Article
Environmental Sciences
Xufei Liu, Nan Wang, Xiaopu Lyu, Yangzong Zeren, Fei Jiang, Xinming Wang, Shichun Zou, Zhenhao Ling, Hai Guo
Summary: The photochemical O3 pollution over the Pearl River Estuary is mainly affected by VOC and NOx, with different O3 formation mechanisms in two patterns.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Theresa Wing Ling Lam, Lincoln Fok, Anson Tsz Hin Ma, Heng-Xiang Li, Xiang-Rong Xu, Lewis Ting On Cheung, Ming Hung Wong
Summary: This study examined the abundance of microplastics in the stomach and intestine of marine-cultured hybrid groupers in the Pearl River Estuary. Microplastics were found in all fish samples, with a higher concentration in the intestine than in the stomach, and predominantly in the form of fiber-shaped particles.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Wei Tao, Lixia Niu, Yanhong Dong, Tao Fu, Quansheng Lou
Summary: The study in the Pearl River Estuary revealed a significant increase in nitrogen and phosphorus concentrations over the past two decades, largely influenced by riverine inputs. Phosphorus accumulation in the northeast region led to eutrophication risks and blooms, impacting the aquatic environment. The biogeochemical processes in the estuary were highly sensitive to nutrient pollution, particularly nitrogen and phosphorus, with phosphorus being identified as the limiting factor for phytoplankton growth.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Junlian Qin, Yufeng Yang, Ning Xu, Qing Wang, Xian Sun
Summary: The spatio-seasonal variation, bioaccumulation, and potential ecological risk of four metals (Co, Ni, Cu, and Zn) in the multi-media of the Pearl River Estuary (PRE) were assessed. The contamination and ecological risk followed the pattern: Cu > Zn > Ni > Co, upstream > downstream, wet season > dry season. The study found cross-accumulation of these four transition metals in fish within specific habitats of the PRE.
MARINE POLLUTION BULLETIN
(2022)
Review
Environmental Sciences
Wenlong Chen, Fang Guo, Weijie Huang, Jianguo Wang, Min Zhang, Qian Wu
Summary: Phytoplankton plays a crucial role in the estuarine ecosystem, but the Pearl River estuary (PRE) has experienced complex changes in phytoplankton community structure due to human activities. This review analyzes the variation characteristics of phytoplankton species, species diversity, and abundance in the PRE from the 1980s to 2020s. The results show a significant decrease in phytoplankton species, no significant difference in abundance, and a downward trend in species diversity. Human activities also greatly influence phytoplankton composition, with higher abundance in nearshore waters.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Hao Hu, Yang Li, Guangyuan Lu, Wen-Xiong Wang, Huizhen Li, Jing You
Summary: A 6-year biomonitoring study with oysters in the Pearl River Estuary (PRE), China, examined the annual, seasonal, and spatial characteristics of ultraviolet absorbents (UVAs). The study found that the concentrations of UVAs ranged from 9.1 to 119 ng/g dry wt., peaking in 2018. Significant spatiotemporal variations in UVA contamination were observed, with higher concentrations during the wet season and on the more industrialized eastern coast. Environmental factors such as precipitation, temperature, and salinity significantly influenced UVA bioaccumulation in oysters.
ENVIRONMENTAL POLLUTION
(2023)
Article
Biodiversity Conservation
Fangzhou Chen, Xiu Pei Koh, Mandy Lok Yi Tang, Jianping Gan, Stanley C. K. Lau
Summary: This study used a microbial community-based index to assess the ecological status of the Pearl River estuary in China, showing poor overall status. The index values decreased from the upper estuary to offshore areas and were positively correlated with nutrients and fecal indicator bacteria, representing eutrophication and fecal pollution levels. Machine learning analysis identified several bio-indicators at the genus level to supplement the index and improve assessment accuracy.
