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Sedimentary records of contaminant inputs in Frobisher Bay,nunavut

Environmental Science and Ecotechnology 2024年第2期18卷 28-42页

作者： Meaghan C.Bartley Tommy Tremblay Amila O.De Silva C.Michelle Kamula Stephen Ciastek Zou Zou A.Kuzyk Centre for Earth Observation Science Clayton H.Riddell Faculty of EnvironmentEarth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada Department of Environment and Geography Clayton H.Riddell Faculty of EnvironmentEarth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada canada-nunavut geoscience office IqaluitNunavutX0A 0H0Canada Environment and Climate Change canada BurlingtonOntarioL7S 1A1Canada Department of Earth Sciences Clayton H.Riddell Faculty of EnvironmentEarth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada

Contaminants,such as polychlorinated biphenyls(PCBs),polycyclic aromatic hydrocarbons(PAHs),heavy metals,and per and polyfluoroalkyl substances(PFASs),primarily reach the Arctic through long-range atmospheric and oceanic ***,local sources within the Arctic also contribute to the levels observed in the environment,including legacy sources and new sources that arise from activities associated with increasing commercial and industrial *** City of Iqaluit in Frobisher Bay,nunavut(canada),has seen rapid population growth and associated development during recent decades yet remains a site of interest for ocean protection,where Inuit continue to harvest country *** the present study,seven dated marine sediment cores collected in Koojesse Inlet near Iqaluit,and from sites in inner and outer Frobisher Bay,respectively,were analyzed for total mercury(THg),major and trace elements,PAHs,PCBs,and *** sedimentary record in Koojesse Inlet shows a period of Aroclor 1260-like PCB input concurrent with military site presence in the 1950e60s,followed by decades of input of pyrogenic PAHs,averaging about ten times background ***-surface sediments in Koojesse Inlet also show evidence of transient local-source inputs of THg and PFASs,and recycling or continued slow release of PCBs from legacy land-based *** in PFAS congener composition clearly distinguish the local sources from long-range *** Koojesse Inlet but still in inner Frobisher Bay,9.2 km from Iqaluit,sediments showed evidence of both local source(PCB)and longrange *** outer Frobisher Bay,an up-core increase in THg and PFASs in sediments may be explained by ongoing inputs of these contaminants from long-range *** context for ocean protection and country food harvesting in this region of the Arctic clearly involves both local sources and long-range transport,with past human activities leaving a long legacy insofar as levels of persistent o

关键词： Arctic sediments Mercury Polycyclic aromatic hydrocarbons(PAHs) Polychlorinated biphenyls(PCBs) Per and polyfluoroalkyl substances(PFASs) Persistent organic pollutants(POPs)

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Climate change and groundwater conditions in the Mekong Region–A review

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Journal of Groundwater Science and Engineering 2017年第1期5卷 14-30页

作者： Ramasamy Jayakumar Eunhee Lee UNESCO Bangkok office Bangkok Thailand Groundwater Department Korea Institute of Geoscience and Mineral Resources (KIGAM)

Changes in the climatic system introduce uncertainties in the supply and management of water resources. The Intergovernmental Panel on Climate Change(IPCC) predicts an increase of 2 to 4 °C over the next 100 years. Temperature increases will impact the hydrologic cycle by directly increasing the evaporation of surface water sources. Consequently, changes in precipitation will indirectly impact the flux and storage of water in surface and subsurface reservoirs(i.e., lakes, soil moisture, groundwater, etc.). In addition, increases in temperature contribute to increases in the sea level, which may lead to sea water intrusions, water quality deterioration, potable water shortages, etc. Climate change has direct impacts on the surface water and the control of storage in rivers, lakes and reservoirs, which indirectly controls the groundwater recharge process. The main and direct impact of climate change on groundwater is changes in the volume and distribution of groundwater recharge. The impact of climate change on groundwater resources requires reliable forecasting of changes in the major climatic variables and accurate estimations of groundwater recharge. A number of Global Climate Models(GCMs) are available for understanding climate and projecting climate *** GCMs can be downscaled to a basin scale, and when they are coupled with relevant hydrological models, the output of these coupled models can be used to quantify the groundwater recharge, which will facilitate the adoption of appropriate adaptation strategies under the impact of climate change.

