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Constraints of authigenic carbonates on trace elements (Sr,Mg) of lacustrine ostracod shells in paleoenviron-ment reconstruction and its mechanism

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Science China earth sciences 2008年第5期51卷 654-664页

作者： hu guang1,2. jin zhangdong1 & zhang fei3 1 state key laboratory of loess and quaternary geology,{2., chinese academy of sciences, xi’an 710075, China 2.Graduate University of the chinese academy of sciences, Beijing 100049, China 3 College of Resources and environmental Science, Nanjing Agricultural University, Nanjing 2.0095, China state key {2. of {2. and quaternary geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China Graduate University of the chinese academy of sciences Beijing China College of Resources and environmental Science Nanjing Agricultural University Nanjing China

Molar ratios of Mg/Ca and Sr/Ca were measured in two species of ostracod shells preserved in the upper core (15–55 m) of the Hequing Basin in Yunnan Province, southwest China. By correlating the molar ratios between Mg/Ca and Sr/Ca and comparing them with Sr concentrations of the sediments, we suggested that: (1) the molar Mg/Ca and Sr/Ca ratio variations in respective ostracod primo reflected the changes in its ambient water composition and ecology; (2. the molar Sr/Ca ratios responded better to the salinity change linearly than Mg/Ca without aragonite precipitation in the system, and otherwise there was no linear relation between them; and (3) the molar Sr/Ca ratios were mainly controlled by salinity and authigenic carbonate precipitation, whereas the molar Mg/Ca ratios were related to both salinity and temperature. In fact, the rate of ostracod growth owing to temperature controls the fluctuation of Mg/Ca in shells. Here, more attentions should be paid to the constraint of authigenic mineral precipitation processes on the trace elements in ostracod shells and to the correlation between these trace elements in biogenic carbonates and compositions of the sediments in systems and in future in vitro experiments.

关键词： ostracod shell molar Sr/Ca ratio molar Mg/Ca ratio environmental response Heqing Basin

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Sedimentary cycles of trace elements in Salawusu River Valley since 150 ka BP

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Journal of Geographical sciences 2002年第1期12卷 65-71页

作者： YAO Chun-xia1,2. LI Bao-sheng1,2. jin He-ling3, David Dian {2.4, YAN Man-cun5, Zhu Yi-zhi2. LI Hou-xin1, {2. Yu-hong1, Luo Kai-li1 (1. Dept. of Geography, South China Normal University, {2.zhou 510631, China 2. state key laboratory of loess Dept. of Geography South China Normal University Guangzhou 510631 Cold and Arid Regions environmental and Engineering Research institute CAS Lanzhou 730000 Dept. of Geography and geology Hong Kong University 香港 Dept. of Hydraulic Engineering Tsinghua University 北京 100084 institute of earth {2. CAS State Key Laboratory of Loess and Quarternary GeologyCAS Xi'an 710061

The paper makes some analyses on 11 trace elements in the Milanggouwan stratigraphical section in the Salawusu River valley, which is regarded as a prototype geology-palaeoclimate record since 150 ka BP. The results show that the content and variation of trace elements has experienced remarkably regular changes in the pace with coarse and fine sedimentary cycles of palaeo-aeolian sands to its overlying fluvio-lacustrine facies or/and palaeosols. The trace elements with chemical properties of relatively active (V, Sr, Cu, Ni, As) and relatively stable (P, Pb, Rb, Mn, Nb, Zr) are a manifestation of the corresponding 2. changeable cycles between peak and valley values, appearing a multi-fiuctuational process line of relative gathering and migration since then. The low numerical value distribution of these two types of trace elements in the aeolian sand facies represents erosion and accumulation under wind force during the cold-dry climate. Whereas their enrichments in both fluvio-lacustrine facies and palaeosols are related to the valley’s special low-lying physiognomic position between the Ordos Plateau and the loess Plateau under the warm and {2.mid climate conditions. The above relatively migrated and gathered change of the trace elements is the result of 2. climatic cycles of cold-dry and warm-{2.mid, which is probably caused by repeated alternations of winter monsoon and summer monsoon in the Mu Us Sandy Land influenced by the climate vicissitudes in northern hemisphere during glacial and interglacial periods since 150 ka BP.

关键词： Salawusu River valley Milanggouwan section cycle trace elements 150 ka BP palaeoclimate

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CSCO_3 CYCLES IN SALAWUSU RIVER BASINSINCE 150KA B.P.

