【摘要】 利用黑潮延伸体海域海平面异常(SLA)数据和SODA海流资料,分析海平面和海流的年际变化特征,以及两者之间的关系。分析发现黑潮延伸体SLA的第二模态是黑潮大弯曲模态,存在29个月的准两年显著振荡。该海域海平面具有显著的年际变化,且与ENSO和PDO密切相关,2002-2004年的黑潮大弯曲期间,海平面与Nino3指数的相关系数为0.74。海平面年际变化和海流关系密切,黑潮延伸体主轴两侧海平面具有显著的季节和年际变化,急流呈大弯曲路径(1993-1996、2002-2004)时,流轴稳定流速大,流轴影响深,急流主轴南侧海平面较高,达到年际变化的最大值,主轴两侧海面高度梯度大。非弯曲期间,急流主轴南压,海流强度减弱,此期间海平面低,主轴两侧海面高度梯度较小。黑潮延伸体上游区海平面变化受黑潮大弯曲影响更为显著。上下游区的海平面和比容海平面的年际变化较为相似,黑潮延伸体海域海流和比容效应共同调控该区域海平面变化。更多还原

【Abstract】 Sea level variation and its relationship with the Kuroshio current were analyzed by of using the AVISO altimeter data and SODA current data, in representative regional area, Kuroshio Extension(KE). The second Empirical Orthogonal Functions( EOF) of the sea level variation in the KE area represented a Kuroshio meander mode with a quasi-biannual period of 29 months. The inter-annual sea level variation related to the El Ni觡o and Kuroshio current closely. The correlation coefficient between inter-annual sea level variation and El Ni觡o was 0.74 during years of 2002-2004 when Kuroshi current was in well-advanced meander. In well-advanced meander years(1993-1996 、 2002-2004), sea level was higher in the south of KE path, and sea level difference between the two sides of KE jet was larger. During no-meander periods, sea level was lower and sea level difference on both sides of jet was small. Sea level variation of up-stream area was affected more significantly by Kuroshio meander than that of down-stream area. Inter-annual variation of the T/P sea level and steric sea level varied similarly in the up and down-stream areas. The Kuroshio extension sea currents and steric effect controlled the regional sea level changes.更多还原