Article
Environmental Sciences
Aimei Zhu, Jihua Liu, Shuqing Qiao
Summary: This study quantitatively identified the sources of nine heavy metals in the sediments of the Bohai Sea and found that most metals were below detectable contamination levels. However, Cd and Hg were moderately to significantly enriched, posing potential risks to aquatic ecosystems. Anthropogenic activities and atmospheric deposition were likely the main sources of these two metals.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Mingyu Zhang, Yan Lin, Andy M. Booth, Xikun Song, Yaozong Cui, Bin Xia, Zhangjie Gu, Yifan Li, Fengjiao Liu, Minggang Cai
Summary: This study investigates the fate, sources, and mass budget of microplastics in the Bohai Sea and Yellow Sea. The results show that river discharge and maritime activities are the main pathways for microplastics to enter these seas, and most of the microplastics are deposited in sediments. The study highlights the importance of sedimentary microplastics in preventing further transport to the Pacific Ocean.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Wenting Shi, Min Xu, Qing Liu, Sumei Xie
Summary: This study investigated the pollution status of PAHs in seawater, surface sediment, and marine organisms in Haizhou Bay, China. The main sources of PAHs were found to be coal and biomass combustion in seawater and marine organisms, while traffic was the main source in surface sediment. The cancer risk increment for marine organisms was found to be low. This study provides important insights for understanding the distribution and interrelation of PAHs in other semi-enclosed bays worldwide.
MARINE POLLUTION BULLETIN
(2022)
Article
Marine & Freshwater Biology
Yan Chen, Chun Hu, Gui-Peng Yang, Xian-Chi Gao
Summary: Sedimentary organic matter (SOM) in the South Yellow Sea and East China Sea was analyzed for total organic carbon (TOC), total nitrogen (TN), stable carbon isotope (delta 13C), and total hydrolysable amino acids (THAA). The results showed a mixture of marine organic matter and soil-derived organic matter in the study area, with relatively fresh organic matter found near the Shandong Peninsula, but overall significant degradation of SOM.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Engineering, Environmental
Jing Wang, Lufeng Chen, Yue Song, Yanbin Li, Guangliang Liu, Yongguang Yin, Yong Cai
Summary: The Yellow Sea in China is experiencing severe mercury pollution, despite the relatively low concentration of mercury in its sediment. The study found that organic matter and particle size influenced the mercury adsorption capacity of the sediment.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Ying Zhang, Wei Mao, Ruohan Li, Yang Liu, Peng Wang, Zelin Zheng, Yuntao Guan
Summary: This study analyzed the distribution, risk, and sources of heavy metals, nutrients, and physicochemical parameters in the sediment of Shenzhen River. The results showed that the heavy metal pollutants were mainly Cd, Cu, Zn, Pb, Ni, and Cr, originating from industrial and domestic wastewater. Non-point sources such as urban surface runoff, natural sources, and solid waste also contributed to the pollution.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Ye Li, Min Liu, Lijun Hou, Xiaofei Li, Guoyu Yin, Pei Sun, Jing Yang, Xinyi Wei, Yue He, Dongsheng Zheng
Summary: This study investigated the geographical distribution of PAHs in estuarine sediments along different latitudes in China, using a compound-specific carbon isotope approach to characterize the sources of PAHs. It was found that human activities significantly impact PAHs pollution in estuaries, with coal processing and biomass combustion being identified as the main sources of PAHs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Nguyen Ngoc Anh
Summary: This study aims to determine the concentrations of 23 metallic elements in superficial sediments of the Tien Hai nature reserve. Correlation analysis, principal components analysis, and positive matrix factorization were used to identify and quantify the sources of these metals. The results showed that correlation analysis was effective in identifying both allochthonous and authigenous origins of metals. The PMF model performed better than PCA in source identification. Findings suggested that weathering products from different parent rocks were the main natural sources of metals, while agricultural activities were the major anthropogenic sources. These results provide a scientific basis for environmental protection and control of sediment metal pollution.