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chinese Geographical Science 2001年第4期11卷 50-56页

作者： LUO Kai-li1,2. LI Bao-sheng1,2. Zhu Yi-zhi2. jin He-ling3, {2. David Dian4, YAN Man-cun5, LI Hou-xin1, YAO Chun-xia1, {2. Yu-hong1f 1. Department of Geography, South China Normal University, {2.zhou 510631, P. R. China 2. state key Labor

ABSTRACT: This paper, with Milanggouwan stratigraphic section as a typical section of the Salawusu River Basin, explores the relation between CaCO3 content distribution and climate change since 150 ka B. P. and concludes that: 1) The low-high changes of CaCO3 content in the section has a remarkable corresponding relation with the sedimentary cycles of ancient aeolian sand and overlying fluviolacustrine facies or palaeosols. 2. CaCO3 distribution in aeolian sand is relatively meagre, ranging from 0. 8% - 7. 18%, or on an average 2. 50% but relatively enriches in the fluviolacustrine faceis and palaeosols, ranging from 2. 2.% - 14. 9% , or on an average 5. 74%. This implies that they have different climatic backgrounds. The former was the product of erosion, transport and deposition by wind under arid and cold climatic conditions, whereas the latter was related to its special low-lying geomorphic position between the Ordos Plateau and loess Plateau and warm-humid climatic {2.. When the climatic became warm and humid, fluviolacustrine and swamp facies developed, soil-forming action strengthened, and low-lying catchment condition was favorable to CaCO3 accumulation. 3) The basic cause responsible for the multicycle of CaCO3 migration and accumulation in the Milanggouwan section may be the multiple alterations of winter and summer monsoons over the Mu Us Desert under the influences of climatic fluctuation of glacial and interglacial periods in the Northern Hemisphere since 150ka B. P. .

关键词： Milanggouwan section 150ka B. P. CaCO3, 2. sediment-climatic cycles

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Progress in quantitative research on the relationship between atmospheric oxidation and air quality

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Journal of environmental sciences 2023年第1期123卷 350-366页

作者： Yuesi Wang xin jin Zirui Liu Gehui Wang Guiqian Tang Keding Lu Bo hu Shanshan Wang Guohui Li xinqin An Chao Wang Qihou hu Lingyan He Fenfen zhang Yuanhang zhang state key {2. of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China 3 State Key Joint Laboratory or Environmental Simul ation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China state key Joint {2. of {2.al Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China key Lab of Geophysical Information System of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Shanghai key laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 201203China key Lab of Aerosol Chemistry and Physics State Key Laboratory of Loess and Quaternary GeologyInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China institute of Atmospheric Composition and environmental Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China key Lab of environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

Atmospheric oxidizing capacity(AOC)is an essential driving force of troposphere chemistry and self-cleaning,but the definition of AOC and its quantitative representation remain *** by national demand for air pollution control in recent years,chinese scholars have carried out studies on theories of atmospheric chemistry and have made considerable progress in AOC *** paper will give a brief review of these ***,AOC indexes were established that represent apparent atmospheric oxidizing ability(AOIe)and potential atmospheric oxidizing ability(AOIp)based on aspects of macrothermodynamics and microdynamics,respectively.A closed study refined the quantitative contributions of heterogeneous chemistry to AOC in Beijing,and these AOC methods were further applied in Beijing-Tianjin-Hebei and key areas across the *** addition,the detection of ground or vertical profiles for atmospheric OH·,HO_(2.·,NO_(3)·radicals and reservoir molecules can now be obtained with domestic instruments in diverse ***,laboratory smoke chamber simulations revealed heterogeneous processes involving reactions of O_(3)and NO_(2.,which are typical oxidants in the surface/interface atmosphere,and the evolutionary and budgetary implications of atmospheric oxidants reacting under multispecies,multiphase and multi-interface conditions were ***,based on the GRAPES-CUACE adjoint model improved by chinese scholars,simulations of key substances affecting atmospheric oxidation and secondary organic and inorganic aerosol formation have been *** numerical simulations of AOIe and AOIp were performed,and regional coordination of AOC was *** optimized plan for controlling O_(3)and PM2.5was analyzed by scenario simulation.