ECOLOGICAL INDICATORS
(2021)
Article
Ecology
Yangyang Zhao, Khanittha Uthaipan, Zhongming Lu, Yan Li, Jing Liu, Hongbin Liu, Jianping Gan, Feifei Meng, Minhan Dai
Summary: Intermittent hypoxia in the Pearl River estuary is influenced by factors such as typhoons and biochemical processes, leading to destruction and rapid restoration of hypoxic conditions. Freshwater inputs suppress hypoxia formation, and the reinstatement of hypoxia is influenced by offshore subsurface water intrusion. This study highlights the importance of understanding hypoxia intermittency in coastal areas under changing climate conditions.
Article
Environmental Sciences
Hongzhou Xu, Jian Shen, Dongxiao Wang, Lin Luo, Bo Hong
Summary: The Pearl River Estuary exhibits unique dynamics of subtidal estuarine circulation, with significant nonlinear advection effects observed, especially during spring tide. Overall, nonlinear advections play an important role in driving the circulation in the Pearl River Estuary, particularly during ebb tide.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Engineering, Environmental
Jinli Xie, Nancai Pei, Yuxin Sun, Zhongyang Chen, Yuanyue Cheng, Laiguo Chen, Chenmin Xie, Shouhui Dai, Chunyou Zhu, Xiaojun Luo, Li Zhang, Bixian Mai
Summary: This study investigates the distribution and bioaccumulation of organophosphate esters (OPEs) in mangrove ecosystems. It was found that OPEs were mainly absorbed in aboveground tissues of mangrove plants and their concentrations in mangrove animals were related to lipid contents, feeding habits, and hydrophobicity of OPEs. The study highlights the bioaccumulation risk of OPEs in mangrove biota.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Hui Shi, Yao Luo, Fenghua Zhou, Chunhua Qiu, Dongxiao Wang, Zhenqiu Zhang
Summary: The study of surface wave occurrence and characteristics is of great importance in the Pearl River Estuary for various human activities. The wave system in the estuary deviates from the assumption of a stationary stochastic process due to abnormal waves caused by human activities. Ship wakes were identified as the cause of these abnormal waves, and they are an important component of the wave system in the Pearl River Estuary.
Article
Geography, Physical
Yong He, Xiaojian Liu, Zihao Duan, Cheng Liu, Peng Hou, Chen Lu, Yao Wu
Summary: This study analyzes the morphodynamics of the Modaomen Estuary in China using satellite imagery, high-resolution bathymetry survey data, and hydrographic measurements. The research reveals that the estuary has transformed from a fluvial-and tide-dominated system to a fluvial-and wave-dominated system. The findings provide important insights for numerical modeling of estuary evolution, estuarine regulation, hazard prevention, and channel navigability.
Article
Environmental Sciences
Yufeng Fan, Zhenpeng Li, Bosheng Li, Bixia Ke, Wenxuan Zhao, Pan Lu, Zhe Li, Tong Zhang, Xin Lu, Biao Kan
Summary: Estuarine ecosystems undergo significant and complex changes due to freshwater and saltwater mixing. Urbanization and population growth in estuarine regions result in shifts in bacterial communities and accumulation of antibiotic resistance genes (ARGs). The dynamic changes in bacterial communities, environmental factors, and ARG carriage from freshwater to seawater have yet to be fully understood.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Qiang Xie, Fei Liu, Xiyang Zhang, Yuping Wu
Summary: Seafood is considered healthy but also a potential exposure source of contaminants. Analysis of fish species from the eastern and western Pearl River Estuary revealed higher levels of organohalogen contaminants (OHCs) in the eastern region. Species at higher trophic levels had higher OHC levels, indicating the biomagnification potential in the estuary ecosystem.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Feng Ye, Guodong Jia, Gangjian Wei, Wei Guo
Summary: This study uses a multi-stable isotope approach to quantitatively analyze oxygen consumption processes in the Pearl River Estuary. The results show that organic carbon degradation through oxygen respiration is the dominant oxygen-consuming process in the upper reach and inner estuary, while nitrification also plays a significant role in the upper reach.