MARINE POLLUTION BULLETIN
(2022)
Article
Engineering, Environmental
Junghyun Lee, Seongjin Hong, Taewoo Kim, Shin Yeong Park, Jihyun Cha, Youngnam Kim, Jiyun Gwak, Sunggyu Lee, Hyo-Bang Moon, Wenyou Hu, Tieyu Wang, John P. Giesy, Jong Seong Khim
Summary: Novel AhR agonists were identified in coastal sediments in the Yellow and Bohai Seas using a combination of effect-directed analysis and in silico prediction. These newly identified AhR agonists may have significant implications for the toxic effects of sediments.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Devarajan Nagarajan
Summary: The area fraction and number density of twins were measured in various magnesium alloys under different tensile strains. The results showed that twinning occurred rapidly in pure magnesium, gradually in magnesium-zinc alloys, and an intermediate behavior in magnesium-aluminum alloys. In the more dilute magnesium-aluminum alloys, the area fraction and number density decreased with concentration, but increased again for 9% aluminum, surpassing that of pure magnesium at high strains. In magnesium-zinc alloys, both parameters decreased monotonically with increasing zinc concentration up to the solubility limit. Additionally, the number density increased as the grain size decreased in all three materials. It was suggested that the availability of nucleating sites created by microplasticity and the increased specific grain boundary area contributed to the increased number density.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Environmental Sciences
Teng Wang, Baojie Li, Wenwen Yu, Xinqing Zou
Summary: The research revealed low abundance of microplastics in the Jiangsu Coastal Area, with a distribution trend of high near shore and low far shore, and the most severe pollution in the southernmost part. Clothing fibers were identified as the main source in the northernmost and southernmost regions, while decomposition of hard, large plastic waste was the major source type in the middle region.
MARINE POLLUTION BULLETIN
(2021)
Article
Engineering, Environmental
Pyeong-Koo Lee, Jaesoo Lim, Youn-Joong Jeong, Seho Hwang, Jin-Young Lee, Byoung-Young Choi
Summary: This study assessed metal(loid) pollution in Gunsan Reservoir, South Korea, over the last century by analyzing metal(loid) concentrations, Pb isotope ratios, and 210Pb dating of sediments. It was found that contributions of Cu smelting and Asian dust influx to pollution varied over time, highlighting the importance of understanding changes in pollution sources for environmental management.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Xinyun Li, Lulu Li, Zijun Zhou, Ting Li, Ji An, Shirong Zhang, Xiaoxun Xu, Yulin Pu, Guiyin Wang, Yongxia Jia, Xiaojing Liu, Yun Li
Summary: The study assessed the differences in sources, pollution levels, and source-oriented human health risks (HHR) of potentially toxic element (PTE) pollution in urban soils across different urban intensity areas. The results showed that traffic activities and atmospheric deposition were major contributors to PTE pollution in medium and high urbanization intensity areas, while all sources had relatively similar contributions in low urbanization intensity areas. Cd was identified as the most polluting element, with the highest pollution levels in high urbanization intensity areas. The source-oriented assessment of HHR revealed that atmospheric deposition was the primary contributor to carcinogenic risk for children, while agricultural activities, traffic activities, and atmospheric deposition were the main contributors for adults in different urban intensity areas.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Environmental Sciences
Cong Wang, Yujie Mao, Wuquan Zhou, Yong Li, Guoqing Zou, Boqi Chen, Zhi Wang
Summary: Antibiotic residues in lake sediments from four agricultural lakes in central China were investigated. The study revealed the vertical distribution pattern and sources of antibiotics in the sediments. The highest concentrations were found in the middle-layer sediments, and the presence of certain elements and organic matter also affected the distribution of antibiotics. The study emphasized the importance of prevention and control of antibiotic contamination in lakes.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Biotechnology & Applied Microbiology
Shiyan Liao, Gaoqi Jin, Muhammad Aman Khan, Youwei Zhu, Lili Duan, Wenxuan Luo, Junwei Jia, Bin Zhong, Jiawei Ma, Zhengqian Ye, Dan Liu
