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Changes of the trace metals in ice core during 1915-2016 in coastal eastern Antarctica

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Advances in Climate Change Research 2024年第4期15卷 596-608页

作者： Jing-Wen LIU Chuan-Jin LI Gui-Tao SHI Yan LIU Zhi-Heng DU Ming-Hu DING Shao-Peng GAO Cun-De XIAO Shi-Chang KANG Bo SUN State Key Laboratory of the Cryosphere Science Northwest Institute of the Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory for Polar Science of State Oceanic Administration Polar Research Institute of ChinaShanghai 200136China Key Laboratory of Geographic Information Science(Ministry of Education) School of Geographic Sciences and Institute of Eco-ChongmingEast China Normal UniversityShanghai 200241China Institute of Tibetan Plateau and Polar Regions Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Instituie of the Tibetan PlateauChinese Academy of SciencesBeijing 100101China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

Antarctic trace metal records provide important information for grasping the influence of human activities on the environment over the last *** CA2016-75 ice core is located along the East Antarctic Zhongshan Station-Dome A,enhances the record of metals research in the East Antarctic region,and its high-resolution supplies data support for the study of high-frequency climatic drivers and the effect of human activities on the Antarctic environment.A thorough dataset on seven trace metals(Al,Fe,Mn,Cu,Zn,Ba and Pb)in a coastal ice core in eastern Antarctica during the previous 102 years(1915-2016)is presented in this *** has the lowest concentration(9.51±20.95 pg g^(-1)),and Ba has the highest concentration(36.57±51.35 ng g^(-1)).Notable variations are observed between the pre-1968 AD and post-1968 AD phases for Mn,Zn and *** abrupt,remarkable increase in the concentrations coincided with the change of metal smelting production in the southern *** addition to this,it may also be related to local Antarctic scientific research *** and Fe,the primary crustal elements,are essentially obtained from soil dust;Cu shows high crustal enrichment factors(EFc,>10),indicating that it is notably affected by anthropogenic ***,the anthropogenic activities in the Southern Hemisphere have had an impact on lead deposition in *** study not only enriches the trace metal historical record along the Zhongshan Station-Dome A but also provides a high-resolution ice core record,which is very crucial for the reconstruction of trace metal concentration changes in the last 100 years.

关键词： Eastern Antarctica ice core Trace metals Human activities

Microscopic Analyses of Insoluble Particles in an ice core of ürümqi Glacier No. 1: Quantification of Mineral and Organic Particles

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Journal of Earth Science 2011年第4期22卷 431-440页

作者： Nozomu Takeuchi Yoriko Ishida 李忠勤 Department of Earth Sciences Graduate School of Science Chiba University Chiba 263-8552 Japan State Key Laboratory of Cryospheric Sciences/Tien Shan Glaciological Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences College of Geography and Environment Sciences Northwest Normal University

Insoluble particle concentration in ice cores is commonly analyzed as a proxy for varia- tions in atmospheric mineral dust （aerosol concentration）. However, recent studies have revealed that the mineral dust is not only a constituent of the particles but that biogenic organic particles are also contained. We microscopically analyzed insoluble particles in a shallow ice core drilled on a mountain glacier, the Urumqi Glacier No. 1, in eastern Tienshan, China. We distinguished different morphological particles in the ice core and quantified them separately. Results showed that the insoluble particles in this ice core consisted mainly of mineral particles, amorphous organic particles, pollen, and micro- organisms. Mineral particles were the most dominant, accounting for approximately 67% of total par- ticles, and amorphous organic particles were the second most dominant, accounting for approximately 33% of the total. The annual variation in the particles for the last 11 years differed between mineral and amorphous organic particles. The results suggest that the total insoluble particle concentration in the ice core reflects not only the atmospheric mineral dust but also the organic particles blown from ground soil or produced by microbes on the glacial surface.

关键词： ice core insoluble particle mineral dust microbes organic particles.

A shallow ice core from East Greenland showing a reduction in black carbon during 1990-2016

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Advances in Climate Change Research 2020年第4期11卷 360-369页

作者： DU Zhi-Heng XIAO Cun-De DOU Ting-Feng LI Chuan-Jin DING Ming-Hu Sangeeta SHARMA MA Xiang-Yu WANG Shi-Meng ZHANG Wang-Bing State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou511458China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing100875China University of Chinese Academy of Science Beijing100049China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing100081China Climate Research Division Environment and Climate Change CanadaTorontoM3H 5T4Canada School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing210023China

This study reports on the measurements of ion and refractory black carbon(rBC)concentrations in a shallow(10.96 m)ice core sample which was drilled from the field site of the East Greenland ice core Project(EGRIP)in July,*** results provide a recent record of rBC deposition in the East Greenland ice sheet from 1990 to *** annual variability in oxygen(δ^(18)O)and hydrogen(δD)isotopic compositions indicated that notably warm events occurred since *** in rBC occurred during summer seasons,which may be attributed to the burning of biomass in boreal *** rBC record and analysis of historical air trajectories using the HYSPLIT model indicated that anthropogenic BC emissions from Russia,North America and Europe contributed to the majority of rBC deposition in the Greenland region,and a reduction in anthropogenic BC consumption in these areas played a dominant role in the decrease in BC concentrations since *** record also suggests that the emissions from the East Asian region(China)contributed very little to the recorded BC concentrations in East Greenland ice *** model results indicated that radiative forcing due to BC had decreased significantly since 1990,and had remained below 0.02W m^(-2) since 2000.

