| 摘要: |
| 为探究渤海冬季风生环流的年际变化及机制, 在近35年NCEP CFSR大气强迫下, 利用ROMS海洋模式对渤海冬季流场进行了高分辨率的数值模拟。模式结果基本重现了已知的渤海冬季风生环流的主要特征。渤海冬季深度平均流场的EOF结果显示: 首先, 第一模态中风向的改变引起了一个环绕整个渤海的环流结构变化; 其次, 第二模态反映了渤海冬季环流存在的线性增强趋势与风场增强有关, 尤其在1995年之后。从模式结果中发现, 风场对渤海冬季流场存在的年际变化起到重要作用, 风向的偏转对环流年际特征的影响强于风速变化。 |
| 关键词: 渤海 风生环流 冬季 ROMS 数值模拟 年际变化 |
| DOI：10.11693/hyhz20150100009 |
| 分类号: |
| 基金项目:国家自然科学基金项目, 41276013号, 41576004号, U1406401号; 教育部留学回国人员科研启动基金, 教外司留[2012]1707号; 2012年度教育部新世纪优秀人才支持计划, NCET-12-0502号。 |
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| INTERANNUAL VARIATION AND FORMATION OF WIND-DRIVEN CURRENTS OF BOHAI SEA IN WINTER |
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MA Wei-Wei1, WAN Xiu-Quan1,2, WAN Kai3
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1.Department of oceanography, College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;2.Key Laboratory of Physical Oceanography MOE China, Ocean University of China, Qingdao 266100, China;3.North China Sea Marine Engineering Prospecting Institute, North China Sea Branch of State Oceanic Administration, Qingdao 266033, China
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| Abstract: |
| Based on the high-resolution ROMS (Regional Ocean Modeling System) model with daily wind-forcing data provided by NCEP CFSR, we conducted a numerical simulation on 35-year-long wind-driven circulation in winter in Bohai Sea, North China. Empirical Orthogonal Function (EOF) decomposition was applied to the vertical averaged currents. The results indicate that the change in wind forcing plays a major role in the interannual variation of the winter circulation system. Firstly, change in wind direction is significantly related with the 1st EOF mode and has an impact on the cyclonic structure of currents in the central Bohai Sea. Secondly, the increase of wind strength is related with the 2st EOF mode and may result in an increasing trend of currents of Bohai Sea in winter, especially from 1995. Therefore, change in wind direction affects more the interannual variation of wind-driven current than change in wind strength does. |
| Key words: Bohai Sea wind-driven current winter ROMS numerical simulation interannual variation |
