Article
Marine & Freshwater Biology
Lam Nguyen-Ngoc, Sarah C. Weber, Hai Doan-Nhu, Ajit Subramaniam, Maren Voss, Joseph P. Montoya
Summary: The South China Sea is a complex and dynamic marginal sea with great economic importance. It experiences strong seasonal forcing from the monsoon cycle, which affects river runoff and circulation. A study found a wide distribution of host diatoms and Diatom-Diazotroph Associations (DDAs) in different habitats of the South China Sea, with the lowest infection rates and intensities in waters affected by coastal upwelling.
Article
Environmental Sciences
Mengyang Liu, Jiahui Hu, Yan Lin, Hongwei Ke, Jiongjie Lian, Ye Xu, Kai Chen, Haowen Zheng, Mian Chen, Minggang Cai
Summary: Oceanic processes such as coastal upwelling and mesoscale eddy can influence the distribution and behavior of semi-volatile organic pollutants in marine environments. This study in the South China Sea found that PAH concentrations were influenced by these oceanic processes, with potential vertical fluxes estimated for pollutants in different regions. Further research is needed to investigate the seasonal variations in pollutant transport related to monsoon characteristics.
Article
Oceanography
Yulong Yao, Chunzai Wang
Summary: Marine heatwaves (MHWs) in the South China Sea during summer, especially near the Nansha Islands and Beibu Gulf, have shown a significant increasing trend in the MHW days, duration, and frequency during 1982-2020. This is likely due to the anomalous intensification of the western North Pacific high pressure system causing disruptions in the summer southwest monsoon, leading to severe basin-wide MHWs in the South China Sea.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geography, Physical
Guiyan Han, Fenglin Tian, Chunyong Ma, Ge Chen
Summary: The study of the average shape and orientation of eddies in the South China Sea reveals that the elliptical shape of eddies influences oceanic variables differently from global eddies, providing a new approach to explore the impact of air-sea interactions on oceanic eddies.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2021)
Article
Oceanography
Mai-Han Ngo, Yi-Chia Hsin
Summary: Summertime upwelling off the southern Vietnamese coast is classified into three sub-regions, each influenced by different factors and intensities. Along-shore wind stress and wind stress curl are identified as the main drivers of upwelling.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Jiaxing Liu, Huangchen Zhang, Xiang Ding, Linbin Zhou, Zhixin Ke, Jiajun Li, Yehui Tan
Summary: This study investigated the interaction of multiple dynamic processes on nitrogen fixation and found that the upwelling and Kuroshio current play important roles in nitrogen fixation. The high phosphorus content and low N:P ratio in the upwelling area led to higher nitrogen fixation rates and abundance of diazotrophic cyanobacteria. Additionally, the shelf break affected by the Kuroshio current had higher abundance of diazotrophic cyanobacteria. Adddition of phosphorus increased nitrogen fixation rates and stimulated cyanobacteria growth.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Acoustics
Yushen Wu, Jixing Qin, Zhenglin Li, Shuanglin Wu, Mengyuan Wang, Wen Li, Yonggang Guo
Summary: The spatial and temporal redistribution of sound energy caused by a warm eddy was measured in the South China Sea through a multiday experiment. The experiment utilized two vertical line arrays, a mooring source, and some wide-band explosive sources. The experiment analyzed and explained the influence of the warm eddy on sound propagation during its lifespan, showing that energy is redistributed both spatially and temporally due to the presence of the warm eddy.
Article
Environmental Sciences
Zhengchao Wu, Qian P. Li, Richard B. Rivkin, Senjie Lin
Summary: This study focuses on the role of polyunsaturated aldehydes (PUAs) produced by diatoms in microbial phosphorus (P) recycling after bloom phase. The findings suggest that PUAs may play a crucial role in bacterial P-remineralization in P-limited coastal areas.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Yikai Yang, Lili Zeng, Qiang Wang
Summary: Eddy-induced transport through the Luzon Strait significantly impacts the physical and biological properties of the South China Sea. Comprehensive evaluation of eddy-induced volume, heat, and salt transport highlights the non-negligible role of eddies in water exchange through the Luzon Strait.
