黑潮末端与黑潮延伸体的流场异常模态分析

发布时间：2018-01-14 02:12

  本文关键词：黑潮末端与黑潮延伸体的流场异常模态分析　出处：《海洋科学进展》2016年01期 　论文类型：期刊论文

  更多相关文章： 流场异常 黑潮末端 黑潮延伸体 复EOF分析

【摘要】：对北太平洋黑潮末端及黑潮延伸体的流场异常采用复EOF分析,结果发现:该海域流场明显异常在全年四季都主要发生在黑潮末端和黑潮延伸体上,其异常的主要形式在前2个模态均表现为一条由中尺度涡旋组成的涡旋带,带上通常有两两旋转方向相反的涡旋偶。各季第一模态方差贡献表现的季节变化特征与日本以南的黑潮流量相一致,秋季最大,夏季次之。ENSO的机制是副热带太平洋经圈环流与热带太平洋纬向环流系统之间的相互作用,其在各季第一模态的年际变化上均有所反映。冬季PDO在年代际变化上表现明显,其他三季则NPGO表现明显。该海域流场异常的性质是海洋Rossby波的异常,而赤道太平洋流场异常的性质是赤道俘获波的异常,但两者均与风应力异常强迫有关。
[Abstract]:At the end of the North Pacific Kuroshio and the Kuroshio extension flow anomaly using complex EOF analysis, the results show that the waters flow significantly abnormal in four seasons have occurred mainly in the Kuroshio and the Kuroshio extension end, the main form of the anomalies in the first 2 modes showed a vortex composed of mesoscale vortex zone. Usually there are 22 pairs of vortices with opposite rotating direction. The seasonal variation of each season the first mode performance variance contribution with Japan at the south of the Kuroshio transport is consistent, the biggest fall in summer, the mechanism of.ENSO is subtropical Pacific meridional circulation and zonal circulation in the tropical Pacific Ocean Interaction between systems, in its annual the first mode of the season changes are reflected in the winter. The PDO decadal variation is obvious, the other three quarter NPGO performance significantly. The nature of the sea flow anomaly is the different oceanic Rossby wave Often, the anomalous flow field in the equatorial Pacific is the anomaly of the equatorial capture wave, but both are related to the abnormal forcing of the wind stress.

【作者单位】： 中国人民解放军61741部队;解放军理工大学气象海洋学院大气环流与短期气候预测实验室;北京市计量检测科学研究院;
【基金】：国家重点基础研究发展计划项目——西北太平洋海洋多尺度变化过程、机理及可预报性(2013CB956203)
【分类号】：P731.27
【正文快照】： 3.北京市计量检测科学研究院,北京100029)黑潮是位于北太平洋西侧的一支西边界流,具有高温、高盐、流幅窄、流速快、流量大等特征。日本列岛以南的黑潮通常称之为黑潮末端。黑潮延伸体是指太平洋西边界流在140°E,35°N附近与日本海岸分离后进入北太平洋的水体,其呈现2个大弯，

本文编号：1421560