关键词： Atmospheric oxidizing capacity(AOC) Quantitative index Free radicals Observation and modeling Air quality

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藏南冰前湖枪勇错近百年沉积速率变化及冰川进退反演

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湖泊科学 2021年第5期33卷 1584-1594页

作者：张润金章东张飞张小龙李良波徐阳徐柏青中国科学院地球环境研究所黄土与第四纪地质国家重点实验室西安710061 中国科学院大学北京100049 中国科学院第四纪科学与全球变化卓越创新中心西安710061 中国科学院青藏高原研究所青藏高原环境变化与地表过程重点实验室北京100101 中国科学院青藏高原地球科学卓越创新中心北京100101

青藏高原上分布着大量的大陆性冰川,其对区域及全球气候变化响应极其敏感.工业革命以来,随着全球升温速率加快(特别是北半球),青藏高原部分地区的冰川在近百年显著退缩.冰前湖沉积物是最直接的冰川变化记录载体之一,但其沉积速率如何响... 详细信息

青藏高原上分布着大量的大陆性冰川,其对区域及全球气候变化响应极其敏感.工业革命以来,随着全球升温速率加快(特别是北半球),青藏高原部分地区的冰川在近百年显著退缩.冰前湖沉积物是最直接的冰川变化记录载体之一,但其沉积速率如何响应冰川及气候变化,能否反演冰川进退过程却知之甚少.本文依据^(2.0)Pb和^(137)Cs限定藏南冰前湖枪勇错QY5沉积岩芯的年龄,计算出不同深度沉积物的沉积速率,且与前人(QY-3)的沉积速率进行对比,揭示了近百年来枪勇错流域冰川变化历史及其与气温之间的关系.结果表明,枪勇错QY5近百年来的平均沉积速率为0.2. cm/a,比湖心(QY-3)快2.左右,但两者的变化基本同步,高沉积速率对应温度上升期,是冰川退缩的直接响应:(1)1900-1960年,枪勇错沉积速率整体增加且变幅较大,与1890-1950年之间西藏温度波动式升高相对应,反映枪勇冰川总体处于退缩状态;(2.1960-1985年,沉积速率低且变幅较小,同期气温下降,枪勇冰川退缩程度相对较低且保持平稳;(3)1985年以来,枪勇错沉积速率呈上升趋势,是全球增暖下冰川显著退缩的直接响应.在短时间尺度内冰前湖沉积速率所揭示的枪勇冰川变化主要受控于温度,降水量对冰川变化的影响较小,但冰川对温度变化的响应滞后5~10 a.由于全球变暖和冰川对温度响应的滞后,在未来几十年高原冰川的融化速率可能会加快,亚洲水塔将面临着新的挑战.

关键词：沉积速率 2.0 Pb和137 Cs测年冰川变化全球变暖冰前湖枪勇错

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Soil quality assessment in different dammed-valley farmlands in the hilly-gully mountain areas of the northern loess Plateau,China

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Journal of Arid Land 2021年第8期13卷 777-789页

作者： CHEN Shumin jin Zhao {2. jing YANG Siqi state key {2. of {2. and quaternary geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China University of chinese academy of sciences Beijing 100049China CAS Center for Excellence in quaternary Science and Global Change Xi'an 710061China xi'an institute of earth environment Innovation Xi'an 710061China Interdisciplinary Research Center of earth Science Frontier(IRCESF) Beijing Normal UniversityBeijing 100875China

There are numerous valley farmlands on the chinese loess Plateau(CLP),where suffers from low soil quality and high risk of soil salinization due to the shallow groundwater table and poor drainage ***,research on the evolution processes and mechanisms of soil quality and salinization in these dammed-valley farmlands on the CLP is still inadequately *** this study,three kinds of dammed-valley farmlands in the hilly-gully areas of the northern CLP were selected,and the status of soil quality and the impact factors of soil salinization were *** dammed-valley farmlands include the new farmland created by the project of Gully Land Consolidation,the 60-a farmland created by sedimentation from check dam,and the 400-a farmland created by sedimentation from an ancient landslide-dammed *** showed that(1)the newly created farmland had the lowest soil quality in terms of soil bulk density,porosity,soil organic carbon and total nitrogen among the three kinds of dammed-valley farmlands;(2.soil salinization occurred in the middle and upper reaches of the new and 60-a valley farmlands,whereas no soil salinization was found in the 400-a valley farmland;and(3)soil salinization and low soil nutrient were determined to be the two important factors that impacted the soil quality of the valley farmlands in the hilly-gully mountain areas of the *** conclude that the dammed-valley farmlands on the CLP have a high risk of soil salinization due to the shallow groundwater table,alkalinity of the loessial soil and local landform feature,thus resulting in the low soil quality of the valley ***,strengthening drainage and decreasing groundwater table are extremely important to improve the soil quality of the valley farmlands and guarantee the sustainable development of the valley agriculture on the CLP.