关键词： East Greenland ice core Black carbon Seasonal variability Potential emission sources

Variation of culturable bacteria along depth in the East Rongbuk ice core,***

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Geoscience Frontiers 2012年第3期3卷 327-334页

作者： Liang Shen Tandong Yao Baiqing Xu Hongmei Wang Nianzhi Jiao Shichang Kang Xiaobo Liu Yongqin Liu Institute of Tibetan Plateau Research Chinese Academy of Sciences(CAS)Beijing 100085China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China

ice melt water from a 22.27 m ice core which was drilled from the East Rongbuk Glacier, Mt. Everest was incubation in two incubation ways： plate melt water directly and enrichment melt water prior plate, respectively. The abundance of cultivable bacteria ranged from 0-295 CFU mL-I to 0--1720 CFU mL-1 in two incubations with a total of 1385 isolates obtained. Comparing to direct cultivation, enrichment cultivation recovered more bacteria. Pigment-producing bacteria accounted for an average of 84.9% of total isolates. Such high percentage suggested that pigment production may be an adaptive physiological feature for the bacteria in ice core to cope with strong ultraviolet radiation on the glacier. The abundances of cultivable bacteria and pigment-producing isolates varied synchronously along depth： higher abundance in the middle and lower at the top and bottom. It indicated that the middle part of the ice core was hospitable for the microbial survival. Based on the physiological properties of the colonies, eighty-nine isolates were selected for phylogenetic analysis. Obtained 16S rRNA gene sequences fell into four groups： Firmicutes, Alpha-Proteobacteria, Gamma-Proteobacteria, and Actinobacteria, with the Firmicutes being dominant. Microbial compositions derived from direct and enrichment cultivations were not overlapped. We suggest that it is a better way to explorethe culturable microbial diversity in ice core by combining the approaches of both direct and enrichment cultivation.

关键词： Tibetan Plateau ice core Cultivable bacteria

Atmospheric insight to climatic signals of δ^18O in a Laohugou ice core in the northeastern Tibetan Plateau during 1960–2006

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Research in Cold and Arid Regions 2016年第5期8卷 367-377页

作者： WenTao Du ShiChang Kang Xiang Qin XiaoQing Cui WeiJun Sun Qilian Shan Station of Glaciology and Ecologic Environment State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China College of Population Resources and Environment Shandong Normal University Jinan Shandong 250014 China

ice documentation and response to prominent warming, especially after the 1990s, is further investigated because it is concerned whether ice records have absence. A δ^18O series of a Laohugou （LHG） shallow ice core （20.12 m） in the northeastern Tibetan Plateau was reconstructed covering the period of 1960–2006. The ice core δ^18O record had sig-nificant positive correlations with the warm season （May–September） air temperatures at adjacent meteorological stations and the 500 hPa temperatures in boreal China, indicating that the δ^18O record could be considered a credible proxy of regional temperature. A clear, cold temperature event in 1967 and rapid warming after the 1990s were captured in the LHG δ^18O series, revealing that it could record extreme air-temperature events on both regional and global scales. The LHG δ^18O variations had evident positive correlations with both the summer surface outgoing longwave radiation （OLR） in the Mongolia region and the summer meridional wind at 500 hPa in the LHG region during 1960–2006, suggesting that the increased OLR in the Mongolia region might have intensified the Mongolia Low and expanded the pressure gradient to the LHG region （the Shulehe High）, which would have pushed the westerlies further north and suppressed southward incursions of cold air into the LHG region, and thus augmented the temperature rise. The regional atmospheric circulation difference （1985–2006 minus 1960–1984） suggested that the anticyclone in the Mongolia region might have developed the easterly wind, which transported warmer air from the east toward the LHG region and weakened the cold penetration of the westerlies, resulting in the temperature rise since the middle 1980s.

关键词： δ^18O variations ice core outgoing longwave radiation meridional wind northeastern Tibetan Plateau

STUDIES ON THE BHQ ice core FROM THE LAW DOME, ANTARCTICA

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极地研究 1990年第1期 20-26页

作者： Huang Maohuan Li Jun Xie Zichu(Lanzhou Institute of Glaciology and Geocryology, Academia Sinica, Lanzhou 730000)Zhang Yunhui(Institute of Atomic Energy, Beijing 102413, China)

The structure of the ice core varies with depth, Its surface layer is firn, followed by an ice layer with random fabric pattern (beginning at 28m depth), then transformed to a small circle girdle pattern (beginning at 147 m depth) through a transition layer, finally to a single-maximum pattern (beginning at 191 m depth). The stratigraphic profile of the ice core is similar to those of other cores on the Law Dome, For BHQ located in the middle of a flow line from the summit to the coast, the initial depth of every specific layer is less than that in the upstream and larger than that in the downstream. The ice was analyzed for trace elememts using instrumental neutron activation technique. No tendency towards a systematic increase or decrease in the element concentrations in the past 4000 years has been found. The mean concentrations of Na and Al over the past 4000 years are higher than those in the Vostok ice core by factors of 9 and 4, respectively.