Summary: The study found that intensive human activities, especially atmospheric deposition, industrial emissions, and traffic emissions, are the main causes of heavy metals pollution in suburban farmland soil. Although natural sources still make the largest contribution, input of human activities including industry, transportation, and agriculture cannot be ignored.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Geosciences, Multidisciplinary
Hongjin Chen, Zhaokai Xu, Dhongil Lim, Peter D. Clift, Fengming Chang, Tiegang Li, Mingjiang Cai, Wei Wang, Zhaojie Yu, Rongtao Sun
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Marine & Freshwater Biology
Sung-Han Kim, Jae Seong Lee, Kyung-Tae Kim, Sang-Lyeol Kim, Ok Hwan Yu, Dhongil Lim, Suk Hyun Kim
JOURNAL OF SEA RESEARCH
(2020)
Article
Oceanography
Hoi-Soo Jung, Jihun Kim, Dhongil Lim, Dohyun Jeong, Junho Lee, Zhaokai Xu
Summary: A new sediment source proxy model using rare earth elements (REEs) was proposed to quantify sediment source apportionments in the Yellow Sea. The study found distinct differences in the REE fractionation patterns of riverine and shelf-mud sediments, indicating potential variations in source rock compositions. The results provide insights into the disagreement between mud budget and river discharge in Korean coastal mud deposits, as well as the source interpretation of the Yellow Sea shelf-mud deposits.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Zhaokai Xu, Shiming Wan, Christophe Colin, Peter D. Clift, Fengming Chang, Tiegang Li, Hongjin Chen, Mingjiang Cai, Zhaojie Yu, Dhongil Lim
Summary: This text discusses the impact of the Himalayan and Tibetan highlands on global carbon and climate cycles, finding that during glacial periods, intensified erosion in highlands led to a significant input of terrigenous detritus and organic carbon into the Arabian Sea and Bay of Bengal, while the South China Sea experienced increased continental weathering and organic matter preservation. The enhanced burial flux of organic carbon in tropical marginal seas during glacials highlights the significant contributions tropical regions can have on the global climate system.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Hoi-Soo Jung, Dhongil Lim, Zhaokai Xu, Jihun Kim, Junho Lee, Dohyun Jeong
Summary: This study categorized and analyzed the sediment properties of the South Korean coastal areas to rationalize zoning based on natural oceanographic characteristics. Three characteristic zones were identified based on tidal regimes and sediment properties, with differences in grain size and elemental concentrations among the zones. The study suggests that tidal forces play a significant role in shaping sediment characteristics, while sediment provenance also influences the sediment properties. No anthropogenic pollution was detected in this case study, but different mineral concentrations in sediments were not limited by tidal flow regimes.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geography, Physical
Hongjin Chen, Zhaokai Xu, Germain Bayon, Dhongil Lim, Sietske J. Batenburg, Maria Rose Petrizzo, Takashi Hasegawa, Tiegang Li
Summary: This study provides insights into the character, evolutionary history, and driving mechanisms of the Oceanic Anoxic Event 2 (OAE 2) by analyzing a stratigraphically continuous succession in the Mentelle Basin off southwest Australia. The results suggest that OAE 2 was associated with increased sediment contribution from distant sources, as well as enhanced riverine-driven marine productivity.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Geography, Physical
So-Young Kim, Dhongil Lim, Lorena Rebolledo, Taewook Park, Oliver Esper, Praxedes Munoz, Hyoung Sul La, Tae Wan Kim, SangHoon Lee
Summary: Studies on the Amundsen Sea polynya show that environmental shifts in the region over the past 350 years are closely linked to large-scale climate patterns such as the Southern Annular Mode and El Niño-Southern Oscillation. It is speculated that changes in atmospheric and oceanic circulation induced by increasing greenhouse gas levels have played a significant role in the mid-20th century invigoration of Circumpolar Deep Water intrusion. This research highlights the impact of global warming on the Antarctic environment and its connection to ocean-atmosphere reorganizations.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Dhongil Lim, Jihun Kim, Jonguk Kim, Dongsung Kim, Dohyun Jeong, Haryun Kim, Zhaokai Xu
Summary: Sedimentary evidence from a well-dated sediment core from the Central Indian Ridge reveals enhanced volcanic activity during the last deglaciation period, possibly linked to sea-level variability. The study suggests that the increase in submarine and subaerial volcanic eruptions during the last deglaciation may have accelerated the rise of atmospheric CO2, reinforcing a positive feedback mechanism upon deglaciation.
