The Dansgaard‐Oeschger cycles discovered in the up stream source region of the North Pacific Intermediate Water formation
The Dansgaard‐Oeschger cycles discovered in the up stream source region of the North Pacific Intermediate Water formation
复制标题
DOI：
10.1029/2004gl022260
复制
发表时间：
2005-06
影响因子：
5.2
通讯作者：
A. Ono;Kozo Takahashi;K. Katsuki;Y. Okazaki;T. Sakamoto
中科院分区：
文献类型：
--
作者：
A. Ono;Kozo Takahashi;K. Katsuki;Y. Okazaki;T. Sakamoto
基于对总有机碳（TOC）、C/N比和生物蛋白石的高分辨率测量，利用底龄为115 ka的岩芯MD 01 - 2412（53 m），在鄂霍次克海南部确定了千年尺度的海洋学振荡。这些振荡与Dansgaard‐Oeschger（D‐O）气候周期有关。迄今为止，北太平洋中层水（NPIW）形成的源区数据不足。我们报告了NPIW上游源区D-O循环的第一个决定性文件，说明了在下游区域观察到的D-O循环（例如，圣巴巴拉盆地）由于NPIW的扩张，在一定程度上受到鄂霍次克海气候变化的影响。TOC和C/N比值的增加反映了与过去115 kyrs的14个海平面间事件相关的海平面突然上升，这归因于侵蚀大陆架沉积物的向下迁移。
Millennial‐scale oceanographic oscillations were identified in the southern Okhotsk Sea based on high‐resolution measurements of total organic carbon (TOC), C/N ratios, and biogenic opal, employing Core MD01‐2412 (53 m) with the bottom age of 115 ka. The oscillations are linked with the Dansgaard‐Oeschger (D‐O) climatic cycles. Inadequate data existed in the source regions of the North Pacific Intermediate Water (NPIW) formation thus far. We report the first decisive documentation of the D‐O cycles in the up stream source region of the NPIW, illustrating that the D‐O cycles observed in the down stream regions (e.g., Santa Barbara Basin) due to expansion of the NPIW were in part governed by the climatic variations occurred in the Okhotsk Sea. Increases in TOC and C/N ratios reflect abrupt sea level rises associated with 14 interstadial events over the past 115 kyrs, attributing to the downward transport of eroded continental shelf sediments.