Article
Engineering, Environmental
Ruoyu Sun, Holger Hintelmann, Johan A. Wiklund, Marlene S. Evans, Derek Muir, Jane L. Kirk
Summary: This study measured mercury isotope compositions in sediment cores to investigate the relationship between mercury emission sources and deposition in lakes. The results show the significant influence of legacy mercury remobilization on mercury transport in ecosystems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Tyler J. Harrow-Lyle, Wai Ying Lam, Erik J. S. Emilson, Robert W. Mackereth, Carl P. J. Mitchell, Stephanie J. Melles
Summary: Methyl mercury (MeHg) concentrations in boreal headwater streams in Ontario, Canada are influenced by natural processes and disturbances such as forestry management. This study used a structural equation modelling approach to assess the impact of catchment characteristics and stream water chemistry on MeHg concentrations in the Dryden - Wabigoon Forest region. The results identified nitrate concentrations, water temperature, and latent watershed characteristics as important drivers of MeHg concentrations. Two plausible pathways for MeHg concentration were described: indirect effect of forest-derived nutrients increasing in-situ MeHg production, and direct supply of MeHg from inundated soils following precipitation and inundation events.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Wolfgang Jansen
Summary: This study measured total mercury concentrations in lake sturgeon from five river systems in Manitoba, Canada. The concentrations were positively related to fish length and age, and the composition of fish diet was found to affect mercury concentrations. The study suggests that as lake sturgeon populations recover and harvest rates potentially increase, consumption of larger individuals should be limited.
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
(2023)
Article
Engineering, Environmental
Tianhang Li, Wei Zhong, Zhiqiang Wei, Shengtan Shang, Susu Ye, Yuanhan Chen, Junyu Pan, Xiaojun Wang
Summary: The new Pb-210-dated record of Hg accumulation in the Huguangyan Lake (HGY) sediment core from a Hg-enriched area in South China suggests that atmospheric deposition is the main source of Hg influx into the lake, with minimal input from the catchment and limited adsorption effects of organic matter and clay. Enhanced anthropogenic input of Hg began in the early 1900s, correlating with wars or increased economic activities in China. The HGY sediments serve as a valuable natural archive for studying atmospheric Hg deposition related to human activities.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Ecology
M. W. Swinton, P. K. Myer, M. F. Schaller, E. A. Pettitt, J. L. Farrell, S. A. Nierzwicki-Bauer
Summary: This study investigated mercury bioavailability in streams entering Lake George. Biomagnification rates explained a high percentage of variation in MeHg concentrations within the stream food web. Stream order was negatively related to basin slope and explained most of the variation in predatory macroinvertebrate MeHg concentrations. Methylmercury concentrations were negatively related to delta C-13 in basal resources. Shallow slopes elevated MeHg in basal resources and had minimal influence on variation in predator MeHg concentrations.
Article
Environmental Sciences
Karista Hudelson, Derek C. G. Muir, Guenter Koeck, Xiaowa Wang, Jane L. Kirk, Igor Lehnherr
Summary: Lake Hazen, the largest lake north of the Arctic circle, is experiencing mercury pollution and climate change. The sensitive Arctic char inhabiting the lake has shown significant declines in mercury concentrations over the past 31 years, with increased rainfall and earlier freeze-up of lake ice being linked to increased age and length of the fish.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Ilona Sekudewicz, Michal Gasiorowski
Summary: The research revealed a negative correlation between Cs-137 activity concentrations and sediment grain size, with significant amounts of Cs-137 detected in the deeper parts of the lake bottom. Turawa Lake may serve as a significant trap for Cs-137 polluted sediments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Water Resources
Tessa Bermarija, Lindsay Johnston, Chris Greene, Barret Kurylyk, Rob Jamieson
Summary: Study region: Halifax, Nova Scotia, Canada. Study focus: Many lakes in the Halifax region are facing the issue of elevated chloride (Cl-) levels due to deicing salt application. In this study, geospatial analysis and linear regression methods were used to identify the main contributing factors to high Cl- concentrations in lakes. A mass balance model was also developed to estimate Cl- loading rates for different land use categories. The findings provide new hydrological insights for the region and support predictive modeling for future development impacts.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Astronomy & Astrophysics
Kaj Sand-Jensen, Tenna Riis, Johan Emil Kjaer, Kenneth Thoro Martinsen
Summary: Streams in cultivated lowlands are often saturated with CO2, but the concentrations decrease downstream with rising water temperature, chlorophyll a concentration, and decreasing groundwater inputs. CO2 concentrations at the outlet of lakes can be reduced due to phytoplankton uptake and atmospheric loss. Plant uptake of CO2 is observed to occur in summer and in the afternoons. Sites with deeper water and low gas transfer velocity retain high CO2 concentrations. The variation in CO2 emission rates in fluvial networks is influenced by various physical, chemical and biological processes.
