在对取自对马暖流影响区的CSH1和黑潮主流轴影响下的DGKS9603孔沉积物中的浮游有孔虫种群以及混合层种Globigerinoides ruber和温跃层种Neogloboquadrina dutertrei的δ18O,δ13C记录的对比分析基础上,探讨了晚第四纪对马暖流的演化和变...在对取自对马暖流影响区的CSH1和黑潮主流轴影响下的DGKS9603孔沉积物中的浮游有孔虫种群以及混合层种Globigerinoides ruber和温跃层种Neogloboquadrina dutertrei的δ18O,δ13C记录的对比分析基础上,探讨了晚第四纪对马暖流的演化和变动.结果表明在40～24cal ka BP的低海平面时期对马暖流消失,然而黑潮仍然存在于冲绳海槽内部,黑潮水体在海槽北部的爬升引起显著的上升流,同时低海平面也使得陆源冲淡水对于海槽北部的影响加强;冲淡水的影响在末次冰期最盛期(LGM)期间达到顶峰,而最低海平面和黑潮的减弱使得LGM期间上升流明显减弱;现代对马暖流的发育始于16cal ka BP左右;冰消期中黑潮对于海槽区影响的加强在中部和北部是同步发生的,伴随其发育过程,黑潮水体逐渐成为对马暖流主要的水体来源;而现代对马暖流的最终形成是在8.5cal ka BP左右,此后这种环流格局相对稳定,从水体组成上而言现代对马暖流水体主要来源于黑潮主干;距今3.0cal ka BP左右,可能是在冬季风强化和黑潮减弱的背景下,对马暖流流径发生了一次偏转,导致冷水团影响加强.展开更多
On the basis of study overview of SU Jilan, YUAN Yaochu and GUAN Bingxian, the recent study advances on the Kuroshio in the East China Sea(ESC) and currents in the region east of Ryukyu Islands are reviewed, especiall...On the basis of study overview of SU Jilan, YUAN Yaochu and GUAN Bingxian, the recent study advances on the Kuroshio in the East China Sea(ESC) and currents in the region east of Ryukyu Islands are reviewed, especially since 2000 years.The most interested problems awaiting solution in the ESC are as follows: the structure variability of the Kuroshio main part, the Kuroshio intrusion northeast of Taiwan and southwest of Kyushu, meso-scale eddies on both sides of Kuroshio and so on. Study of east of Ryukyu Islands is concentrated on the Ryukyu Current, anti-cyclonic warm eddies and cyclonic cold eddies east of the Ryukyu Current. From the above analysis, finally, the author put forward some problems to be further studied.展开更多
The Princeton Ocean model was used to simulate the circulation in the Huanghai Sea and East China Sea and its annual cycle showing that:(1) A weak countercurrent exists on the left side of the Kuroshio.The countercurr...The Princeton Ocean model was used to simulate the circulation in the Huanghai Sea and East China Sea and its annual cycle showing that:(1) A weak countercurrent exists on the left side of the Kuroshio.The countercurrent separates from the main stream of the Kuroshio around 30°N,128°E,flows southwestward along isobaths,meets with the offshore branch of the Taiwan Warm Current around 28°N,124°E,then returns back and joins the main stream,thus forming a cyclonic circulation.(2) The Taiwan Warm Current has an inshore branch and an offshore branch.Only in summer,the inshore branch can reach to about 30°N,where separates into two branches;one flows northward Changjiang River mouth,the other flows eastward,to be one of the sources of the Tsushima Warm Current.(3) The Tsushima Warm Current has multiple-sources.(4) In summer,Huanghai Sea Warm Current does not enter the southern Huanghai Sea.It mainly origins from the middle shelf flow in seasons other than autumn,in summer,it seemingly comes from the extension of the inshore branch of the Taiwan Warm Current.(5) The Eddy in the northern East China Sea exists all year round,with a closing cyclonical circulation in winter and summer.The seasonal variation of the eddy is influenced by the components of the cyclonical circulation,such as the Huanghai Sea Warm Current and middle shelf flow.展开更多
