同化海温观测数据研究波浪破碎对海洋上层结构的影响  

Effect of surface wave breaking on upper-ocean structure revealed by assimilating sea temperature data

作　　者：张学峰[1,2] 韩桂军[2] 吴新荣[2] 李威[2] 王东晓[1] 

机构地区：[1]热带海洋环境国家重点实验室(中国科学院南海海洋研究所),广东广州510301 [2]国家海洋信息中心,天津300717

出　　处：《热带海洋学报》2011年第5期48-54,共7页Journal of Tropical Oceanography

基　　金：国家重点基础研究发展计划项目(2007CB816001);中国科学院重大项目(KZCX1-YW-12-01);国家自然科学基金项目(41030854;40906015;40906016;41106005);卫星海洋动力学国家重点实验室开放基金项目(SODA0703)

摘　　要：首先利用考虑波浪破碎效应的Mellor-Yamada 2.5阶湍流闭合方案,探讨了海表温度(SST)对波能因子α和Charnock数β的敏感性问题。然后采用变分数据同化途径,基于Papa海洋天气站(OWS Papa Station)的上层温度观测数据,对该参数化方案中的波能因子α和Charnock数β两个参数进行了最优估计。最优估计的结果表明,当α约为167、β约为4.1×105时,价值函数达到最小值。利用上述参数的最优估计进行海温的数值模拟,可以较好地反映出海表温度的日变化和月变化过程,模拟的上混合层的温度和深度也与观测较为一致。最后利用以上参数的最优估计结果对湍动能方程进行诊断计算,研究了波浪破碎对海洋上层湍能量收支的影响。Sensitivity of sea surface temperature（SST） to wave energy factor α and Charnock parameter β is discussed using Mellor-Yamada 2.5 turbulence closure model in which wave breaking is considered.The upper-ocean temperature data in summer from OWS Station Papa is assimilated to estimate α and β via a variational approach optimally.It shows that the cost function reaches minimum when α=167 and β=4.1×105.Both monthly and daily SSTs at OWS Station Papa can be success-fully reconstructed with the optimal α and β,and the simulated temperature and depth of surface mixed layer are also consis-tent with the observation.The equation of turbulent kinetic energy is diagnosed utilizing the optimal parameters,from which the effect of wave breaking on the turbulent energy budget is revealed.

关 键 词：海表粗糙度 波能因子 同化 波浪破碎 

分 类 号：P731[天文地球—海洋科学]