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岱海的"中世纪暖期"
引用本文:金章东,沈吉,王苏民,张恩楼.岱海的"中世纪暖期"[J].湖泊科学,2002,14(3):209-216.
作者姓名:金章东  沈吉  王苏民  张恩楼
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
基金项目:国家自然科学基金(40003001)、国家重点基础研究专项经费(G1999043400)联合资助.
摘    要:内蒙古岱海沉积物近2200a来Rb/Sr比值、CaCO3和有机碳含量的变化展现了包括中世纪暖期(MWP)及小冰期(LIA)等典型气候事件在内的环境演化过程,总体表现为暖期的沉积物Rb/Sr比值低,冷期的则高:CaCO3和有机碳含量则相反。这里,以单一流域化学风化记录表明我国北方存在明显的中世纪暖期,发生时间约900-1200aB.P..主要环境特征表现为流域化学风化的显著增强(低Rb/Sr比值)、生物生产力逐步提高(高有机碳)、湖泊水位大幅度抬升的湖泊沉积记录,其间经历的化学风化是近两千年内最强的,并且其发生时间与全球其他地区基本一致。

关 键 词:湖泊沉积  化学风化  气候变迁  中世纪暖期  岱海  古气候  有机碳
收稿时间:2001/11/13 0:00:00
修稿时间:2001年11月13

The Medieval Warm Period in the Daihai Area
JIN Zhang dong,SHEN Ji,WANG Sumin and ZHANG Enlou.The Medieval Warm Period in the Daihai Area[J].Journal of Lake Science,2002,14(3):209-216.
Authors:JIN Zhang dong  SHEN Ji  WANG Sumin and ZHANG Enlou
Institution:JIN Zhangdong 1,2 SHEN Ji 1 WANG Sumin 1 ZHANG Enlou 1
Abstract:Based on the rubidium to strontium (Rb/Sr) ratio, carbonate (CaCO 3 ) content and organic carbon concentration (C org ) record in lake sediments from the Daihai Lake, Inner Mongolia, dated by AMS 14 C and 210 Pb, the climatic and environmental change process was reconstructed since the last 2,200 years, including two important climate events, i.e. the Medieval Warm Period and Little Ice Age. An increase Rb/Sr ratio but a decrease both CaCO 3 and C org correspond to a cold period, and vice versa. In this paper, we first suggest that there existed the Medieval Warm Period in the northern China during 900-1200a B.P. by a high resolution lake record characterized according to lower Rb/Sr ratios and higher CaCO 3 and C org concentrations in the sediments from a single watershed, which a warm and humid environment was demonstrated by significant increase of chemical weathering and by a progressive increase of biologic productivity, and by a high lake level. The Medieval Warm Period has not only an inner climatic fluctuant, but also the strongest chemical weathering during the last 2,200 years, which are indicated by a high resolution natural record in northern China. Furthermore, the Medieval Warm Period in northern China is contemporaneous with the worldwide event identified in the lakes, oceans, land mollusk sequences, polar ice cores, pollens and historical documents.
Keywords:Daihai Lake  chemical weathering  climate change  Medieval Warm Period
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