| 早全新世降温事件的湖泊沉积证据 |
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| 引用本文： | 金章东,沈吉,王苏民,张恩楼.早全新世降温事件的湖泊沉积证据[J].高校地质学报,2003,9(1):11-18. |
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| 作者姓名： | 金章东 沈吉 王苏民 张恩楼 |
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| 作者单位： | 1. 中国科学院,南京地理与湖泊研究所,湖泊沉积与环境重点实验室,南京,210008;南京大学,成矿作用国家重点实验室,南京,210093
2. 中国科学院,南京地理与湖泊研究所,湖泊沉积与环境重点实验室,南京,210008 |
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| 基金项目： | 国家自然科学基金 (批准号 :40 0 0 3 0 0 1)，国家重点基础研究专项经费资助项目 (G19990 43 40 0 )资助项目 |
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| 摘 要： | 我国华北干旱－半干旱区封闭湖泊流域化学风化历史记录了全新世以来次级的气候环境波动过程。高精度的沉积物地球化学、物理及生物参数变化表明，在全新世早－中期过渡阶段存在一次强降温气候事件，具体表现为流域化学风化减弱（高Rb/Sr比）、湖泊产生力减弱（低有机碳）以及湖泊水位下降。虽然该事件的寒冷程度比Younger Dryas弱，但是其与来自湖沼（包括北极、非洲、北美、西欧、青藏高原、祁连山等）、海洋（比北大西洋、地中海、加勒比海等）、欧－美大陆生物组合、极地冰芯等在内的环境记录的冷事件发生时间基本一致，集中发生于8.0-8.5ka B.P.之间。
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| 关 键 词： | 早全新世 湖泊沉积 干旱－半干旱地区 气候事件 古气候 |
| 文章编号： | 1006-7493(2003)01-11-08 |
| 修稿时间： | 2002年10月28 |
Evidence for Early Holocene Cold Event From Lake Sediments |
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| JIN Zhang-dong ,SHEN Ji ,WANG Su-min and ZHANG En-lou.Evidence for Early Holocene Cold Event From Lake Sediments[J].Geological Journal of China Universities,2003,9(1):11-18. |
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| Authors: | JIN Zhang-dong SHEN Ji WANG Su-min and ZHANG En-lou |
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| Institution: | JIN Zhang-dong 1,2,SHEN Ji 1,WANG Su-min 1 and ZHANG En-lou 1 |
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| Abstract: | Analysis of the sediment from an inland closed lake, Daihai Lake, located in the semi-arid and semi-humid zone in north China has revealed the decadal- to centennial-scale Holocene climate fluctuations provided by chemical weathering records. High-resolution geochemical, physical and biological proxies from the lake sediments indicate that there is a strong cold climate event in the Early to Middle Holocene transition (EMHT) characterized by weak weathering (sediments with higher Rb/Sr ratios) in single watershed, lake productivity decrease and lower lake level. Although its cold magnitude is weaker than that of Younger Dryas, the coinstantaneous cooling records from lakes (North pole, Africa, North America, West Europe, Tibet, Greenland and north China), oceans (North Atlantic, Mediterranean, Caribbean Sea), mollusk sequences from Europe-American continent, and pole ice cores including Greenland GRIP and GISP2 all indicate a global climate signal which is typically centered between 8.0 and 8.5 ka B.P.. |
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| Keywords: | semi-arid and semi-humid zone Holocene climate closed lake climatic event |
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