Article
Geosciences, Multidisciplinary
Jinwei Gao, Shiguo Wu, Thomas Luedmann, Chun-Feng Li, Lin Li, Yintao Lu, Zhili Yang, Liyan Tian, Yongpeng Qin, Taoran Song
Summary: This study examines the crustal structure and Cenozoic magmatism in the northwestern South China Sea using seismic reflection profiles, gravity and magnetic data, and refraction profiles. The results show the presence of basins/sags bounded by large normal faults and massifs with smaller normal faults. Magmatic edifices with positive gravity and magnetic anomalies are found within these structures. The study suggests that syn-rift and post-rift magmatism were influenced by mantle upwelling during seafloor spreading and plume-related mantle upwelling, respectively. The stretching factors indicate differential extension in the upper and lower crusts, possibly resulting from faulting and flow in the lower crust.
Article
Environmental Sciences
Shan Liu, Juncheng Zuo, Yeqiang Shu, Qiyan Ji, Yunxia Cai, Jinglong Yao
Summary: Using satellite observations and reanalysis data, this study examines the long-term trend of coastal upwelling in the South China Sea (SCS) from 1982 to 2020. The findings show increasing upwelling intensity in three typical regions (eastern Guangdong, eastern Hainan, and eastern Vietnam) of the SCS. The study also investigates the causes of intensified upwelling through wind stress curl and wind stress analysis.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Marine
Danyang Li, Shuang Yang, Yuqiu Wei, Xingzhou Wang, Yingjie Mao, Congcong Guo, Jun Sun
Summary: This study investigates the variability of size-fractionated chlorophyll a biomass and its relationship with upwelling, Kuroshio, and nutrients in the northeastern South China Sea. The results show that nano-Chl a contributes more to the total Chl a biomass and that upwelling and Kuroshio play important roles in the distribution of chlorophyll a.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Mei-Lin Wu, You-Shao Wang, Yu-Tu Wang, Fu-Lin Sun, Xiaomei Li, Fang-Fang Gu, Jing-Chang Xiang
Summary: This study investigated the relationship between eddies and phytoplankton in the South China Sea, and found that mesoscale eddies have a significant impact on the vertical distribution pattern of chlorophyll in the South China Sea.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Jianmin Yu, Sheng Lin, Yue Jiang, Yuntao Wang
Summary: The interactions between mesoscale eddies and typhoons play a crucial role in influencing sea surface cooling (SSC) induced by typhoons. Different relative positions of typhoons and eddies can lead to variations in the cooling effects, with cyclonic and anticyclonic eddies having different impacts on the cooling patterns along typhoon tracks in the South China Sea. Overall, the influences of cyclonic eddies (CEs) and anticyclonic eddies (AEs) on typhoon-induced local SSC are relatively weak in the SCS.
Article
Biology
Changling Ding, Chao Wu, Liuyang Li, Laxman Pujari, Guicheng Zhang, Jun Sun
Summary: This study investigated the spatial variation of diazotrophic communities in the South China Sea and Western Pacific Ocean. The dominant diazotrophs were Proteobacteria in the SCS and Cyanobacteria in the WPO. Temperature, dissolved inorganic nitrogen, and dissolved inorganic phosphate were significantly correlated with variations in diazotroph composition.
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
Biology
Satheeswaran Thangaraj, Jun Sun
Summary: Physiological experiments on Heterosigma akashiwo provide insights into the metabolic changes of algal blooms under future warming and acidification of the ocean. Despite the expected increase in harmful algal species due to ocean warming and acidification, the population of Heterosigma akashiwo has decreased. However, the physical and metabolic modifications of this species in terms of C:N:P ratio and macromolecule accumulation are still unknown.
COMMUNICATIONS BIOLOGY
(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
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
Environmental Sciences
Yiyan Guo, Chao Wu, Zhi Wang, Yifeng Shi, Jun Sun
Summary: This study provides preliminary insights into the distribution patterns of bacterial communities and metal resistance genes in the coastal sediments of Bohai Bay, laying the groundwork for understanding microbial community adaptations and supporting ecological restoration efforts in multi-metal polluted environments.
ENVIRONMENTAL POLLUTION
(2023)
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)