关键词： Climate change Groundwater Mekong Region

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Conodont Biostratigraphy of Ordovician Deep-Water Turbiditic Sequences in Eastern Australia——A New Biozonal Scheme for the Open-Sea Realm

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Journal of Earth Science 2021年第3期32卷 486-500页

作者： Yong Yi Zhen Ian G.Percival Phil Gilmore Jodie Rutledge Liann Deyssing W.B.Clarke geoscience Centre Geological Survey of New South WalesLondonderry NSW 2753Australia Head office Geological Survey of New South WalesMaitland NSW 2320Australia Regional office Geological Survey of New South WalesOrange NSW 2800Australia

Ordovician conodonts representing 28 genera and 28 named and three unnamed species were identified from 740 chert and siliceous siltstone spot samples(>3000 thin sections)from deep-water turbiditic sequences of the Lachlan Orogen in central and southern New South Wales,*** on these faunas,a new conodont biozonal scheme has been established to divide the Ordovician turbiditic successions of the Lachlan Orogen into 12 superbiozones and *** are(in ascending order)the Paracordylodus gracilis Superbiozone(including the Prioniodus oepiki Biozone),Periodon flabellum Superbiozone(including the Oepikodus evae Biozone in the lower part),Periodon hankensis Biozone,Periodon aculeatus Superbiozone(including the Histiodella labiosa,Histiodella holodentata,Histiodella kristinae,Pygodus serra and Pygodus anserinus biozones)and the Periodon grandis *** Pygodus anserinus Biozone is divided further into the lower and upper *** new conodont biozonation scheme spanning the upper Tremadocian to middle Katian interval permits precise age-dating and correlation of deep-water siliciclastic rocks that characterize the Ordovician Deep-Sea Realm regionally and internationally.

关键词： conodonta Ordovician System correlation deep-water biofacies paleobiogeography

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Representation of the ENSO Combination Mode and its Asymmetric SST Response in Different Resolutions of HadGEM3

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Advances in Atmospheric Sciences 2018年第8期35卷 167-180页

作者： Jianghua WAN Hongli REN Peili WU Laboratory for Climate Studies and CMA-NJU Joint Laboratory for Climate Prediction Studies National Climate Center China Meteorological Administration Beijing 100081 China Department of Atmospheric Sciences School of Environment Studies University of Geoscience Wuhan 430074 China Met office Hadley Center Exeter EX1 3PB UK

Previous studies have revealed a combination mode （C-mode） occurring in the Indo-Pacific region, arising from nonlinear interactions between ENSO and the western Pacific warm pool annual cycle. This paper evaluates the simulation of this C-mode and its asymmetric SST response in HadGEM3 and its resolution sensitivity using three sets of simulations at horizontal resolutions of N96, N216 and N512. The results show that HadGEM3 can capture well the spatial pattern of the C-mode associated surface wind anomalies, as well as the asymmetric response of SST in the tropical Pacific, but it strongly overestimates the explained variability of the C-mode compared to the ENSO mode. The model with the three resolutions is able to reproduce the distinct spectral peaks of the C-mode at the near annual combination frequencies, but the performance in simulating the longer periods is not satisfactory, presumably due to the unrealistic simulation of the ENSO mode. Increasing the horizontal resolution can improve the consistency between atmospheric and oceanic representations of the C-mode, but not necessarily enhance the accuracy of C-mode simulation compared with observation.

关键词： ENSO combination mode asymmetric response Nifio-A index HadGEM3 horizontal resolution

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关于“洋脊俯冲作用运动学及其对地幔上涌作用性质指示意义”的讨论

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地质科学译丛 1995年第3期12卷 21-23页

作者： Derek J.Thorkelson 张春福 canada-Yukon geoscience office Box 2703. Whitehorsc YI YIA 2C6. Canada

0 引言 ***和***在最近一篇关于“洋脊俯冲作用”论文中,讨论了被淹海底扩张中心的构造、岩浆作用问题。他们的论文汇集了几个洋脊-海沟碰撞带的有用的信息,并且阐明了一种所谓“离析作用”(eduction)的板块作用类型。但是,他们的分析... 详细信息

