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Climatic changes documented by stable isotopes of sedimentary carbonate in Lake sugan, northeastern Tibetan Plateau of china,since 2.kaBP

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science Bulletin 2005年第17期 116-125页

作者： QIANG mingrui1,2. CHEN Fahu2. ZHANG Jiawu2. GAO shangyu1 & ZHOU Aifeng2.1. china {2. of Desert research at Beijing Normal university and Key laboratory of environmental Changes and Natural Disaster, ministry of education of china, Beijing Normal university, Beijing 100875, china 2. center for arid environment and paleoclimate research (CAEP), national laboratory of western china’s environmental system, min-istry of education of china, lanzhou university, lanzhou 730000, china

Lake sugan at the northern edge of the Qaidam Basin was selected as the research object. The temporal se-quence of sedimentary cores retrieved from Lake sugan since 2.kaBP was reconstructed using the 2.0Pb, AMs 14C and conventional 14C dating methods. Carbon and oxygen iso-topes of carbonate in the fine-grained lake sediments were analysed. Combined with the changes of δ 18O values of sur-face water and air temperature observation data in the study area, it might be thought that the δ 18O value of the carbon-ate indicates effective moisture, and the changes in δ 13C val-ues are related to annual freeze-up duration of the lake and indirectly indicate air temperature changes in winter half year. From the above, the sequence of climatic changes in the region since 2.kaBP was established. The climatic changes experienced five stages: Warm-dry climate during 0-190 AD; cold-dry climate during 190-580 AD; warm-dry cli-mate during 580-12.0 AD (MWP); cold-wet climate during 12.0-1880 AD (LIA); cold-dry climate during 1880-1950 AD; and climate warming since 1950s. The air temperature changes in winter half year reflected by carbon isotope since 2.kaBP are in good agreement with the historical literature records and other geologic records, which shows that the climate changes recorded by the stable isotopes from Lake sugan since 2.kaBP are of universal significance.

关键词： Lake sugan carbonate stable isotope climatic changes.

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High-resolution climate change in mid-late Holocene on Tianchi Lake,Liupan Mountain in the Loess Plateau in central china and its significance

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science Bulletin 2010年第20期55卷 2118-2121页

作者： ZHOU AiFeng,sUN HuiLing,CHEN FaHu ,ZHAO Yan,AN ChengBang,DONG GuangHui,WANG ZongLi & CHEN JianHui center for arid {2. and paleoclimate research,Key laboratory of western china’s environmental system(ministry of {12.),lanzhou 730000,china center for arid {2. and paleoclimate research Key Laboratory of Western China’s Environmental System (Ministry of Education) Lanzhou China

According to a core from Tianchi Lake,Liupan Mountain in Loess Plateau sediment,fossil pollen assemblages,magnetic susceptibility(Ms)and color scale were measured based on reliable Abies leaf macrofossils radiocarbon *** recovered a very good high-resolution mid-late Holocene climate change achieve for the transition area of the East Asia monsoon region and northwest arid *** results show that the basic climate background was in agreement with the records from cave records in monsoon regions in eastern ***,it shows more detailed records in abrupt climate change.

关键词： high resolution mid-late Holocene Tianchi Lake

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Light-absorbing impurities on Keqikaer Glacier in western Tien shan: concentrations and potential impact on albedo reduction

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research in Cold and arid Regions 2017年第2期9卷 97-111页

作者： YuLan Zhang shiChang Kang min Xu Michael sprenger TanGuang Gao ZhiYuan Cong ChaoLiu Li Junming Guo ZhiQiang Xu Yang Li Gang Li XiaoFei Li YaJun Liu HaiDong Han state Key laboratory of Cryospheric sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Science Lanzhou Gansu 73000 China CAs center for Excellence in Tibetan Plateau Earth sciences Beijing 100101 China Institute for Atmospheric and Climate science ETH Zurich CH-8092 Zurich Switzerland Key laboratory of western{2.'s environmental system (ministry of education) College of Earth and Environmental Sciences Lanzhou University Lanzhou Gansu 730000 China Key laboratory of Tibetan environment Changes and Land surface Processes Institute of Tibetan Plateau ResearchCAS Beijing 100101 China Meteorological Bureau of Jimunai County Jimunai Xinjiang 836800 China arid Meteorological research Institute Lanzhou Meteorological Bureau Lanzhou Gansu 730000 China

Light-absorbing impurities on glaciers are important factors that influence glacial surface albedo and accelerate glacier melt. In this study, the quantity of light-absorbing impurities on Keqikaer Glacier in western Tien shan, Central Asia, was measured. We found that the average concentrations of black carbon was 2.180 ng/g, with a range from 2.0 ng/g to more than 10,000 ng/g. The average concentrations of organic carbon and mineral dust were 1,738 ng/g and 194 μg/g, respectively. Based on simulations performed with the snow Ice Aerosol Radiative model simulations, black carbon and dust are responsible for approximately 64% and 9%, respectively, of the albedo reduction, and are associated with instantaneous radiative forcing of 32..18 W/m2.ranging from 142.16 to 619.2. W/m2. and 2..05 W/m2.ranging from 0.15 to69.77 W/m2., respectively. For different scenarios, the albedo and radiative forcing effect of black carbon is considerably greater than that of dust. The estimated radiative forcing at Keqikaer Glacier is higher than most similar values estimated by previous studies on the Tibetan Plateau, perhaps as a result of black carbon enrichment by melt scavenging. Light-absorbing impurities deposited on Keqikaer Glacier appear to mainly originate from central Asia, siberia, western china(including the Taklimakan Desert) and parts of south Asia in summer, and from the Middle East and Central Asia in winter.A footprint analysis indicates that a large fraction(>60%) of the black carbon contributions on Keqikaer Glacier comes from anthropogenic sources. These results provide a scientific basis for regional mitigation efforts to reduce black carbon.

关键词： light-absorbing impurities black carbon mineral dust glacier snow albedo Tien shan

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