关键词： dammed-valley farmland soil quality soil salinization groundwater chinese loess Plateau

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East Asian Winter Monsoon record from the environmental sensitive grain size component of QF Old Red Sand, Haitan Island, China

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Research in Cold and Arid Regions 2013年第2期5卷 220-229页

作者： FanGen hu ZhiZhong Li Jianhui {2. Qian Zhao hui zhang xianLi Wang {2.g xia College of Geographical Science Fujian Normal University key laboratory of {2.mid Sub-tropical Eco-geographical Process of Ministry of Education state key {2. of {2. and quaternary geology Institute of Earth Environment Chinese Academy of Sciences institute of Geography Fujian Normal University

The ＂Old Red Sand＂ is widely distributed along the coast of Fujian Province, China. Most studies have been carried out from as- pects of the origin, age and laterization of the ＂Old Red Sand＂, but this paper focused on reconstructing the history of the Asian Winter Monsoon change. On the basis of granulometric analysis of high-resohition samples, we have obtained environmental sen- sitive grain size component （ESGSC） from the Qingfeng （QF） profile by using the grain size-standard deviation method, which proves that the selected ESGSC is an important climate proxy. The mean grain size of this ESGSC could be used to reconstruct the East Asian Winter Monsoon （EAWM） intensity. As such, the history of the EAWM change since 44.0 ka reconstructed here reveals three main phases based on chronology dates of previous researches：（1） 44.0-2..5 ka B.P., the EAWM is relatively weak but increases gradually with fluctuations; （2. 2..5-15.5 ka B.P., relatively strong with high frequency fluctuations; （3） 15.5-7.1 ka B.P., with a weaker winter monsoon, but during 11-10 ka B.P. is remarkably enhanced. The EAWM recorded by mean grain size of the two neighboring sections have a better repeatability, so the millennial scales oscillation should be a reliable signal of the EAWM intensity. The climate recorded by ESGSC of the QF ＂Old Red Sand＂ compared to 6-80 of huhi Cave stalagmites and Greenland GISP2.ice cores shows a good consistency, especially in detail, the YD event and four Heinrich events are all recorded, but the signal of D-O cycles was relatively weak.

关键词： Old Red Sand sensitive grain size East Asian Winter Monsoon Heinrich event

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帕米尔高原冰川流域碎屑颗粒的铀同位素组成及其对沉积物搬运的指示

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地球环境学报 2019年第2期10卷 116-127页

作者：徐阳张飞金章东中国科学院地球环境研究所黄土与第四纪地质国家重点实验室西安710061 中国科学院大学北京100049 西安交通大学全球环境变化研究院西安710049

铀(U)同位素作为一种新的地球化学示踪手段,被逐渐用于研究陆地和海洋沉积物的搬运过程。然而,这一新技术能否有效指示不同环境中各类沉积物的搬运还需更多流域数据的支持。本文选取位于帕米尔高原东北部具有显著海拔梯度和气候差异的... 详细信息

铀(U)同位素作为一种新的地球化学示踪手段,被逐渐用于研究陆地和海洋沉积物的搬运过程。然而,这一新技术能否有效指示不同环境中各类沉积物的搬运还需更多流域数据的支持。本文选取位于帕米尔高原东北部具有显著海拔梯度和气候差异的盖孜河冰川流域作为研究对象,通过该流域河流沉积物细颗粒中的U同位素的活度比((^(2.4)U/^(2.8)U)_(AR))的空间变化,探索U同位素指示内陆冰川流域沉积物搬运的可行性。流域内河流沉积物的矿物组成以石英和长石(占51%—77%)为主,表明较弱的风化作用。流域内受冰川侵蚀控制的上游山区支流康西瓦河和木吉河沉积物的(^(2.4)U/^(2.8)U)_(AR)范围分别是0.990—1.017和0.988—1.009,盖孜河中下游段河流沉积物的(^(2.4)U/^(2.8)U)_(AR)则为0.913—0.997。从上游山区至中下游段显示了一个明显的下降趋势,指示了沉积物搬运过程中(^(2.4)U/^(2.8)U)_(AR)的确发生了系统的变化。然而,盖孜河流域碎屑颗粒比表面积和分形维数计算得到的反冲损失参数太低,未能利用U同位素破碎年龄模型获得合理的沉积物搬运时间,该模型如何用到冰川流域尚需更多的研究工作。

