泥炭记录的帕米尔高原晚全新世温度变化研究  

Peatδ^(13)C_(α-cellulose)-cellulose-based late Holocene temperature reconstruction in Pamir,China

作　　者：王馨 冉敏 杨运鹏 琚立 WANG Xin;RAN Min;YANG Yunpeng;JU Li(College of Geography and Environmental Science,Henan University,Kaifeng 475004,Henan,China;National Demonstration Center for Environmental and Planning,Henan University,Kaifeng 475004,Henan,China;Henan Key Laboratory of Earth System Observation and Modeling,Henan University,Kaifeng 475004,Henan,China)

机构地区：[1]河南大学地理与环境学院,河南开封475004 [2]河南大学环境规划国家级实验教学示范中心,河南开封475004 [3]河南省地球系统观测与模拟重点实验室,河南开封475004

出　　处：《地理科学进展》2022年第8期1467-1477,共11页Progress in Geography

基　　金：国家自然科学基金项目(41502168,41771234)。

摘　　要：近年来,“全新世温度谜题”已经受到全球古气候学者的广泛关注,为了解决这一谜题,需要在全球不同区域进行更多的全新世温度重建。帕米尔高原位于亚洲内陆核心区域,目前有关帕米尔高原全新世气候变化的研究相对较少,且已有的研究主要集中于相对湿度(或降水)变化的研究,而涉及温度变化的成果则相对较少。论文首先研究了表土碳同位素与气候因子之间的相关关系,结果显示帕米尔高原的δ^(13)C_(org)与温度正相关;进一步在7个AMS^(14)C测年数据的支持之下,基于175个泥炭δ^(13)C_(α-cellulose)分析,重建了帕米尔高原过去约5000 a的温度变化历史。结果发现:帕米尔高原晚全新世以来整体呈现波动升温趋势,约5000~3600 cal a BP阶段处于缓慢降温期;约3600~200 cal a BP处于波动升温期;驱动机制分析显示,约3600 cal a BP之前温度下降主要是夏季太阳辐射下降导致的,约3600 cal a BP之后温度上升是由温室气体辐射强迫增强导致的。In recent years,"Holocene temperature conundrum"has received extensive attention from paleoclimatologists.In order to solve this conundrum,more Holocene temperature reconstruction needs to be carried out in different regions of the world.The Pamir region of Xinjiang,China,is located in the core area of inland Asia and many scholars have conducted in-depth studies on the Holocene climate change in this region.However,these studies are mainly focused on precipitation(or humidity)rather than temperature.In this study,the correlation between topsoil carbon isotopes and climatic factors(temperature and precipitation)was first established,and the results showed thatδ^(13)C_(org)in Pamir was highly positively correlated with temperature.Supported by the AMSC dating data of seven samples and 175 peatδ^(13)C_(α-cellulose)data,the temperature variation in Pamir during the past~5000 year was reconstructed.Generally,Pamir has shown a warming climate during late Holocene and the change can be further divided into two sub-stages:a fluctuating cool period from~5000 cal a BP to~3600 cal a BP and a fluctuating warming period since~3600 cal a BP.The driving mechanism analysis shows that the temperature decrease before~3600 cal a BP was mainly controlled by the decrease of summer solar radiation and the temperature increase since~3600 cal a BP was mainly controlled by the enhanced radiative forcing of greenhouse gases and human activity.

关 键 词：晚全新世 温度变化 泥炭 δ^(13)C_(α-cellulose) 帕米尔高原 

分 类 号：P534.632[天文地球—第四纪地质学] P532[天文地球—古生物学与地层学]