MARINE ENVIRONMENTAL RESEARCH
(2022)
Article
Microbiology
Satheeswaran Thangaraj, Haijiao Liu, Yiyan Guo, Changling Ding, Il-Nam Kim, Jun Sun
Summary: Ocean warming and acidification have interactive effects on coccolithophore physiology and result in significant biogeochemical changes. In this study, we investigated the long-term effects of different transitional periods on the physiology of the coccolithophore Chrysotila dentata under present and projected ocean conditions. Our results showed that physiological responses of HTHC cells decreased with long-exposure, but the overall physiology of HTHC cells continued to improve with each generation. This suggests that coccolithophore resilience increases over generations under ocean warming and acidifying conditions.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Yunxue Li, Sitong Liu, Zhiyong Ji, Jun Sun, Xianhua Liu
Summary: This study systematically investigated the sorption behavior of two typical microplastics (PVC and PE) to Zn(II) and their combined toxic effects on Chlorella vulgaris. The results showed that different microplastics exhibited different adsorption capacities for Zn(II) and the combined exposure to Zn(II) and microplastics had distinct effects on cell growth and oxidative stress.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Yuqiu Wei, Dongsheng Ding, Ting Gu, Yong Xu, Xuemei Sun, Keming Qu, Jun Sun, Zhengguo Cui
Summary: Data on the independent or combined effects of ocean acidification and warming on coastal eutrophication and organic pollution are limited. Acidification favors eutrophication and organic pollution, while warming inhibits these two variables. However, the interaction between acidification and warming in the future may exacerbate organic pollution but mitigate eutrophication.
MARINE POLLUTION BULLETIN
(2023)
Article
Oceanography
Congcong Guo, Guicheng Zhang, Shan Jian, Wei Ma, Jun Sun
Summary: The quantification of transparent exopolymer particles (TEP) by colorimetric method is prone to large errors and low repeatability, mainly due to undefined and unassessed steps in the original method. It is uncertain whether the 80% sulfuric acid solution used as the extraction solution for TEP determination is prepared based on volume ratio or mass ratio. In addition, changes in the solubility of Gum Xanthan (GX) from the market rendered the original protocol ineffective, and the grinding of GX stock solution was replaced with shaking using a rotating shaker to prevent excessive dissolution. Different preparation techniques resulted in varied concentrations of 80% H2SO4. The shaking duration during the preparation of standard solution significantly affected the calibration curve slope, leading to different correction results for TEP.
ACTA OCEANOLOGICA SINICA
(2023)
Article
Environmental Sciences
Xudong Cui, Liying Peng, Yu Guo, Guicheng Zhang, Haijiao Liu, Yujian Wen, Guodong Zhang, Jun Sun
Summary: This paper investigates the distribution, sources, and deposition fluxes of aerosol nutrients in the Bohai Bay and their impacts on the marine ecosystem. The results show that the concentrations of typical aerosol nutrients are generally higher in autumn than in summer, with high values mainly occurring in the central region. The potential sources of pollution are mainly concentrated in Shandong and Mongolia, and include agriculture, dust, and industry.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Zhuo Chen, Ting Gu, Jun Sun
Summary: This study investigated the distribution and changes of pico-phytoplankton in the Eastern Indian Ocean and estimated their carbon biomass contributions. Prochlorococcus, Synechococcus, and picoeukaryotes were the major picophytoplankton taxa. Their abundance varied with depth, with Synechococcus in the surface layer and Prochlorococcus and picoeukaryotes in the subsurface layer. Environmental factors such as fluorescence, temperature, dissolved oxygen concentration, and nutrients played important roles in shaping the picophytoplankton communities in this region.
