...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Plio-Pleistocene Hemispheric (A)Symmetries in the Northern and Southern Hemisphere Midlatitudes
【24h】

Plio-Pleistocene Hemispheric (A)Symmetries in the Northern and Southern Hemisphere Midlatitudes

机译：北部和南半球中颌面的Plio-pleistocene hemispheric（a）对称

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

The transition from the warm, stable climate of the Pliocene to the progressively colder glaciations of the Pleistocene, as well as the climate system's evolving response to stationary orbital forcing over the Pleistocene, beg important questions about fundamental climate processes relevant to understanding the impacts of modern anthropogenic forcing of the Earth's energy budget. Here, we gain insight into the evolution of Plio-Pleistocene climate by generating an alkenone-derived, orbitally resolved sea surface temperature (SST) record from Ocean Drilling Program Site 1125 in the southwest Pacific. We compare our data set to midlatitude and equatorial SST records and to the benthic ?~(18)O signal in order to evaluate similarities and differences in climate response between the hemispheres and across latitudes over the Plio-Pleistocene. Secular trends indicate first-order symmetry between the Northern and Southern Hemispheres in the magnitude of mean, glacial, and interglacial cooling. However, the tight coupling that is observed on both secular and orbital timescales between Northern Hemisphere, high latitude, and tropical upwelling climate throughout the last 4 Ma does not extend to Southern Hemisphere climate records as Northern Hemisphere glaciation intensifies in the late Pliocene. The 41-kyr signal remains weak at Site 1125 across the late Pliocene transition but strengthens in conjunction with a major increase in global climate system sensitivity to obliquity forcing beginning around 1.8 Ma. Our analysis points to regionally varied responses across the late Pliocene transition and the emergence of a global feedback mechanism and strengthened obliquity-band climate sensitivity just prior to the mid-Pleistocene transition.
机译：从上新世温暖稳定的气候过渡到更新世逐渐变冷的冰川，以及气候系统在更新世对静止轨道强迫的不断变化的响应，对于理解现代人为强迫对地球能量收支的影响，提出了与基本气候过程相关的重要问题。在这里，我们通过从西南太平洋的海洋钻探项目1125号地点生成一个由烯酮衍生的、轨道解析的海面温度（SST）记录，来深入了解上新世-更新世气候的演变。我们将我们的数据集与中纬度和赤道SST记录以及海底SST记录进行比较~（18） O信号，以评估上更新世期间半球之间和跨纬度气候响应的相似性和差异。长期趋势表明，南北半球在平均冷却、冰川冷却和间冰期冷却的量级上具有一级对称性。然而，随着北半球冰川作用在上新世晚期加剧，在过去4 Ma期间，在北半球、高纬度和热带上升流气候之间的长期和轨道时间尺度上观察到的紧密耦合并没有延伸到南半球气候记录。41 kyr信号在上新世晚期过渡期的1125处仍然微弱，但随着全球气候系统对倾角强迫的敏感性从1.8 Ma左右开始显著增加，信号增强。我们的分析指出，整个上新世晚期过渡期的区域响应不同，在中更新世过渡期之前，全球反馈机制的出现和倾斜带气候敏感性的增强。

著录项

  • 来源
    《Paleoceanography》 |2020年第3期|共17页
  • 作者

    L. C. Peterson; K. T. Lawrence; T.D. Herbert; R. Caballero-Gill; J. Wilson; K. Huska; H. Miller; C. Kelly; J. Seidenstein; D. Hovey; L. Holte;

  • 作者单位

    Environmental Studies Program Luther College Decorah IA USA;

    Geology and Environmental Geosciences Department Lafayette College Easton PA USA;

    Department of Earth Environmental and Planetary Sciences Brown University Providence RI USA;

    Department of Earth Environmental and Planetary Sciences Brown University Providence RI USA;

    Environmental Studies Program Luther College Decorah IA USA;

    Environmental Studies Program Luther College Decorah IA USA;

    Geology and Environmental Geosciences Department Lafayette College Easton PA USA;

    Geology and Environmental Geosciences Department Lafayette College Easton PA USA;

    Geology and Environmental Geosciences Department Lafayette College Easton PA USA;

    Environmental Studies Program Luther College Decorah IA USA;

    Environmental Studies Program Luther College Decorah IA USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    stable; Pliocene to; Pleistocene;

    机译：稳定;专利至;全新世;

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