关键词：冰川流域河流沉积物 2.4U/2.8U活度比破碎年龄模型搬运时间

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Ammonia in urban atmosphere can be substantially reduced by vehicle emission control:A case study in Shanghai, China

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Journal of environmental sciences 2023年第4期126卷 754-760页

作者： Can Wu Shaojun Lv Fanglin Wang xiaodi Liu jin Li Lang Liu Si zhang Wei Du Shijie Liu Fan zhang Jianjun Li jingjing Meng Gehui Wang key Lab of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200062China institute for environmental and Climate Research Jinan UniversityGuangzhou 511443China School of Public Policy and Administration Northwestern Polytechnical UniversityXi’an 710061China state key {2. of {2. and quaternary geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China School of environment and Planning Liaocheng UniversityLiaocheng 252000China institute of Eco-Chongming Chenjia ZhenChongmingShanghai 202162China

To investigate the impact of emission controls on ammonia(NH_(3)) pollution in urban atmosphere, observation on NH_(3)(1 hr interval) was performed in Shanghai before, during and after the 2.19 China International Import Expo (CIIE) event, along with measurements on inorganic ions, organic tracers and stable nitrogen isotope compositions of ammonium in PM_(2.5). NH_(3)during the CIIE period was 6.5±1.0μg/m^(3), which is 41% and 32. lower than that before and after the event, respectively. Such a decrease was largely ascribed to the emission controls in nonagricultural sources, of which contribution for measured NH_(3)in control phase abated by ~2.% compared to that during uncontrol period. Molecular compositions of PAHs and hopanes further suggested a dominant role of the reduced vehicle emissions in the urban NH_(3)abatement during the CIIE period. Our results revealed that vehicle exhaust emission control is an effective way to mitigate NH_(3)pollution and improve air quality in chinese urban areas.

关键词： Ammonia Non-agricultural sources Vehicle emission stable nitrogen isotope Organic tracers

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Assessing Soil Erosion Rates on Manually-Tilled Hillslopes in the Sichuan Hilly Basin Using ^(137)Cs and ^(2.0)Pb_(ex) Measurements

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Pedosphere 2007年第3期17卷 273-283页

作者： ZHENG jin-Jun HE xiu-Bin D. WALLING zhang xin-Bao D. FLANAGAN QI Yong- Qing institute of Mountain Hazards and environment Chinese Academy of Sciences Chengdu 610041 （China） Graduate University of the chinese academy of sciences Beijing 100049 （China） Department of Geography University of Exeter Exeter EX4 4RJ （UK） state key {2. of {2. and quaternary geology Institute of Earth Environment Chinese Academy of SciencesXi＇an 710075 （China） USDA-ARS National Soil Erosion Research laboratory West Lafayette Indiana 47907 （USA） institute of Geographical sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101（China）

Purple soils are widely distributed in the Sichuan Hilly Basin and are highly susceptible to erosion, especially on the cultivated slopes. Quantitative assessment of the erosion rates is, however, difficult due to small size of the plots of the manually-tilled land, the complex land use, and steep hillslopes. ^137Cs and ^2.0Pbex （excess ^2.0Pb） tracing techniques were used to investigate the spatial pattern of soil erosion rates associated with slope-land under hoe tillage in Neijiang of the Sichuan Hilly Basin. The ^137Cs and ^2.0Pbex inventories at the top of the cultivated slope were extremely low, and the highest inventories were found at the bottom of the cultivated slope. By combining the erosion rates estimates provided by both ^137Cs and 2.~Pbex measurements, the weighted mean net soil loss from the study slope was estimated to be 3 100 t km^-2.year^-1, which was significantly less than 6 930 t km^-2.year^-1 reported for runoff plots on a 10° cultivated slope at the Suining Station of Soil Erosion. The spatial pattern of soil erosion rates on the steep agricultural land showed that hoe tillage played an important role in soil redistribution along the slope. Also, traditional farming practices had a significant role in reducing soil loss, leading to a lower net erosion rate for the field.

关键词： ^137Cs hoe tillage, ^2.0Pbex purple soil soil erosion

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