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A spectral mixture model analysis of the Kuroshio variability and the water exchange between the Kuroshio and the East China Sea 总被引：1，自引：0，他引：1
For understanding more about the water exchange between the Kuroshio and the East China Sea,We studied the variability of the Kuroshio in the East China Sea(ECS) in the period of 1991 to 2008 using a three-dimensional circulation model,and calculated Kuroshio onshore volume transport in the ECS at the minimum of 0.48 Sv(1 Sv ;106 m3/s) in summer and the maximum of 1.69 Sv in winter.Based on the data of WOA05 and NCEP,The modeled result indicates that the Kuroshio transport east of Taiwan Island decreased since 2000.Lateral movements tended to be stronger at two ends of the Kuroshio in the ECS than that of the middle segment.In addition,we applied a spectral mixture model(SMM) to determine the exchange zone between the Kuroshio and the shelf water of the ECS.The result reveals a significantly negative correlation(coefficient of-0.78) between the area of exchange zone and the Kuroshio onshore transport at 200 m isobath in the ECS.This conclusion brings a new view for the water exchange between the Kuroshio and the East China Sea.Additional to annual and semi-annual signals,intra-seasonal signal of probably the Pacific origin may trigger the events of Kuroshio intrusion and exchange in the ECS. 相似文献
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The numerical study of the geostrophic and friclional adjustment of the effluent flow of the Huanghe River is reported in this paper. The depth profiles of the cross sections near the estuary were obtained from data compiled by the Committee on the Conservancy of the Huanghe River. It was found that the depth profile fitted a logarithmic curve very well. The governing equation of the geostrophic and frictional adjustment waa obtained from the .quasigeostrophic potential vorticity equation with friction and topography terms.. The governing equation waa solved numerically by Liebmann's iterative method by applying appropriate boundary conditions. The calculated flow pattern agreed with the observations. 相似文献
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本文给出了一个河口、三角洲环流模式,注意力集中在盐水楔型河口的情形。由于我们把江河的出流看作为一个表面漂浮射流,因而可以寻求相似解。在给出了淡水(或半咸水)与海水之间分界面上的摩擦切应力的估计之后,通过求解给出的控制方程组得到了出流河水的扩展以及淡水(或半咸水)内的速度场,比较表明所得到的解跟已知的理论分析与实验观测结果很一致。 相似文献
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本文给出了一个河口、三角洲环流模式，注意力集中在盐水楔型河口的情形。由于我们把江河的出流看作为一个表面漂浮射流，因而可以寻求相似解。在给出了淡水(或半咸水)与海水之间分界面上的摩擦切应力的估计之后，通过求解给出的控制方程组得到了出流河水的扩展以及淡水(或半咸水内的速度场，比较表明所得到的解跟已知的理论分析与实验观测结果很一致。 相似文献
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浮游植物是海洋生态系统食物链的基础组成, 并通过光合作用影响着海表二氧化碳通量变化。文章基于高叶绿素a浓度水域面积指标构建南海浮游植物生物量的估算体系。利用遥感数据, 采用经验正交函数分解插值方法, 重构长时间序列的南海叶绿素a浓度场, 并研究了南海高叶绿素a浓度水域面积特征的时空分布。结果发现: 高叶绿素a浓度水域面积变化有着显著季节特征, 在冬季面积达到最大值, 在夏季达到最小值, 但是该水域对应的叶绿素a浓度却在冬季达到最小值, 在夏季达到最大值, 这一特征可能是由于风驱动的海表动力过程使得海表叶绿素重新分布; 空间分布上, 高叶绿素a浓度水域常年存在于海岸附近, 特别是在中国沿海、越南沿岸、泰国湾以及婆罗洲岛附近。在巽他陆架与湄公河口东部中央海盆, 高叶绿素a浓度区域面积呈年际变化。受厄尔尼诺调控的南海季风, 导致不同年份湄公河口东南沿海存在不同程度的北部冷水侵入, 北部冷水入侵可能是引起局地浮游植物生物量增减的原因。 相似文献
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