冬季高频大风过程对渤海冬季环流和水交换影响的数值模拟  

The Effect of High Frequency Strong Winds on Winter Circulation and Water Exchange in the Bohai Sea by ROMS

作　　者：万修全[1,2] 马倩[1] 马伟伟[1] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100 [2]中国海洋大学物理海洋教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2015年第4期1-8,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41276013);2012年度教育部新世纪优秀人才支持计划;国家海洋局海洋公益性行业科研专项(201205018)资助

摘　　要：利用ROMS海洋模式和NCEP CFSR提供的日平均和月平均驱动场资料,对渤海冬季风生环流和水交换进行了数值模拟。结果显示:使用包含渤海冬季频繁出现的高频大风过程的日平均风场资料模拟的渤海冬季环流流速明显增强,与用观测资料归纳得到的渤海冬季环流分布吻合较好;大风过程对渤海冬季环流的贡献较大,无论强度或是流态,大风作用下的渤海流场结构在冬季占主导作用。同时大风作用通过控制渤海海峡处强烈的流出和流入,提高渤海与黄海之间热量交换以及水交换能力:通过渤海海峡进入渤海的热输运量显著增加,平衡渤海整体的热量收支;渤海水体平均存留时间缩短,整体水交换得到改善,而在月平均风场驱动结果中只存在缓慢的季节性变化。这显示渤海冬季大风过程的发生频率和强度有可能直接影响着渤海冬季的环流形态和长期变化,也影响着渤海水交换的强弱。The regional ocean model ROMS and different time-resolution wind data provided by NCEP CFSR are used to simulate the wind-driven circulation and water exchange in the Bohai Sea.The results of numerical simulations driven by daily and monthly averaged wind fields separately show that daily-averaged wind fields with high frequency strong wind signals lead to an obvious enhanced wind-driven circulation,which makes a good agreement with the observations during winter.Strong winds in winter not only have a greater contribution to both intensity and pattern of the wind-driven circulation,but also significantly increase the heat exchange between the Bohai Sea and the Yellow Sea by controlling strong inflows and outflows through the Bohai Strait.The average residence time in the Bohai Sea becomes shorter under the forcing of strong winds,which can indicate the improvement of water exchange capacity.On the other hand,there are only weak seasonal signals identified in the experiment of monthly mean wind forcing.Thus it hints us that the frequency and intensity of winter strong winds may have an important role on the long-term changes of wind-driven circulation and water exchange in the Bohai Sea during winter.

关 键 词：渤海 冬季环流 大风过程 数值模拟 

分 类 号：P731.27[天文地球—海洋科学]