Shifts of the Kuroshio axis over the last 20 000 years  

作　　者：Jian Zhimin Y. Saito Wang Pinxian Li Baohua Chen Ronghua 

机构地区：[1]Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China [2]Geol Survey Japan, Marine Geol Dept, Tsukuba, Ibaraki 305, Japan [3]Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Nanjing 210008, Peoples R China [4]State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Peoples R China

出　　处：《Chinese Science Bulletin》1998年第12期1053-1056,共4页

基　　金：theStateEducationCommissionofChinaandtheNationalNaturalScienceFoundationofChina (GrantNo .4940 6 0 6 7)

摘　　要：Core 255 from the southern Okinawa Trough was selected to monitor the shift of the Kuroshio axis over the last 20 000 years. During the last glacial maximum the Kuroshio axis had ever shifted outside the Okinawa Trough. It entered the Okinawa Trough again at about 6 500 a BP, leading to abrupt increase of sedimentation rate, distinctly coarser sediment and remarkably increased abundance of foraminiferal indicators of the Kuroshio in the core. But, during about 4 000-3 000 a BP the abundance of the Kuroshio indicator Pulleniatina obliquiloculata sharply decreased again, indicating that the Kuroshio axis had ever shifted easterly for a short period or the Kuroshio was weakened and that moment.Core 255 from the southern Okinawa Trough was selected to monitor the shift of the Kuroshio axis over the last 20 000 years. During the last glacial maximum the Kuroshio axis had ever shifted outside the Okinawa Trough. It entered the Okinawa Trough again at about 6 500 a BP, leading to abrupt increase of sedimentation rate, distinctly coarser sediment and remarkably increased abundance of foraminiferal indicators of the Kuroshio in the core. But, during about 4 000-3 000 a BP the abundance of the Kuroshio indicatorPulleniatina obliquiloculata sharply decreased again, indicating that the Kuroshio axis had ever shifted casterly for a short period or the Kuroshio was weakened and that moment.

关 键 词：KUROSHIO paleooceanography AMS 14C DATING FORAMINIFERA OKINAWA Trough. 

分 类 号：P736[天文地球—海洋地质]