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末次冰消期以来东黄海暖流系统的演化

, PP. 945-954

Keywords: 末次冰消期,全新世,东黄海,暖流系统

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Abstract:

以黑潮为主干的东黄海暖流系统,所携带的高温高盐水对我国近海的海洋环境和大气环流格局产生了重大影响。为系统重建由黑潮暖流、对马暖流和黄海暖流组成的东黄海暖流系统在末次冰消期以来的演化过程,建立末次冰消期以来东黄海暖流系统的演化模式,对取自黑潮主流轴附近的DGKS9603孔、现代对马暖流边缘的CSH1孔和与黄海暖流相伴生的冷水体下面的泥质沉积区YSDP102孔的古海洋记录进行综合分析研究。结果表明,现代东黄海暖流系统是伴随着末次冰消期以来黑潮的演化和海平面的脉冲式上升而形成与演化的,地理边界条件是非常重要的控制因素。16kaB.P.黑潮对冲绳海槽的影响开始加强,之后随着海平面的上升,对马暖流开始发育,到8.5kaB.P.左右,现代对马暖流正式形成,期间黑潮暖流经历了Heinrich1和YoungerDryas事件的两次减弱过程。76kaB.P.是黑潮暖流和对马暖流末次冰消期以来最强盛的时期;约6.4kaB.P.左右黄海暖流开始出现,至此东黄海暖流系统的基本格局已完全形成;在5.32.8kaB.P.期间,冲绳海槽发生了以"Pulleniatina低值事件"为标志的黑潮变弱过程,导致对马暖流主流轴在3kaB.P.左右发生了一次向太平洋方向的偏转事件,低温、高营养物质含量的陆架冷水团对冲绳海槽北部影响加强,期间在黄海暖流附近冷水体下面堆积了巨厚的泥质沉积体系。此后,由黑潮暖流、对马暖流和黄海暖流组成的东黄海暖流系统显著加强,直至达到现代的态势。

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