...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geochemistry, geophysics, geosystems >Alkenone paleothermometry in the North Atlantic: A review and synthesis of surface sediment data and calibrations
【24h】

Alkenone paleothermometry in the North Atlantic: A review and synthesis of surface sediment data and calibrations

机译：北大西洋烯酮古温度计：地表沉积物数据和标定的综述与综合

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

Despite a clear correlation of alkenone unsaturation and sea surface temperatures (SST) throughout most parts of the ocean, scatter of the regression for various calibration equations has been shown to increase significantly at low SSTs. In this study, we combine previously published (n = 101) and new (n = 51) surface sediment data from the northern North Atlantic to constrain uncertainties of alkenone paleothermometry at low SSTs and to discuss possible sources of the increased scatter in the regression. The correlation between alkenone unsaturation and SSTs is strongest, in particular at the cold end (SSTs < 10 degrees C)' when the tetra-unsaturated alkenones (C-37:4) are included in the unsaturation index (expressed as U-37(K)) and regressed against spring-summer temperature. Surface ocean salinity and sea ice cover are not correlated with U-37(K) per se. However, samples located in regions of permanent winter sea ice cover exhibit a significant warm bias. Deviation from the linear regression is posited to be related to a number of additional non-exclusive factors, such as advection of allochthonous material, local temperature stratification, and uncertainty in the absolute age of surface sediment samples assumed to be equivalent to modern conditions. We conclude that alkenone unsaturation allows accurate reconstruction of SST records from many regions of the North Atlantic if the factors confounding alkenone paleothermometry detailed here can be excluded.
机译：尽管整个海洋的大部分地区烯酮的不饱和度与海面温度（SST）都有明显的相关性，但在低SST时，各种校准方程式的回归散点已显示出明显增加。在这项研究中，我们结合了来自北大西洋北部的先前公布的（n = 101）和新的（n = 51）地表沉积物数据，以约束低SST时烯酮古温度计的不确定性，并讨论了回归中散布增加的可能来源。烯酮不饱和度与SSTs之间的相关性最强，特别是在冷端（SSTs <10摄氏度）'时，不饱和指数中包括四不饱和烯酮（C-37：4）（表示为U-37（ K）），并针对春季夏季温度进行回归。地表海洋盐度和海冰覆盖度本身与U-37（K）不相关。但是，位于冬季永久性海冰覆盖区域的样品表现出明显的温暖偏向。线性回归的偏差被认为与许多其他非排他性因素有关，例如对流异质物质的平流，局部温度分层以及假定与现代条件等效的地表沉积物样品绝对年龄的不确定性。我们得出的结论是，如果可以排除与烯酮古体温测定法混杂的因素，则烯酮不饱和度可以准确重建北大西洋许多地区的SST记录。

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