...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Millenial scale variations of the isotopic composition of atmospheric oxygen over Marine Isotopic Stage 4
【24h】

Millenial scale variations of the isotopic composition of atmospheric oxygen over Marine Isotopic Stage 4

机译：海洋同位素第4阶段大气氧同位素组成的千禧尺度变化

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

During rapid events of the last glacial period (DO events), dramatic changes are recorded at high and low latitudes. Without a precise common timescale, links between changes in Greenland temperature and changes in biosphere productivity, hydrology regimes and sea level are difficult to establish. The composition of atmospheric oxygen (delta O-18(atm)) is influenced by global sea level changes, the global hydrologic cycle and the biosphere productivity. Since delta O-18(atm) is measured in ice cores it gives the opportunity to investigate the underlying processes with no timescale uncertainty. Here, we present the first high resolution (50 yrs) record of the isotopic composition of atmospheric oxygen (delta O-19(atm)) measured in the air trapped in a Greenland ice core (NorthGRIP). Our record covers a sequence of DO events (18-19-20) corresponding to the Marine Isotopic Stage 4, similar to 75 to 60 ka ago. Our measurements reveal rapid changes of delta O-18(atm) associated with the DO events. With a few additional measurements of the third isotope of oxygen (O-17) during the DO event 19, we exclude the hypothesis that sea level changes are responsible for the isotopic variations. They originate more likely from large changes in relative humidity and latitudinal repartition of the continental vegetation over the DO events. (C) 2007 Elsevier B.V. All rights reserved.
机译：在上一个冰川期的快速事件（DO事件）中，在高纬度和低纬度处都记录了剧烈的变化。没有精确的共同时间尺度，就很难建立格陵兰岛温度变化与生物圈生产力变化，水文状况和海平面之间的联系。大气氧的组成（δO-18（atm））受全球海平面变化，全球水文循环和生物圈生产力的影响。由于三角洲O-18（atm）是在冰芯中测量的，因此可以在没有时间范围不确定性的情况下研究潜在的过程。在这里，我们提出了在格陵兰岛冰芯（NorthGRIP）中捕获的空气中测得的大气氧同位素组成（δO-19（atm））的第一个高分辨率（50年）记录。我们的记录涵盖了与海洋同位素阶段4相对应的一系列DO事件（18-19-20），类似于75至60 ka以前。我们的测量揭示了与DO事件相关的δO-18（atm）的快速变化。在DO事件19期间，通过对氧的第三同位素（O-17）进行的其他一些测量，我们排除了海平面变化是造成同位素变化的假说。它们更有可能来自DO事件期间大陆植被的相对湿度和纬度再分配的大变化。 （C）2007 Elsevier B.V.保留所有权利。

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