ENVIRONMENTAL RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Yingjie Mao, Jun Sun, Congcong Guo, Shuang Yang, Yuqiu Wei
Summary: The direct sinking behavior of phytoplankton is crucial for the ocean carbon cycle. After comparing different methods, the SETCOL method was chosen for studying cell sinking behavior. The study analyzed samples from the South China Sea and found that the Kuroshio Current increased sinking rates while Tropical Storms slowed them down.
JOURNAL OF MARINE SYSTEMS
(2023)
Article
Environmental Sciences
Xianfeng Li, Wenzhe Xu, Shuai Song, Jun Sun
Summary: Water quality monitoring stations are essential for detecting excess pollutants in river sections, but identifying the causes of these exceedances can be challenging, especially in heavily polluted rivers with multiple contamination sources. In this study, we used the SWAT model to simulate pollution loads from different sources in the Haihe River Basin and analyzed the spatiotemporal distribution of pollutants. The results highlight the need for targeted prevention and control policies based on the primary sources of pollution loads in different regions.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Xinze Shuwang, Guodong Zhang, Danyang Li, Yujian Wen, Guicheng Zhang, Jun Sun
Summary: This study investigated the effects of human activity-induced environmental heterogeneity on the chromophytic phytoplankton in Bohai Bay. The results showed that human disturbance had a greater impact on the phytoplankton communities than natural factors. The assembly of the communities was influenced by both stochastic and deterministic processes, with different importance rankings in nearshore and offshore areas. Dissolved inorganic nitrogen, eutrophication index, and chemical oxygen demand were the main environmental factors affecting the phylogenetic turnover of the phytoplankton.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yang Liu, Xiaofang Liu, Yi Long, Yujian Wen, Chao Ma, Jun Sun
Summary: This study investigates the molecular composition and component characteristics of marine dissolved organic matter (DOM) in the eastern Indian Ocean. It reveals the presence of thousands of individual DOM formulas, including recalcitrant compounds and stable components. The study also uncovers a shift in the composition of DOM with depth, indicating the aging of the water column.
Article
Environmental Sciences
Wenzhuo Yan, Zhuo Chen, Linlin Zhang, Feng Wang, Guicheng Zhang, Jun Sun
Summary: This study used the Utermohl method and carbon volume conversion to investigate the composition and distribution of phytoplankton in the western Tropical Pacific Ocean. Four primary groups of phytoplankton were identified: dinoflagellates (181 species), diatoms (73 species), cyanobacteria (4 species), and chrysophyceae (2 species). Clustering analysis revealed that phytoplankton could be classified into four groups based on their composition, which were closely related to ocean currents. The study also found that diatoms were abundant in areas influenced by current-seamount interaction, while areas with little influence from ocean currents were dominated by Trichodesmium. The majority of phytoplankton had an equivalent spherical diameter (ESD) of 2-12 μm, with some exceeding 25 μm. Nanophytoplankton (ESD = 2-20 μm) dominated cell abundance, but microphytoplankton (ESD = 20-200 μm) contributed significantly to carbon biomass (792.295 mg m(-3)). This study provides valuable insights into the distribution and composition of phytoplankton in the western Tropical Pacific Ocean and their relationship with ocean currents, as well as fundamental information regarding cell size and carbon biomass within the region.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Ziming Wang, Dai Jia, Shuai Song, Jun Sun
Summary: Given the threat to water quality from human activities, it is necessary to identify and quantify potential pollution sources for water pollution control. Multivariate methods were used to assess water quality in the Yuqiao Reservoir and surrounding rivers, and identified seven main pollution sources including cities, rural districts, industries, weather, fertilizers, upstream areas, and vehicles. The results showed that upstream and urban districts were the major contributors to pollution. The study also compared positive matrix factorization (PMF) and absolute principal component scores and multiple linear regression (APCS-MLR) modeling, with APCS-MLR performing better.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Haijiao Liu, Changling Ding, Guicheng Zhang, Yiyan Guo, Yuyao Song, Satheeswaran Thangaraj, Xiaodong Zhang, Jun Sun
Summary: This study evaluated the distribution and pollution status of toxic heavy metals in seawater and sediment of the Bohai Bay coastal system. The results showed a decline in metal pollution due to recent pollution control measures. The seawater posed a moderate to high level of ecological risk, and the hydrochemical factors had different impacts on dissolved and suspended metals.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Marine
Lixing Wang, Yunpeng Zhang, M. Hesham El Naggar, Hao Liu, Xin Liu, Wenbing Wu, Jun Sun
Summary: This paper presents a novel CSW model to simulate the interaction between piles and cohesionless soil under lateral cyclic loads, which enhances the depiction of resistance and failure pattern of the soil. The validated model accurately predicts the response characteristics of piles under different loading conditions.