在冲绳海槽北部B-3GC孔高分辨率地层年代框架的基础上,利用多种分子生物标志物和生源组分指标,重建了该地区全新世以来表层海水温度和生产力的变化历史。研究发现,UK3′7—表层海水温度和生产力的变化指示了全新世黑潮及对马暖流分支的...在冲绳海槽北部B-3GC孔高分辨率地层年代框架的基础上,利用多种分子生物标志物和生源组分指标,重建了该地区全新世以来表层海水温度和生产力的变化历史。研究发现,UK3′7—表层海水温度和生产力的变化指示了全新世黑潮及对马暖流分支的变迁。10.6～7.3 ka BP期间,冲绳海槽北部主要受东海陆架冷水团影响,陆源物质输入量增加,初级生产力比较高,表层海水温度较低。7.3～4.6 ka BP期间,黑潮暖流对该区的影响迅速增强,表层海水快速增温,陆源物质输入减少,但是各种生产力指标显示出上升趋势,与该区上升流的出现和迅速发育有关。4.6～2.7 ka BP期间,即全新世普林虫低值事件(PME)期间,表层海水温度明显降低了0.8～1.4℃,陆源物质输入增加,初级生产力和各种生源组分的含量也达到较高水平,说明此时黑潮强度减弱,或者黑潮主流轴向太平洋方向发生偏移,该区再次受到陆架冲淡水的影响。2.7 ka BP以来,虽然黑潮暖流再次影响到该海区,但初级生产力和生源物质输出量继续大幅增高,可能与该地区上升流的持续发育有关。展开更多
A three dimensional baroclinic prognostic model on σ-coordinates was established on the basis of POM to simulate the East China Seas circulation in summer considering the topography, inflow and outflow at the open bo...A three dimensional baroclinic prognostic model on σ-coordinates was established on the basis of POM to simulate the East China Seas circulation in summer considering the topography, inflow and outflow at the open boundary, Changjiang runoff, heat flux and wind stress on the surface. This study showed that ① the Kuroshio flows along the contnental shelf slope of the East China Sea flowing in accordance with the slope topography and some eddies appear on its two sides;②the upper water of the Taiwan Warm Current comes mainly from the Taiwan Strait and that the bottom water comes mostly from Kuroshio sub-surface water flowing on the shelf and passing through the east of Taiwan Island;③ the Tsushima Warm Current in summer comes from multiple sources:the Taiwan Warm Current, one of the branches of the Kuroshio, mixed water of Changjiang Diluted Water with West Korea Coastal Current and Taiwan Warm Current;④ the Changjiang Diluted Water turns northwards rapidly after flowsing out the Changjiang River Mouth, affected by Zhejiang Coast Current, Taiwan Warm Current and southwest monsoon, and flows southeastwards after arriving at around 34°N;⑤ there is a meso-scale anticyclonic eddy in the northeast of the Changjiang River Mouth it was formed by the north branch of the Taiwan Warm Current and there is another cyclonic eddy in southwest of Chejudo Island;⑥ the circulation of the Huanghai Cold Water Mass in summer is divided into north and south parts and their current is strong in the upper layer and weak near the bottom layer;⑦ there is a meso-scale anticyclone eddy near the Qingdao-Shidao coast area.展开更多
文摘在对取自对马暖流影响区的CSH1和黑潮主流轴影响下的DGKS9603孔沉积物中的浮游有孔虫种群以及混合层种Globigerinoides ruber和温跃层种Neogloboquadrina dutertrei的δ18O,δ13C记录的对比分析基础上,探讨了晚第四纪对马暖流的演化和变动.结果表明在40～24cal ka BP的低海平面时期对马暖流消失,然而黑潮仍然存在于冲绳海槽内部,黑潮水体在海槽北部的爬升引起显著的上升流,同时低海平面也使得陆源冲淡水对于海槽北部的影响加强;冲淡水的影响在末次冰期最盛期(LGM)期间达到顶峰,而最低海平面和黑潮的减弱使得LGM期间上升流明显减弱;现代对马暖流的发育始于16cal ka BP左右;冰消期中黑潮对于海槽区影响的加强在中部和北部是同步发生的,伴随其发育过程,黑潮水体逐渐成为对马暖流主要的水体来源;而现代对马暖流的最终形成是在8.5cal ka BP左右,此后这种环流格局相对稳定,从水体组成上而言现代对马暖流水体主要来源于黑潮主干;距今3.0cal ka BP左右,可能是在冬季风强化和黑潮减弱的背景下,对马暖流流径发生了一次偏转,导致冷水团影响加强.
