的确定方法研究

关键词：中国南海, 温跃层, 数值研究, 季节性, 垂直温度分布, 混合动力, 海洋地形, 季节变化, thermocline, South China Sea, ROMS, typhoon

中文摘要：

根据为系统(ROMS ) 建模的地区性的海洋，在华南海(SCS ) 的 thermocline 的季节的变化数字地被调查。模仿的水动力学根据以前的研究：在 SCS 的发行量模式在冬季是气旋的并且在夏天，和如此的一个变化逆旋风被季风风主要驾驶。在巡航获得的建模的温度侧面和观察之间的错误在海洋的上面的层是相当小的，显示海洋地位相当被模仿。根据垂直温度侧面的形状，五种 thermocline 类型(浅 thermocline，深 thermocline，混合 thermocline，两倍 thermocline，和多重 thermocline ) 此处被定义。在冬季，什么时候在东北，季风占优势，在 SCS 的西北的很浅的架海很好被混合，并且没有明显的 thermocline。深区域通常有深 thermocline，并且混合或双的 thermocline 经常在 SCS 的南方在冷旋涡附近发生在区域。在夏天，当西南的季风占优势时，有浅 thermocline 的架海区域极大地膨胀。不同 thermocline 类型的分发与海洋深测术显示出一种关系：从对深水浅， thermocline 类型通常变化从对浅或混合深， thermocline，和双或多重的 thermocline 通常发生在陡峭的区域。三个主要 thermocline 特征(上面的界限深度，厚度，和紧张) 的季节的变化也被讨论。因为 SCS 也是热带气旋经常发生的一个区域，到在短时间规模的一个台风过程的 thermocline 的反应也被分析。

英文摘要：

On the basis of the regional ocean modeling system （ROMS）, the seasonal variations of the thermocline in the South China Sea （SCS） were numerically investigated. The simulated hydrodynamics are in accordance with previous studies： the circulation pattern in the SCS is cyclonic in winter and anticyclonic in summer, and such a change is mostly driven by the monsoon winds. The errors between the modeled temperature profiles and the observations obtained by cruises are quite small in the upper layers of the ocean, indicating that the ocean status is reasonably simulated. On the basis of the shapes of the vertical temperature profiles, five thermocline types （shallow thermocline, deep thermocline, hybrid thermocline, double thermocline, and multiple thermocline） are defined herein. In winter, when the northeasterly monsoon prevails, most shallow shelf seas in the northwest of the SCS are well mixed, and there is no obvious thermocline. The deep region generally has a deep thermocline, and the hybrid or double thermocline often occurs in the areas near the cold eddy in the south of the SCS. In summer, when the southwesterly monsoon prevails, the shelf sea area with a shallow thermocline greatly expands. The distribution of different thermocline types shows a relationship with ocean bathymetry： from shallow to deep waters, the thermocline types generally change from shallow or hybrid to deep thermocline, and the double or multiple thermocline usually occurs in the steep regions. The seasonal variations of the three major thermocline characteristics （the upper bound depth, thickness, and intensity） are also discussed. Since the SCS is also an area where tropical cyclones frequently occur, the response of thermocline to a typhoon process in a short time scale is also analyzed.