0 引言 ***和***在最近一篇关于“洋脊俯冲作用”论文中,讨论了被淹海底扩张中心的构造、岩浆作用问题。他们的论文汇集了几个洋脊-海沟碰撞带的有用的信息,并且阐明了一种所谓“离析作用”(eduction)的板块作用类型。但是,他们的分析存在许多缺陷,因为他们:(1)没有考虑俯冲板块和介于其间的板块窗口的几何形状;(2)没有正确表达板块窗口对仰冲板块中的构造、岩浆作用和对地幔流的重要性;(3)不正确地把板块窗口形成的概念和“

关键词：洋脊俯冲作用运动学地幔上涌作用地幔流

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Fluid inclusion characteristics of Longmenshan copper-polymetallic deposit in Yueshan,Anhui Province,China

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Journal of Central South University 2012年第9期19卷 2627-2633页

作者：刘忠法邵拥军疏志明彭南海谢友良张宇 School of geoscience and Info-Physics Central South University Tongling Nonferrous Metals Grou p Co. Ltd.

The types, composition and physico-chemical conditions of primary fluid inclusions were researched. The results show that the primary fluid inclusions contain vapor and liquid phase type （Type I）, daughter mineral-bearing type （Type II） and pure liquid phase type （Type III）. The compositions of vapor are mainly H20 and CO2 with a tiny amounts of CH4 and H2; the liquid phase mainly contains Mg2＋, Ca2＋, Na＋, K＋, CI- and SO]-, and w（Na＋）/w（K＋）〉l; the homogenization temperatures of the primary fluid inclusions can be divided into 190-250 ℃, 250-340 ℃ and 360-420 ℃, corresponding to the salinities of 4%-9%, 9%-14%, and 14%-20.43% （NaC1 equivalent mass fraction）, respectively. The mineralization process can be divided into three episodes： the silicatization stage, the quartz-sulfide stage, and the carbonatization stage, and all of them are associated with the ore-forming hydrothermal fluid activity. The origin of the hydrothermal fluid is from magrnatic water mainly, and later it mixes with the groundwater and meteoric water, which lead to the decrease of temperature and salinity. The decrease of salinity, temperature and pressure are the main causes of the metallogenic elements unloading and enriching in the favorable position.

关键词： fluid inclusions metallogenic physico-chemical condition ore-forming fluid Longmenshan copper-polymetallic deposit

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Promoting high-level cooperation in geosciences and assisting high-quality development of mining:“Belt and Road” Forum for International geoscience Cooperation and Mining Investment was held in Xi’an, China

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China Geology 2019年第3期2卷 400-402页

作者： China Geology Editorial office China Geology Editorial office

The China-Shanghai Cooperation Organization (SCO) geosciences Cooperation Research Center (also referred to as the “Center ”) was established in 2014 and consists of eight member states. The office is located at the Xi ’an Center of China Geological Survey (Xi ’an). The Center is an open geoscience research organization and devotes to the cooperation and exchanges in the field of geosciences with the relevant states of the SCO, promoting the mining economic development, sharing geology and mineral information and training personnel.

关键词： was office SCO is

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Indian Ocean SST modes and Their Impacts as Simulated in BCC_CSM1.1(m) and HadGEM3

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Advances in Atmospheric Sciences 2018年第8期35卷 139-152页

作者： Bo LU Hong-Li REN Rosie EADE Martin ANDREWS Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China CMA-NJU Joint Laboratory for Climate Prediction Studies Institute for Climate and Global Change Research School of Atmospheric Sciences Nanjing University Nanjing 210023 China Xin Jiang Climate Center Urumqi 830002 China Department of Atmospheric Science School of Environmental Studies China University of Geoscience Wuhan 430074 China Met office Hadley Center Exeter EX1 3PB UK