Article
Geosciences, Multidisciplinary
Zhibo Shao, Yangchun Xu, Hua Wang, Weicheng Luo, Lice Wang, Yuhong Huang, Nona Sheila R. Agawin, Ayaz Ahmed, Mar Benavides, Mikkel Bentzon-Tilia, Ilana Berman-Frank, Hugo Berthelot, Isabelle C. Biegala, Mariana B. Bif, Antonio Bode, Sophie Bonnet, Deborah A. Bronk, Mark V. Brown, Lisa Campbell, Douglas G. Capone, Edward J. Carpenter, Nicolas Cassar, Bonnie X. Chang, Dreux Chappell, Yuh-ling Lee Chen, Matthew J. Church, Francisco M. Cornejo-Castillo, Amalia Maria Sacilotto Detoni, Scott C. Doney, Cecile Dupouy, Marta Estrada, Camila Fernandez, Bieito Fernandez-Castro, Debany Fonseca-Batista, Rachel A. Foster, Ken Furuya, Nicole Garcia, Kanji Goto, Jesus Gago, Mary R. Gradoville, M. Robert Hamersley, Britt A. Henke, Cora Horstmann, Amal Jayakumar, Zhibing Jiang, Shuh-Ji Kao, David M. Karl, Leila R. Kittu, Angela N. Knapp, Sanjeev Kumar, Julie LaRoche, Hongbin Liu, Jiaxing Liu, Caroline Lory, Carolin R. Loscher, Emilio Maranon, Lauren F. Messer, Matthew M. Mills, Wiebke Mohr, Pia H. Moisander, Claire Mahaffey, Robert Moore, Beatriz Mourino-Carballido, Margaret R. Mulholland, Shin-ichiro Nakaoka, Joseph A. Needoba, Eric J. Raes, Eyal Rahav, Teodoro Ramirez-Cardenas, Christian Furbo Reeder, Lasse Riemann, Virginie Riou, Julie C. Robidart, Vedula V. S. S. Sarma, Takuya Sato, Himanshu Saxena, Corday Selden, Justin R. Seymour, Dalin Shi, Takuhei Shiozaki, Arvind Singh, Rachel E. Sipler, Jun Sun, Koji Suzuki, Kazutaka Takahashi, Yehui Tan, Weiyi Tang, Jean-Eric Tremblay, Kendra Turk-Kubo, Zuozhu Wen, Angelicque E. White, Samuel T. Wilson, Takashi Yoshida, Jonathan P. Zehr, Run Zhang, Yao Zhang, Ya-Wei Luo
Summary: This study presents an updated version (version 2) of the global oceanic diazotroph database, which significantly increases the number of in situ diazotrophic measurements and provides more detailed insights into nitrogen fixation in the global ocean. Version 2 yields significantly higher estimates of nitrogen fixation rates compared to version 1, particularly in the South Pacific and North Atlantic regions. Furthermore, additional data sheets for non-cyanobacterial diazotrophs and cell-specific N2 fixation rates have been included in version 2, enhancing the database's comprehensiveness.
EARTH SYSTEM SCIENCE DATA
(2023)