• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Marine Isotope Stage 11 in the Southern Ocean
【24h】

Marine Isotope Stage 11 in the Southern Ocean

机译：海洋同位素第11阶段南海

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This work provides new insights into the late Pleistocene interglacial Marine Isotope Stage 11 (MIS 11) in the Pacific sector of the Southern Ocean. MIS 11,between ca. 424 and 374 kyr, is a unique, exceptionally long interglacial period that often is regarded as an analogue for what the Holocene would be without any anthropogenic interference. Thick white sedimentary layers with high carbonate content were observed at high southern latitudes during this time interval. We generated a multi-parameter record of coccolithophore data on MIS 11 sediments from core PS75/059-2, which was retrieved west of the East Pacific Rise crest at 54°12.90'S and 125°25.53'W (3613 m water depth) during R/N Polarstern ANT XXVI/2 expedition in the polar South Pacific. In order to characterize the coccolithophore paleoproductivity during MIS 11, two independent proxies were chosen: the number of coccoliths per gram of sediment and the coccolith Sr/ Ca ratio measured in the <20μm coccolith size fraction. Coccolithophore assemblage counts that were performed under a scanning electron microscope indicated that in the fine coccolith fraction almost all the carbonate came from Gephyrocapsa caribbeanica. Coccolith Sr/Ca results vary from 1.58 to 2.47 mmol/mol during the interval selected for this study, which extends from MIS 12 to the onset of MIS 10 (i.e.,~469.3 to ~364.7 kyr). The number of coccoliths per gram of sediment and the Sr/Ca ratio show a steep increase in productivity during MIS 11, with values always above 2.12 mmol/mol. This pattern remains the same even after applying a correction for the temperature effect. All the information retrieved, together with the ongoing research, allows us to determine whether the coccolithophores modified the equilibrium of the inorganic carbon system during MIS 11 in the Pacific sector of the Southern Ocean.
机译：这项工作为南海太平洋地区的晚熟中间海洋同位素第11期（MIS 11）提供了新的洞察。 MIS 11，在CA之间。 424和374 kyr，是一种独特的特别长的横向时期，通常被认为是全新世的没有任何人为干扰的类似物。在此时间间隔期间，在高南部纬度地区观察到具有高碳酸盐含量的厚白色沉积层。我们在核心PS75 / 059-2的MIS 11沉积物上产生了多参数记录，从核心PS75 / 059-2，东太平洋上升嵴以54°12.90和125°25.53'（3613米深）在极南太平洋的R / N偏光蚂蚁XXVI / 2探险期间。为了在MIS 11期间表征Coccolthophore古文本化，选择了两个独立的代理：每克沉积物的Coccoliths的数量和在<20μmcoccolith尺寸分数中测量的Coccolith Sr / Ca比。在扫描电子显微镜下进行的COCCOLETHOPHORE组合计数表明，在精细的COCCOLITH部分中几乎所有碳酸盐来自Gephyrocapsa Caribbeanica。 COCColith SR / CA的结果在选择本研究的间隔期间从1.58到2.47 mmol / mol变化，从MIS 12延伸到MIS 10的发作（即，〜469.3至约364.7kyr）。每克沉积物和Sr / Ca比的Coccoliths的数量显示在MIS 11期间生产率的陡峭增加，始终高于2.12mmol / mol的值。即使在对温度效应施加校正之后，该图案也保持不变。检索的所有信息与正在进行的研究一起允许我们确定CoccolithoChores是否在南海太平洋地区的MIS 11期间修改了无机碳系统的平衡。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号