...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Single Tests of Thermocline Dwelling Foraminifera Globorotalia inflata as Recorder of Upper Water Column Structure off Mauritania (NW Africa): Methodology and Paleoceanographic Use
【24h】

Single Tests of Thermocline Dwelling Foraminifera Globorotalia inflata as Recorder of Upper Water Column Structure off Mauritania (NW Africa): Methodology and Paleoceanographic Use

机译：ThermoCly住宅Floborotalia的单一测试作为毛里塔尼亚（NW Africa）的上水柱结构的录像机：方法论和古食用

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

Thermocline-dwelling foraminifera calcify over a depth range of several hundred meters; analysis of individual shells therefore allows insight to the hydrography of the upper water column. We analyzed δ~(18)O, δ~(13)C, and Mg/Ca of individual tests of the planktonic foraminifera Globorotalia inflata from a sediment core (GeoB7926-2) obtained from 20°N in the eastern tropical Atlantic. To facilitate sample throughput, tests were cleaned before Mg/Ca analysis using a pipette robot. The eight samples came from five time periods with contrasting climate states. Median reconstructed temperatures were lowest during the warmth of the B?lling Aller?d BA) (11.8°C), while highest temperatures (>14°C) were recorded during the cold periods of the Last Glacial Maximum (LGM), late Heinrich Stadial 1 (HS1), and the Younger Dryas (YD). Southward shift in the subtropical gyre during Northern Hemisphere cold periods and modulation by upwelling could explain the temperature change but not all of the salinity change. δ~(18)O_(seawater-IVC) indicated that salinity was higher than the global average during the LGM, with very high salinity excursions in HS1 and a smaller excursion in the YD. The upwelling signature was most strongly imprinted on range in δ~(13)C. The large changes in salinity and δ~(13)C between time slices cannot be explained by upwelling intensity but indicate the presence of a very saline water mass, with low δ~(13)C, in the eastern North Atlantic subsurface during Northern Hemisphere cold periods.
机译：温跃层有孔虫在几百米的深度范围内钙化；因此，通过对单个贝壳的分析，可以了解上部水柱的水文情况。我们分析了热带大西洋东部20°N获得的沉积物岩芯（GeoB7926-2）中浮游有孔虫球状膨胀体的δ~（18）O、δ~（13）C和Mg/Ca。为了促进样本吞吐量，在使用移液管机器人进行Mg/Ca分析之前，对试验进行清洁。这八个样本来自五个时间段，气候状况截然不同。在温暖的B？阿勒？d BA）（11.8°C），而最高温度（>14°C）记录在末次冰期最大期（LGM）、海因里希斯塔代尔1号晚期（HS1）和较年轻的仙女木（YD）的寒冷时期。北半球寒冷期副热带环流的南移和上升流的调制可以解释温度变化，但不是所有的盐度变化。δ~（18）O_（海水IVC）表明LGM期间盐度高于全球平均值，HS1中的盐度漂移非常高，YD中的盐度漂移较小。上升流特征在δ~（13）C的范围内最强烈。时间片之间盐度和δ~（13）C的巨大变化不能用上升流强度来解释，但表明存在非常咸的水团，δ~（13）C较低，在北半球寒冷时期北大西洋东部的地下。

著录项

  • 来源
    《Paleoceanography》 |2020年第8期|共19页
  • 作者

    Heather J. H. Johnstone; Henning Kuhnert; Torsten Bickert; Oscar Romero; Heiko P?like;

  • 作者单位

    MARUM-Center for Marine Environmental Sciences University of Bremen Bremen Germany;

    MARUM-Center for Marine Environmental Sciences University of Bremen Bremen Germany;

    MARUM-Center for Marine Environmental Sciences University of Bremen Bremen Germany;

    MARUM-Center for Marine Environmental Sciences University of Bremen Bremen Germany;

    MARUM-Center for Marine Environmental Sciences University of Bremen Bremen Germany;

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

    Single; Tests; Thermocline;

    机译：单身;测试;热控;

相似文献

  • 外文文献
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