文摘On the basis of study overview of SU Jilan, YUAN Yaochu and GUAN Bingxian, the recent study advances on the Kuroshio in the East China Sea(ESC) and currents in the region east of Ryukyu Islands are reviewed, especially since 2000 years.The most interested problems awaiting solution in the ESC are as follows: the structure variability of the Kuroshio main part, the Kuroshio intrusion northeast of Taiwan and southwest of Kyushu, meso-scale eddies on both sides of Kuroshio and so on. Study of east of Ryukyu Islands is concentrated on the Ryukyu Current, anti-cyclonic warm eddies and cyclonic cold eddies east of the Ryukyu Current. From the above analysis, finally, the author put forward some problems to be further studied.
文摘The Princeton Ocean model was used to simulate the circulation in the Huanghai Sea and East China Sea and its annual cycle showing that:(1) A weak countercurrent exists on the left side of the Kuroshio.The countercurrent separates from the main stream of the Kuroshio around 30°N,128°E,flows southwestward along isobaths,meets with the offshore branch of the Taiwan Warm Current around 28°N,124°E,then returns back and joins the main stream,thus forming a cyclonic circulation.(2) The Taiwan Warm Current has an inshore branch and an offshore branch.Only in summer,the inshore branch can reach to about 30°N,where separates into two branches;one flows northward Changjiang River mouth,the other flows eastward,to be one of the sources of the Tsushima Warm Current.(3) The Tsushima Warm Current has multiple-sources.(4) In summer,Huanghai Sea Warm Current does not enter the southern Huanghai Sea.It mainly origins from the middle shelf flow in seasons other than autumn,in summer,it seemingly comes from the extension of the inshore branch of the Taiwan Warm Current.(5) The Eddy in the northern East China Sea exists all year round,with a closing cyclonical circulation in winter and summer.The seasonal variation of the eddy is influenced by the components of the cyclonical circulation,such as the Huanghai Sea Warm Current and middle shelf flow.
文摘在冲绳海槽北部B-3GC孔高分辨率地层年代框架的基础上,利用多种分子生物标志物和生源组分指标,重建了该地区全新世以来表层海水温度和生产力的变化历史。研究发现,UK3′7—表层海水温度和生产力的变化指示了全新世黑潮及对马暖流分支的变迁。10.6～7.3 ka BP期间,冲绳海槽北部主要受东海陆架冷水团影响,陆源物质输入量增加,初级生产力比较高,表层海水温度较低。7.3～4.6 ka BP期间,黑潮暖流对该区的影响迅速增强,表层海水快速增温,陆源物质输入减少,但是各种生产力指标显示出上升趋势,与该区上升流的出现和迅速发育有关。4.6～2.7 ka BP期间,即全新世普林虫低值事件(PME)期间,表层海水温度明显降低了0.8～1.4℃,陆源物质输入增加,初级生产力和各种生源组分的含量也达到较高水平,说明此时黑潮强度减弱,或者黑潮主流轴向太平洋方向发生偏移,该区再次受到陆架冲淡水的影响。2.7 ka BP以来,虽然黑潮暖流再次影响到该海区,但初级生产力和生源物质输出量继续大幅增高,可能与该地区上升流的持续发育有关。
文摘A three dimensional baroclinic prognostic model on σ-coordinates was established on the basis of POM to simulate the East China Seas circulation in summer considering the topography, inflow and outflow at the open boundary, Changjiang runoff, heat flux and wind stress on the surface. This study showed that ① the Kuroshio flows along the contnental shelf slope of the East China Sea flowing in accordance with the slope topography and some eddies appear on its two sides;②the upper water of the Taiwan Warm Current comes mainly from the Taiwan Strait and that the bottom water comes mostly from Kuroshio sub-surface water flowing on the shelf and passing through the east of Taiwan Island;③ the Tsushima Warm Current in summer comes from multiple sources:the Taiwan Warm Current, one of the branches of the Kuroshio, mixed water of Changjiang Diluted Water with West Korea Coastal Current and Taiwan Warm Current;④ the Changjiang Diluted Water turns northwards rapidly after flowsing out the Changjiang River Mouth, affected by Zhejiang Coast Current, Taiwan Warm Current and southwest monsoon, and flows southeastwards after arriving at around 34°N;⑤ there is a meso-scale anticyclonic eddy in the northeast of the Changjiang River Mouth it was formed by the north branch of the Taiwan Warm Current and there is another cyclonic eddy in southwest of Chejudo Island;⑥ the circulation of the Huanghai Cold Water Mass in summer is divided into north and south parts and their current is strong in the upper layer and weak near the bottom layer;⑦ there is a meso-scale anticyclone eddy near the Qingdao-Shidao coast area.