EARTH AND SPACE SCIENCE
(2022)
Article
Environmental Sciences
Sarah A. M. Nelson, Holger Hintelmann, Julian Aherne
Summary: Mercury concentrations in the atmosphere, surface waters, and soils have increased beyond natural levels due to human activities. This study investigated the interlinkages between mercury concentrations in soils, lake sediment, and lake water in remote upland acid-sensitive catchments. The results suggest that catchment soils are the main driver of variation in mercury concentrations in lake water and sediment in upland regions in Ireland.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Environmental Sciences
Hailei Su, Di Shi, Jiwei Yang, Yanru Tao, Fuhong Sun, Yuan Wei
Summary: The study revealed that mercury concentrations in sediments from Taihu Lake were relatively high, posing a moderate ecological risk level. This highlights the importance of strengthening monitoring and management to mitigate the impacts of mercury pollution.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Environmental Sciences
Xiaodan Zhang, Lumin Sun, Xianxu Huang, Jingting Zhuang, Zhenbin Gong, Dongxing Yuan
Summary: The concentrations and isotopic compositions of mercury in the Jiulong River Estuary were investigated. The study found that there were no significant differences in mercury concentrations between dry and wet seasons in both surface water and sediment. However, large variations in Hg isotopic compositions were observed. Soil erosion was identified as the major source of mercury in surface sediment, while precipitation and natural soil were the main sources in surface water. Additionally, underground water and industrial and urban waste also contributed to mercury pollution in surface water, and atmospheric dry deposition was another source.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Geography, Physical
Johannes Hardeng, Jostein Bakke, Pierre Sabatier, Eivind Wilhelm Nagel Storen, Willem Van der Bilt
Summary: River flood hazards have increased worldwide due to human encroachment and global climate change. A study in Norway investigated lake sediments to reconstruct flood events over the past 8000 years, revealing two different flood regimes triggered by rainfall and snowmelt. Comparisons with paleoclimate reconstructions showed a shift towards more snowmelt-triggered floods in the late Holocene, following a period dominated by extreme precipitation-triggered floods.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Qingru Wu, Yi Tang, Long Wang, Shuxiao Wang, Deming Han, Daiwei Ouyang, Yueqi Jiang, Peng Xu, Zhigang Xue, Jingnan Hu
Summary: The study found that lockdown measures and unfavorable meteorological conditions impact anthropogenic mercury emissions and atmospheric mercury concentration. Mercury emissions and concentration in the atmosphere decreased by approximately 16.7 kg/day and 0.10 ng/m(3) respectively during the lockdown period, while changes in meteorology increased atmospheric mercury by 0.41 ng/m(3).
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Jose G. Dorea, Lucas Cabrera Monteiro, Jose Vicente Elias Bernardi, Iara Oliveira Fernandes, Sandy Flora Barbosa Oliveira, Joao Pedro Rudrigues de Souza, Ygor Oliveira Sarmento Rodrigues, Ludgero Cardoso Galli Vieira, Jurandir Rodrigues de Souza
Summary: Freshwater ecosystems are crucial for human and wildlife survival, but anthropogenic activities have led to mercury pollution in the Brazilian Savanna ecosystem. The study found that increased land use intensity may result in an accumulation of mercury in sediments and macrophytes over a short period of time.
ENVIRONMENTAL POLLUTION
(2023)
