基于Argo资料的梯度依赖相关尺度方法  

Gradient-dependent correlation scale method based on Argo

作　　者：张春玲 许建平[2,3,4] 鲍献文[4] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]国家海洋局第二海洋研究所,浙江杭州310012 [3]国家海洋局卫星海洋环境动力学国家重点实验室,浙江杭州310012 [4]中国海洋大学海洋环境学院,山东青岛266003

出　　处：《解放军理工大学学报（自然科学版）》2015年第5期476-483,共8页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：科技部科技基础性工作专项基金资助项目(2012FY112300);国家海洋局海洋公益性行业科研专项基金资助项目(2013418032)

摘　　要：为了提升对海洋实测资料的标准化处理水平,基于Argo资料最优插值客观分析实验,对目前被广泛应用的背景误差协方差矩阵经验公式进行了改进,设计了一种提高海洋资料分析精度的方法,简称梯度依赖相关尺度法。利用高斯脉冲和空间能量谱分析方法,在理论上验证了梯度依赖相关尺度法对Argo客观分析精度改进的有效性。通过太平洋海域Argo温、盐度资料客观分析表明,利用海洋水文要素梯度变化对相关尺度进行自动调整可以提高分析方案的适应能力,得到的分析结果更接近海洋客观情况。该方法适用于数据同化或客观分析,同时,在不增加计算量的前提下,可以达到与提高网格密度相同的分析效果,从而更易于进行海洋资料标准化。To promote marine data processing of standardization level,the optimal interpolation objective analysis of the Argo data was conducted,and improvements were made to the empirical formula of a background error covariance matrix widely used in data assimilation and objective analysis systems.Specifically,an estimation of the correlation scales that can improve effectively the accuracy of Argo objective analysis was developed.This method can automatically adapt to the gradient change of a variable and is referred to as＂gradient-dependent correlation scale method＂.Its effect on the Argo objective analysis was verified theoretically with Gaussian pulse and spectrum analysis.The results of the objective analysis of the temperature and salinity data in Pacific Ocean show that the gradient-dependent correlation scales can improve the adaptability of the objective analysis system,making it possible for the analysis scheme to fully absorb the shortwave information of observation in areas with larger oceanographic gradients.This scales can be used for any assimilation methods.This scheme has the same effect in improving the grid density,and is more suitable for standardizing the ocean observations.

关 键 词：ARGO 梯度依赖 背景误差 相关尺度 

分 类 号：P731.1[天文地球—海洋科学]