...
  • 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 >The Eastern Mediterranean paleocilmate as a reflection of regional events: Soreq cave, Israel
【24h】

The Eastern Mediterranean paleocilmate as a reflection of regional events: Soreq cave, Israel

机译：东部地中海古气候反映了区域性事件：以色列Soreq洞穴

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 climate of the Eastern Mediterranean region of the last 60 ky was determined by a high resolution study of the oxygen and carbon isotopic composition (1500 measurement pairs) of speleothems from the Soreq cave, Israel, with chronology provided by 53 precise ~(230)Th-~(234)U (TIMS) ages. The high precision of the speleothem TIMS ages permits us to determine the timing of regional climatic events in the Eastern Mediterranean region and to see if they correlate with global events. During the period from 60 to 17 ky, the #delta#~(18)O and #delta#~(13)C values were generally 2-2.5 per thousand higher than during the period from 17 ky to present. This is consistent with the climatic transition from glacial to interglacial. Within the 60 to 17 ky period, the Soreq cave stable isotope profile includes four cold peaks (at 46, 35, 25 and 19 ky) and 2 warm peaks (at 54 and 36 ky). In addition, the period < 17 ky has two more cold peaks at 16.5 and from 13.2 to 11.4 ky. The ages of four of the six cold peaks correlate well with the ages of three Heinrich events (H1, H2, H5) and with the age of the Younger Dryas. However, the other two Heinrich events are not reflected in the Soreq cave record. Several other isotope peaks which appear during the last 7 ky are contemporaneous with regional climatic events in the Middle East and North Africa. In addition to the drop in ~#delta#~(18)O and #delta#~(13)C observed between the last glacial and the Holocene, sharp simultaneous drops in (~(234)U/~(238)U)_0 ratios, Sr concentrations and in ~(87)Sr/~(86)Sr are also observed, suggesting that the latter are climate related. These variations are interpreted in terms of major changes in the temperature, the mean annual rainfall and its isotopic composition, the isotopic composition of the Mediterranean vapor source, the soil moisture conditions, and in the mixing proportions of sources with different ~(87)Sr/~(86)Sr ratios (sea spray, dust particles and dolomitic host rock).
机译：通过对以色列Soreq洞穴的蛇麻科动物的氧气和碳同位素组成（1500个测量对）进行高分辨率研究，确定了最近60 ky东部地中海地区的气候，并由53精确的〜（230）提供了年代学。 Th-〜（234）U（TIMS）年龄。 ele骨TIMS年龄的高精度使我们能够确定东地中海区域区域性气候事件的发生时间，并查看它们是否与全球性事件相关。在60至17 ky期间，＃delta＃〜（18）O和＃delta＃〜（13）C值通常比从17 ky到现在的期间高2-2.5 /千。这与从冰期到间冰期的气候转变是一致的。在60至17 ky期间，Soreq洞穴稳定同位素分布包括四个冷峰（分别在46、35、25和19 ky处）和2个暖峰（在54和36 ky处）。此外，<17 ky的周期在16.5和13.2至11.4 ky处还有两个冷峰。六个冷峰中的四个的年龄与三个Heinrich事件（H1，H2，H5）的年龄以及较年轻的树妖的年龄相关。但是，其他两个海因里希事件并未反映在Soreq洞穴记录中。在最后7个ky期间出现的其他几个同位素峰与中东和北非的区域气候事件同时发生。除了在末次冰期与全新世之间观测到的〜＃delta＃〜（18）O和＃delta＃〜（13）C下降之外，（〜（234）U /〜（238）U）同时急剧下降还观察到_0比率，Sr浓度和〜（87）Sr /〜（86）Sr中的浓度，这表明后者与气候有关。这些变化是根据温度，年平均降水量及其同位素组成的主要变化，地中海蒸气源的同位素组成，土壤湿度条件以及不同〜（87）Sr的源的混合比例来解释的/〜（86）Sr比率（海浪，灰尘颗粒和白云岩基质岩石）。

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