东海海域春季温度场空间结构特征分析——三维地统计学方法

Spatial Structure Analyses of the Spring Temperature Field of the East China Sea:a Three-dimensional Geostatistical Approach

在海洋温度场三维空间结构特征研究上,常规的研究方法往往忽视了温度场在空间上的相关性、非周期性和不规则性,而地统计学能够有效地研究自然现象的空间结构特征。本文采用三维地统计学方法研究了东海海域春季温度场的三维空间结构特征,采用三维变异函数定量描述了东海海域春季温度场的连续性和方向性特征。研究的结果表明:东海海域春季温度场在整个研究区内具有明显的漂移;但在变程内具有显著的空间结构性特点,其各个方向上变异函数的理论模型均为具有块金效应的高斯模型。在水平和垂直方向上温度场的空间变异尺度分别为km级和m级,而温度场在水平各个方向上也表现为各项异性,其中NW-SE向的相关性最好,NE-WS向相关性最弱。

The three-dimensional spatial structure features of the spring temperature field of the East China Sea were studied using the geostatistical method. The continuous and directional features were quantitatively described by a three-dimensional variogram. The results show that there is obvious drift of the spring temperature field of the East China Sea in the study area obviously; But all directional variograms have good spatial structures in their range, and all their theoretical models are the Gauss models with nugget effect. The spatial variation scale of the horizontal direction is Km and the vertical direction is m. The anisotropy feature of temperature field is showed on all horizontal directions. It has the best correlations in the direction of NW-SE, and the least in the direction of NE-WS.