对北赤道流分叉纬度变化规律的研究分析  

The determination about The bifurcation latitude of the NEC and its variations

作　　者：张绪东[1] 修义瑞[1] 刘金芳[1] 苏戈[1] 王庆业[2] 

机构地区：[1]海军海洋水文气象中心,北京100161 [2]广东海洋大学南海海洋环境研究所,湛江524088

出　　处：《海洋预报》2008年第2期33-41,共9页Marine Forecasts

摘　　要：关于北赤道流分叉研究的两类方法,即水文实测数据分析和数值模拟,其本身都因存在突出的问题而引起估算结果的偏差,致使相互结果差别很大。所以,如何找到一种高时空分辨率的数据或提出一个比较符合物理实际并得到实测数据验证的数值模式是研究赤道流分叉的关键。本文将利用从1992年10月到2004年12月高时空分辨率(时间分辨率:7 d;空间分辨率:1/3°×1/3°)的卫星高度计数据,对北赤道流在表层的分叉进行研究,包括确定分叉点,求得其季节和年际变化的规律。There are two kinds of studies on the bifurcation of the NEC, one based on observed hydrographical data and the other based on numerical modelling. The results derived from observational data, are more consistent with facts with significant errors owing to poor resolution of the data used. The results from numerical models have higher temporal and spatial resolution, while they deviate from observations due to certain defects of the models themselves. Up to now, these model results about bifurcation of the NEC, such as variation of bifurcation latitude, have great differences from each other. So it is the key to study bifurcation of the NEC how to find a data set with high enough resolution or to come up with a numerical model, which is based on real physical processes and can be validated by observations. In this thesis, altimetry data with high resolution （time resolution： 7 days; space resolution： 1/3°×1/3° latitude and 1 ongitude as statistical grids） from October 1992 through December 2004 are analyzed to determine the bifurcation latitude according Lagrangian trajectory method, and study its seasonal and interannual variations.

关 键 词：北赤道流分叉 北赤道流分叉轨迹 卫星高度计 

分 类 号：P731[天文地球—海洋科学]