Holocene variability of the Kuroshio Current in the Okinawa Trough, northwestern Pacific Ocean
Holocene variability of the Kuroshio Current in the Okinawa Trough, northwestern Pacific Ocean
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DOI：
10.1016/s0012-821x(00)00321-6
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发表时间：
2000-12-30
影响因子：
5.3
通讯作者：
Cheng, XR
中科院分区：
文献类型：
--
作者：
Jian, ZM;Wang, PX;Cheng, XR
根据详细的AMS C-14测年、稳定同位素和浮游有孔虫分布，对冲绳海槽南部和北部的255和B-3GC岩芯进行了研究，以确定全新世黑潮在百年尺度上的变化。据推测，黑潮的主流会以类似7.3公历(卡)的时间重新进入冲绳海槽。KYR BP导致沉积速率突变，显著增加了黑潮指示物质Pulleniatina obliquiloculata的丰度，增加了海表面温度(SST)和温跃层深度(DOT)。类似于4.6-2.7卡路里。KYR BP期间，P的丰度急剧下降，相应的SST和DOT下降，表明当时黑潮的影响减弱，可能是由于冬季风的加强。值得注意的是，全新世黑潮洋流的周期(如冲绳海槽南部和北部海温的差异)与1500年和700-800年(归因于海洋温盐环流1500年循环的二次谐波)相似。全新世事件(类似于0.6、1.7、3.3、4.6、5.9、8.1、9.4卡)。北大西洋、阿拉伯海海洋沉积岩芯和格陵兰冰芯记录到的千年尺度气候循环的最新表现似乎是冲绳海槽的气候变化(KYR BP)，这表明全球气候遥相关。(C)2000 Elsevier Science B.V.保留所有权利。
Cores 255 and B-3GC from the southern and northern Okinawa Trough, respectively, were studied for determining the variability of the Kuroshio Current on centennial scales during the Holocene based on detailed AMS C-14 dates, stable isotope, and planktonic foraminiferal distribution. The main flow of the Kuroshio Current was inferred to reenter the Okinawa Trough at similar to7.3 calendar (cal.) kyr BP, leading to abrupt changes in sedimentation rate, remarkably increased abundance of the Kuroshio Current indicator Pulleniatina obliquiloculata, increased sea surface temperature (SST) and depth of thermocline (DOT). During similar to4.6-2.7 cal. kyr BP, the abundance of P, obliquiloculata sharply decreased, corresponding to a decreases in SST and DOT, implying that the influence of the Kuroshio Current weakened at that time, possibly as a result of the intensified winter monsoon. Significantly, the Kuroshio Current proxies (e.g. the difference in SST between the southern and northern Okinawa Trough) display periodicities of similar to 1500 yr and similar to 700-800 yr (ascribed to the second harmonic of the 1500 yr cycle in oceanic thermohaline circulation) during the Holocene. The Holocene events (at similar to0.6, 1.7, 3.3, 4.6, 5.9, 8.1, 9.4 cal. kyr BP) in the Okinawa Trough appear to be the most recent manifestation of the millennial scale climate cycle, recorded in the North Atlantic, Arabian Sea marine sediment cores and Greenland ice cores, suggesting global climatic tele-connections. (C) 2000 Elsevier Science B.V. All rights reserved.