摘要
海面风不仅是驱动上层海洋运动的主要动力,其能量也是维持海洋表层流动的主要机械能来源。为了分析南海表层流风能输入的变化,用SODA(Simple Ocean Data Assimilation)(1901—2010)资料估算了风向南海表层流(表层地转流+表层非地转流)的能量输入。结果表明,风向南海表层流、表层地转流和表层非地转流输入的能量总体均呈减少趋势, 110年间分别减小了约56%、65%和49%。导致风能输入减小的最主要因素是风应力的减弱(减小了35%)。由于南海受季风系统的控制,风向表层流及其各成分输入的能量呈现出显著的季节性变化。冬季风能输入最强,高值区位于南海西部及北部区域,呈一个显著的"回力镖"状结构。这些结果对深入认识南海环流具有理论意义。
Sea surface wind is not merely a major driving force to the upper-ocean currents;the wind energy input is the main source of mechanical energy to keep these currents moving.To analyze the secular trend of wind energy input into the South China Sea(SCS),we calculate the wind energy input into the surface current,surface geostrophic current and surface ageostrophic current from1901and2010by using SODA(v2.2.4)data.The results show that during the past110years,the trend of the wind energy input into surface current,surface geostrophic current and surface ageostrophic current decreased on the whole.The reducing amplitude is56%,65%and49%,respectively.The dominant factor is the decline of wind stress(about35%).Due to the monsoon systems,seasonal variation of wind energy input into the SCS is significant.In winter,the wind energy input is the strongest,mainly in the north and west parts of the basin,and the shape of energy input distribution is like a“boomerang.”Our results have some implication for further understanding SCS circulation in terms of energy.
作者
杨倩
崔超然
张宇
刘志宇
管玉平
黄瑞新
YANG Qian;CUI Chaoran;ZHANG Yu;LIU Zhiyu;GUAN Yuping;HUANG Ruixin(State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences),Guangzhou 510301, China;CAS Key Laboratory of Ocean Circulation and Waves (Institute of Oceanology, Chinese Academy of Sciences), Qingdao 266071,China;College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;Zhuhai Joint Innovative Center for Climate-Environment-Ecosystem, Zhuhai 519078, China)
出处
《热带海洋学报》
CAS
CSCD
北大核心
2018年第6期41-48,共8页
Journal of Tropical Oceanography
基金
国家自然科学基金项目(41676021、41541040、91228202)
近海海洋环境科学国家重点实验室开放课题(MELRS1608).
关键词
南海
风能
表层流
地转流
South China Sea
wind energy
surface current
geostrophic current, ageostrophic current
