基于SODA3资料的西北太平洋海气边界层主要特征及相关性分析

摘要

By using monthly and 5d data of SODA3.3.1 from 2011 to 2015,we analysis the characteristics of SST (sea surface temperature) and sub-surface temperature,MLD (mixed layer depth),wind stress and wind stress vorticity in the Westem Pacific,and the relationships between them are discussed with correlation method.The results show that there is a cold center near the equator;MLD decreases from south to north,and there are two maximum centers near the Kuroshio extension.Wind stress direction is north in winter and autumn with a higher value,while wind stress direction is west in spring and south in summer.SST has a negative correlation with MLD in most areas and shows a downward trends near equator.This trend is more obvious in La Nina years and not obvious in E1 Nino year.Sub surface temperature has a positive correlation with MLD to the north of 15°N and negatively correlated with MLD in the Kuroshio area.SST has a positive correlation with wind stress vorticity to the north of 15°N.The correlation index is high during Jan.to Mar.and Jul.to Oct.,and the correlation between sub-surface temperature and wind stess vortisity is irregular.%基于SODA3.3.1海洋数据集2011-2015年逐月和逐5d平均资料,对西北太平洋海域表层和次表层海温、混合层深度、风应力及风应力旋度的分布特征进行了分析,使用相关系数和相关矩方法分析了海温与混合层深度、风应力旋度的相关关系及变化特征.结果表明:西北太平洋次表层海温在赤道附近存在冷中心;混合层深度呈北高南低分布,在黑潮延伸体以南有两个极大值中心;风应力秋冬季方向偏北且取值较大(冬季为全年最大),春季方向偏西,夏季方向偏南,两季风应力较小,西北太平洋表层海温与混合层深度在大部海域呈负相关,冬夏两季相关系数较高,在赤道附近相关系数下降,厄尔尼诺年下降趋势小,拉尼娜年下降趋势大,次表层海温与混合层深度大部呈正相关,黑潮流域呈负相关,相关区域主要位于150N以北.表层海温与风应力旋度相关区域主要位于150N以北,呈正相关,1-3月份和7-10月份相关性较高,次表层海温与风应力旋度相关区域分布零散无规律.