Article
Environmental Sciences
Dhongil Lim, Jihun Kim, Wonnyon Kim, Jonguk Kim, Dongsung Kim, Le Zhang, Kyungun Kwack, Zhaokai Xu
Summary: This study investigates the recently discovered Onnuri hydrothermal vent field (OVF) in the Central Indian Ridge and reveals its characteristics, such as high concentrations of chemical elements and abundant hydrothermal precipitates. The OVF is found to be an off-axis, high-temperature hydrothermal circulation system, possibly driven by the exothermic serpentinization of exposed peridotites.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Teddy Namirimu, Yun Jae Kim, Mi-Jeong Park, Dhongil Lim, Jung-Hyun Lee, Kae Kyoung Kwon
Summary: This study investigated the microbial communities in hydrothermal fields in the Central Indian Ridge using a metagenomic sequencing approach. The results showed that the microbial communities were similar in different sampling sites, with bacteria dominating over archaea. The microbial populations in these vent fields exhibited diverse metabolic capabilities, including aerobic respiration, carbon fixation, and sulfur and nitrogen metabolisms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Qingchao Fan, Zhaokai Xu, Kenneth G. MacLeod, Hans-Jurgen Brumsack, Tiegang Li, Fengming Chang, Shiming Wan, Laurent Riquier, Delong Fu, Zhendong Luan, Baichuan Duan, Hongjin Chen, Wei Wang, Dhongil Lim
Summary: This study presents the first detailed sedimentary and geochemical record of the OAE 1d at southern high latitudes, linking it to the Central Kerguelen large igneous province volcanism. Increased continental runoff from southwestern Australia weakened bottom-water oxygenation and enhanced organic matter burial in the southeastern proto-Indian Ocean during OAE 1d.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Jihun Kim, Dhongil Lim, Dohyun Jeong, Zhaokai Xu, Haryun Kim, Jonguk Kim, Dongsung Kim
Summary: The study investigates the characterization of mercury in the deep-sea ridge environment, focusing on its concentration, chemical forms, and isotopic compositions in surface sediments from the Central Indian Ridge. The results show that hydrothermal activity driven by serpentinization is associated with highly elevated mercury concentrations in sediments near hydrothermal vents. The dominant sources of mercury are syngenetic magmatic or mantle-derived materials, with preferential precipitation of lighter isotopes during sulfide formation.
Article
Geography, Physical
Wei Wang, Christophe Colin, Zhaokai Xu, Dhongil Lim, Shiming Wan, Tiegang Li
Summary: The Eocene period was characterized by global plate reorganization and a transition from a warm climate to a cool climate. The sedimentary history in the Southern Ocean during this period is important for understanding the environmental changes caused by the separation of Australia and Antarctica and global cooling. This study presents a detailed record of sediment from the Mentelle Basin off southwestern Australia, revealing the provenance and paleoenvironmental evolution during the Eocene. The results show that sediments mainly originated from southwestern Australia and the Naturaliste Plateau. Provenance variations indicate increased volcanic materials from the Naturaliste Plateau due to the separation of Australia and Antarctica. Changes in sediment provenance during the middle Eocene were mainly driven by paleoclimate changes rather than tectonic processes. Warm reversal in the southern latitudes lasting for 5 million years during the Eocene provides an exception to the short-lived hyperthermals observed throughout this period. The late Eocene was characterized by tectonic processes leading to rapid detritus accumulation and a shift in sediment provenance.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Environmental Sciences
Hyuntae Choi, Bohyung Choi, Yoshito Chikaraishi, Yoshinori Takano, Haryun Kim, Kitack Lee, Dhongil Lim, Kyung-Hoon Shin
Summary: This study used compound-specific isotope analysis to investigate the variation of delta N-15 associated with microbial processes in marine sediment samples. The results showed that the decrease in amino acid concentrations in sediment was accompanied by an increase in delta N-15 values. Phenylalanine displayed a depth-dependent variation in microbial utilization, while glycine showed the highest relative molar contribution and delta N-15 increase in deep sediment. These findings provide an important basis for interpreting the delta N-15 values of amino acids in sediment.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Jae-Won Yoo, Yong-Woo Lee, Mi-Ra Park, Chang-Soo Kim, Sungtae Kim, Chae-Lin Lee, Su-Young Jeong, Dhongil Lim, Sung-Yong Oh
Summary: Macrobenthic community ecological index is a crucial tool for assessing the biological quality of habitats and ecosystems. This study tested the applicability of the inverse function of the Shannon-Wiener evenness proportion (ISEP) in the west coast of Korea and validated its relationship with environmental factors and species abundance. The findings showed that ISEP was significantly correlated with suspended solids and could be used in various sediment habitats. It exhibited similar patterns to the Pearson-Rosenberg (P-R) model for species-abundance-biomass (SAB) and taxonomic variations, except for biomass.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)