关键词： BHQ ice core ice structure trace elements Law Dome Antarctica.

Variations of the alpine precipitation from an ice core record of the Laohugou glacier basin during 1960-2006 in western Qilian Mountains, China

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Journal of Geographical Sciences 2015年第2期25卷 165-176页

作者： QIN Xiang CUI Xiaoqing DU Wentao DONG Zhiwen REN Jiawen CHEN Jizu State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute/Qilian Shah Station of Glaciology and Ecologic Environment CAS Lanzhou 730000 China Resource and Environment College of Lanzhou University Lanzhou 730000 China

The net accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains. A 20.12 m ice core was drilled in 2006 from the accumulation zone of Laohugou Glacier No.12 in the northeastern Tibetan Plateau, China. We obtained the precipitation from the ice core net accumulation during 1960-2006, and found out the relationship between Laohugou ice core record and other data from surrounding sites of the northeastern Tibetan Plateau. Results showed that during 1960-2006, the precipitation in the high mountains showed firstly an increasing trend, while during 1980 to 2006 it showed an obvious decreasing trend. Reconstructed precipitation change in the Laohugou glacier basin was consistent with the measured data from the nearby weather stations in the lower mountain of Subei, and the correlation coefficient was 0.619 （P〈0.001）. However, the precipitation in the high mountain was about 3 times more than that of the lower mountain. The precipitation in Laohugou Glacier No.12 of the western Qilian Mountains corresponded well to the net accumulation of Dunde ice core during the same period, tree-ring reconstructed precipitation, the measured data of multiple meteorological stations in the northeastern Tibetan Plateau, and also the changes of adjacent PDSI drought index. Precipitation changes of the Laohugou glacier basin and other sites of the northeastern Tibetan Plateau had significantly positive correlation with ENSO, which implied that the regional alpine precipitation change was very likely to be influenced by ENSO.

关键词： alpine precipitation ice core Laohugou Glacier No.12 Qilian Mountains

Anthropogenic trace metals in an ice core at Vestfonna,Svalbard, Norway

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Chinese Journal of Polar Science 2003年第1期14卷 41-47页

作者： Sumito Matoba Hideaki Motoyama Hideki Narita Okitsugu Watanabe National Institute of Polar Research National Institute of Polar ResearchInstitute of Low Temperature ScienceNational Institute of Polar Research Tokyo 173-8515 Japan National Institute for Environmental Studies Ibaraki 305-8506 JaTokyo 173-8515 JapanSapporo 060-0819 Japan Research Institute for Humanity and Nature Kyoto 602-0878JapanTokyo 173-8515 Japan

A 211 m depth ice core observation was carried out at the top of the Vestfonna ice Cap in Nordaustlandet, Svalbard, Norway in 1995. Chronology of the ice core was determined by tritium analysis and comparison to the volcanic eruption of Laki; the resulting accumulation rate is 0.34 0.35 m water eq.·yr -1 for the last 400 year. Concentrations of Al, V, Cr, Fe, Cu, Zn, As, Ag, Cd, Pb and U in an ice core have been determined by an inductively coupled plasma mass spectrometry (ICP MS) with a desolvated micro concentric nebulizer, which is a recent development and can achieve high sensitivity with low uptake rate of 60 mL/min. The concentrations of Pb, Cu, and Zn had increased from 1940s declined from 1970s to present. However, the profiles of Pb, Cu, and Zn were different and they seem to be influenced by the difference of sources. Since the ratios between Cu, Pb, and Zn in Svalbard is similar to that in French Alps, the source area of these elements is estimated to be Europe.

关键词： ice core heavy metal Svalbard ICP MS.

Source of major ions from an ice core of the No.12 Glacier in Laohugou Valley,Qilian Mountain

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Research in Cold and Arid Regions 2010年第6期2卷 522-528页

作者： XiaoQing Cui JiaWen Ren Xiang Qin WenTao Du WeiJun Sun GuangMingYu XiaoXiang Wang WeiZhen Sun Qilian Shan Station of Glaciology and Ecologic Environment LanzhouGansu 730000China State Key Laboratory of Cryospheric Science Cold and Arid Region Environment and Engineering Research InstituteChinese Academy of SciencesLanzhouGansu 730000China.

In June 2006,a 20.12 m shallow ice core was recovered from an elevation of 5,040 m in the northern branch firn basin of No.12 Glacier,Great Snow Mountain,in the western part of Qilian Mountain,***(δ 18 O),major soluble ions,and radionuclide(β-activity) measurements from the ice core revealed a 46-year record(1960-2006).In this paper,the method of sea-salt ion tracer,correlation analysis and trend analysis were used in this research to confirm the source of the chemical *** correlation analysis and HYSPLIT backward trajectory analysis suggests that atmospheric soluble dust species dominate the chemical signature.

关键词： ice core source the No.12 Glacier at Laohugou ions Qilian Mountain