Late quaternary paleoclimate in the eastern Mediterranean region from stable isotope analysis of speleothems at Soreq Cave, Israel
Late quaternary paleoclimate in the eastern Mediterranean region from stable isotope analysis of speleothems at Soreq Cave, Israel
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DOI：
10.1006/qres.1997.1883
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发表时间：
1997-03-01
影响因子：
2.3
通讯作者：
Kaufman, A
中科院分区：
文献类型：
--
作者：
BarMatthews, M;Ayalon, A;Kaufman, A
过去 25,000 年来东地中海大陆古气候是通过对以色列 Soreq 洞穴洞穴的高分辨率岩相学、稳定同位素和年龄研究确定的。 δ(18)O-δ(13)C 趋势表明，所有超过 7000 年的洞穴形成条件与今天不同。距今25,000年至17,000年的时期δ(18)O 和 δ(13)C 值最高，这表明沉积温度为 12°C - 16°C，年降雨量为 300-450 毫米，植被为典型的 C-3-C-4 混合类型。距今 17,000 至 10,000 年（北欧冰川消退）δ(18)O 值逐渐下降，与变暖（2 至 3 摄氏度）和降水逐渐增加相关。 δ(13)C 的同时减少给出了 C-3 型植被的预期范围。这一时期还显示出显着的 delta(18)O 和 delta(13)C“尖峰”，它们与全球事件（例如海因里希事件和新仙女木体育场）相关。洞穴生物生长于距今 10,000 至 7000 年之间。具有独特的岩相学特征，显示出各种颜色的不规则薄层和大量碎屑。它们具有最低的 delta(18)O（相当于 1000 毫米的降雨量）和最高的 delta(13)C（由洪水事件导致的土壤覆盖）。距今 7000 至 1000 年条件变得更接近今天的条件。这项研究表明，北欧和北非所认识到的全球事件在地中海东部也很明显，并且主要反映在降雨率的巨大变化上。 (C) 1997 年华盛顿大学。
The eastern Mediterranean continental paleoclimate during the past 25,000 years was determined by a high-resolution petrographic, stable isotopic, and age study of speleothems from Soreq Cave, Israel. delta(18)O-delta(13)C trends indicate that all speleothems older than 7000 yr formed under conditions that differ from those of today. The period from 25,000 to 17,000 yr B.P. was characterized by the highest delta(18)O and delta(13)C values, which indicate deposition at temperatures of 12 degrees-16 degrees C, annual rainfall of 300-450 mm, and vegetation typical of a mixed C-3-C-4 type. From 17,000 to 10,000 yr B.P. (deglaciation in northern Europe) delta(18)O values dropped progressively, correlative with warming (2 degrees-3 degrees C) and a gradual increase in precipitation. A simultaneous decrease in delta(13)C gives a range expected for C-3-type vegetation. This period also shows significant delta(18)O and delta(13)C ''spikes'' which are correlatable with global events (e.g., Heinrich events and the Younger Dryas Stade). The speleothems that grew between 10,000 and 7000 yr B.P. have a unique petrography showing irregular thin laminae of various colors and much detritus. They have the lowest delta(18)O (corresponding to similar to 1000 mm rain) coupled with the highest delta(13)C (caused by flooding events which stripped the soil cover). From 7000 to 1000 yr B.P. conditions became closer to those of today. This study demonstrates that global events which were recognized in Northern Europe and North Africa are also evident in the eastern Mediterranean and are reflected principally by large changes in the rainfall rate. (C) 1997 University of Washington.