The sea surface temperature anomalies （SSTAs） in the tropical Indian Ocean （TIO） show two dominant modes at interan- nual time scales, referred to as the Indian Ocean basin mode （IOBM） and dipole mode （IOD）. Recent studies have shown that the IOBM and IOD not only affect the local climate, but also induce remarkable influences in East Asia via teleconnections. In this study, we assess simulations of the IOBM and IOD, as well as their teleconnections, using the operational seasonal pre- diction models from the Met office （HadGEM3） and Beijing Climate Center [BCC_CSMI.I（m）]. It is demonstrated that the spatial patterns and seasonal cycles axe generally reproduced by the control simulations of BCC_CSM1.1 （m） and HadGEM3, although spectra biases exist. The relationship between the TIO SSTA and E1 Nifio is successfully simulated by both mod- els, including the persistent IOBM warming following E1 Nifio and the IOD-E1 Nifio interactions. BCC_CSMI.I（m） and HadGEM3 axe capable of simulating the observed local impact of the IOBM, such as the strengthening of the South Asian high. The influences of the IOBM on Yangtze River rainfall are also captured well by both models, although this teleconnec- tion is slightly weaker in BCC_CSM 1.1 （m） due to the underestimation of the northwestern Pacific subtropical high. The local effect of the IOD on East African rainfall is reproduced by both models. However, the remote control of the IOD on rainfall over southwestern China is not clear in either model. It is shown that the realistic simulations of TIO SST modes and their teleconnections give rise to the source of skillful seasonal predictions over China.

关键词： Indian Ocean SST teleconnection simulation seasonal prediction

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An improved approach for the production of satellite-based geospatialreference imagery

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International Journal of Digital Earth 2008年第2期1卷 221-239页

作者： J.R.Gibson S.Nedelcu canada Centre for Remote Sensing 588 Booth Street OttawaOntarioCanada

An innovative and practical satellite image product is described that is ideal for applications in Northern canada because of its wide area coverage and mappingquality *** product is generated from a new procedure developed at the canada Centre for Remote Sensing(CCRS)for processing Landsat 7 imagery,and by extension,imagery from other Earth Observation *** working with multiple satellite passes,each containing the equivalent of multiple scenes,the new procedure could dramatically reduce the turn-around time for generating georeferenced image products,and also increase their geometric and radiometric accuracy compared to those produced by the current *** objective of the process has been to generate satellite image mosaics covering large areas(e.g.>500000 km^(2))with uniformly distributed errors at sub-pixel *** paper discusses the theoretical basis of a photogrammetric adjustment for satellite imagery and the results obtained from several *** process is generic,involving a sensor model,a satellite orbit model and ground control information;thus it may be easily adapted to any satellite that allows for repeat coverage with overlapping *** performing an adjustment to correct the satellite position and attitude data prior to the production of orthoimage products,it is possible to create a mosaic with a single resampling process which minimises both the radiometric and geometric resampling *** results from three separate tests are presented,along with a discussion of the procedures that were followed in each *** three tests have successfully demonstrated that sub-pixel sample size errors may be consistently obtained over large areas.A by-product process developed to support the measurement of ground control point coordinates for the satellite adjustment was the automatic matching of geographic features such as lakes and islands in vector data *** has been a significant development in that it has e

关键词： satellite imagery photogrammetric geometric accuracy radiometric accuracy large area mosaics automatic registration

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Synchrotron X-ray diffraction study of phenacite at high pressure

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Chinese Physics C 2012年第2期36卷 179-183页

作者： FAN Da-Wei MA Mai-Ning WEI Shu-Yi CHEN Zhi-Qiang XIE Hong-sen Institute of Geochemistry Chinese Academy of SciencesGuiyang 550002China Key Laboratory of Computational Geodynamics Chinese Academy of SciencesBeijing 100049China Graduate University of Chinese Academy of Sciences Beijing 100049China Department of geoscience Stony Brook UniversityNew York 11794USA

We report the results of a natural phenacite from 0 to 30.9 GPa using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at the National Synchrotron Light Source, Brookhaven National Laboratory. Over this pressure range, no phase change or disproportionation has been observed. The isothermal equation of state was determined. The values of V0, K0, and K0 refined with a third-order Birch-Murnaghan equation of state are V0=1116.1：E1.2 -3 K0=2234-9 GPa, and K=5.54-0.8. rthermore, we confirm that the linear compressibilities （/3） along a and c directions of phenacite are elastically isotropic （a=1.50x10-3 and /3c=1.34x10-3 CPa-1）. Consequently, it can be concluded that the compressibility of phenacite under high pressures has been accurately constrained.

关键词： X-ray diffraction high pressure equation of state phenacite

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