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基于高分辨率风场的海洋近惯性能通量计算——时空特征及其影响因素
杨兵, 侯一筠
中国科学院海洋研究所
摘要:
基于高分辨率CFSR风场资料、气候态海洋混合层厚度资料和卫星高度计海面高度异常资料,本文估计了大气风场向全球海洋混合层的近惯性能通量和近惯性能量输入功率,并探究了混合层厚度、风场时间分辨率、经验衰减系数和中尺度涡旋涡度对近惯性能通量和能量输入功率的影响。浮标实测风场和流速表明,本文所用的风场和阻尼平板模型可用于估计风场向全球海洋的近惯性能通量。本文计算得到的大气向全球海洋输入近惯性能量的功率为0.56 TW,其中北半球贡献0.22 TW,南半球贡献0.34 TW。在时间上,风场的近惯性能通量呈现各个半球冬季最强、夏季最弱的特征,这和西风带风场的季节变化有关。在空间上,近惯性能通量的高值海域为南、北半球西风带海洋,尤其是南大洋。混合层厚度和风场空间不均匀性使得西风带近惯性能通量呈现纬向变化,即海盆西部强于海盆东部。风场时间分辨率对近惯性能通量的估计至关重要,低时间分辨率风场对近惯性能通量的低估达到13%-30%。阻尼平板模型中的经验衰减系数对近惯性能通量估计的影响不超过5%。中尺度涡旋涡度仅改变近惯性能通量的空间分布,而对全球近惯性能量输入功率的影响可以忽略。
关键词:  近惯性能通量  CFSR风场  阻尼平板模型  混合层厚度  经验衰减系数  中尺度涡旋
DOI:10.11693/hyhz20200100018
分类号:
基金项目:国家自然科学基金青年科学基金项目, 41706017号。杨兵, 博士研究生, E-mail yangbing@qdio.ac.cn①通讯作者侯一筠, 博士生导师, 研究员, E-mail yjhou@qdio.ac.cn收稿日期: , 收修改稿日期,
WIND-GENERATED NEAR-INERTIAL ENERGY FLUX TO THE OCEANS——THE SPATIAL-TEMPORAL VARIATIONS AND IMPACT FACTORS
Yang Bing, Hou Yijun
Institute of Oceanology, Chinese Academy of Sciences
Abstract:
Based on high resolution CFSR reanalysis wind, climatological ocean mixed layer depth and remote sensing sea level anomaly data, the wind-generated near-inertial energy flux to oceans is estimated using the damped slab model. The spatial and temporal characteristics of the energy flux are shown, and the roles of the mixed layer depth, empirical damping coefficient, and mesoscale eddy vorticity and wind data resolution are examined. Based on wind and currents observed by buoy, the CFSR wind and the slab model are confirmed to be competent to estimate near-inertial energy flux from wind to ocean. The global wind-generated near-inertial energy input power is 0.56 TW, and the Northern and Southern Hemisphere contribute 0.22 and 0.34 TW, respectively. The global mean near-inertial energy flux is 1.94 mW/m2, with the Northern and Southern Hemisphere contribute 2.02 mW/m2 and 1.90 mW/m2, respectively. The energy flux reach maximum (minimum) in winter (summer) of each hemisphere which is related to seasonal variation of wind. The maximum near-inertial energy flux appears in the mid-latitude westerly belt, especially the Southern Ocean. The spatial inhomogeneity of mixed layer depth and wind lead to zonal variation of near-inertial energy flux, i.e., energy flux of western sea basin is stronger than that of the eastern sea basin. The temporal resolution of wind is vital to energy flux estimation, and low temporal resolution wind can induce underestimate of energy flux as much as 13% to 30%. The empirical damping coefficient of the slab model can only cause energy flux change of less than 5%. The vorticity of mesoscale eddy only result in local spatial distribution of energy flux and do not influence the global power input.
Key words:  near-inertial energy flux  CFSR wind  slab model  mixed layer depth  empirical damping coefficient  mesoscale eddy
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