Article
Environmental Sciences
Yanru He, Yihe Wang, Hui Wu
Summary: The effects of large-scale engineering projects in river estuaries on surrounding coastal waters have been less emphasized. This study uses the Changjiang River Estuary as an example to show that such projects can have significant consequences. The research analyzes the variations of algal blooms in the estuary and its adjacent water using harmful algal bloom events data and chlorophyll satellite data. It is found that the location of algal bloom hotspot changed with the construction of the estuary. A numerical model indicates that the redistribution of nutrient concentration and turbidity caused by river plume deviation is responsible for the shift in high chlorophyll concentration area. The direct impact of the Three Gorges Dam is found to be less important than expected. Therefore, caution should be exercised when interpreting hydrodynamic and ecological changes outside the estuary during the same period as these projects.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Lina Lyu, Haorui Liang, Yuhuan Huang, Haibing Ding, Gui-Peng Yang
Summary: This study investigates the components, concentrations, distribution characteristics, and sources of low-molecular-weight organic acids (LMWOAs) in the Changjiang Estuary and its adjacent sea area. The results show that terrigenous inputs, especially the Changjiang runoff, are the dominant sources of LMWOAs. The consistency between hypoxia areas, high concentration areas of LMWOAs, and low pH value areas suggests that annual hypoxia could cause long-term seawater acidification by producing LMWOAs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Hao Wang, Xiangbin Ran, Alexander F. Bouwman, Junjie Wang, Bochao Xu, Zhaoliang Song, Shaobo Sun, Qingzhen Yao, Zhigang Yu
Summary: This study analyzed the sources, distribution, and export of particulate organic carbon (POC) in the Changjiang River to explore the impacts of dam construction. The results showed that dam construction resulted in changes in POC composition, with a decrease in allochthonous POC export and an increase in autochthonous POC. The study also found that POC trapping in nine large rivers impacted by dams accounted for 12% of global riverine POC export. These changes have significant impacts on the estuarine carbon cycle.
JOURNAL OF HYDROLOGY
(2022)
Review
Environmental Sciences
Zhiqiang Liu, Jianping Gan, Hui Wu, Jianyu Hu, Zhongya Cai, Yongfei Deng
Summary: The circulation in the Changjiang Estuary and adjacent East China Sea and Yellow Sea coastal waters is influenced by a complex interplay of winds, tides, riverine discharge, and shelf currents, resulting in a dynamic and diverse marine environment. Seasonal discharge and winds in the Changjiang Estuary lead to the formation of a seasonal Changjiang River plume, which is impacted by various factors when exported offshore, showing notable seasonality and spatial irregularities. Tides and bathymetry irregularities play critical roles in determining cross-shelf exchanges of water mass and momentum, with a year-round upslope intrusion of shelf waters along the pathway of the ECS coastal current.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Feng Xu, Hong-Hai Zhang, Teng Jia, Shi-Bo Yan, Jin-Wei Wu, Chun-Ying Liu, Gui-Peng Yang
Summary: Continuous input from the Changjiang River significantly reshuffled the ecosystems in the Changjiang Estuary and adjacent East China Sea, impacting the production, distribution, and emission of marine dimethyl sulfide (DMS). The effect of phytoplankton biomass and composition on DMS under different nutrient inputs remains poorly understood. Our findings indicate that changes in nutrient inputs will promote DMS emissions from the Changjiang Estuary.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Yu Yu, Junchuan Sun, Bing Li, Xiaoyu Dong, Yichao Ren
Summary: The content, isotopes, and budget of particulate lead (Pb) in the Changjiang Estuary and adjacent East China Sea were investigated to study the biogeochemical cycling of Pb in coastal seas. Particulate Pb originated from the Changjiang River, with higher concentrations in winter due to atmospheric deposition. The budget analysis revealed the significant input and export of Pb by the river and coastal currents, indicating the impact of pollution on Pb distribution in the study area.
Article
Environmental Sciences
Jinqiang Guo, Shengkang Liang, Xinke Wang, Xiaoju Pan
Summary: Large river-dominated estuaries play a crucial role in global marine biogeochemistry, but the reactivity and fate of dissolved organic matter (DOM) in this dynamic region remain poorly understood. Measurements of dissolved organic carbon (DOC) and total dissolved amino acids (TDAAs) help to indicate the photodegradation and transformation of DOM, showing distinct removal mechanisms and dynamic changes depending on DOC source and composition.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Shengkang Liang, Shanshan Li, Jinqiang Guo, Yanqun Yang, Zehao Xu, Mingzheng Zhang, Hongguan Li, Xihua Yu, Haoyang Ma, Xiulin Wang
Summary: This study investigated the sources, distribution, and fate of particulate organic matter (POM) in the Changjiang Estuary and its adjacent sea. The concentrations of POC, PN, and TPAA decreased from the river end-member to the open sea, with the maximum occurring around the turbidity maximum zone. POM concentrations and composition were controlled by terrigenous input and in situ phytoplankton production.
Article
Geosciences, Multidisciplinary
Yue Ming, Lei Gao
Summary: Flocculation, an important process in estuarine mixing, plays a fundamental role in land-to-sea interactions. In this study, the use of LISST measurements and stable isotopic ratios of delta C-13 greatly improved our understanding of suspended particulate matter (SPM) dynamics in the Changjiang River Estuary. The results revealed that flocculation processes were influenced by phytoplankton blooms and involved the aggregation of smaller particles into larger ones.
JOURNAL OF MARINE SYSTEMS
(2022)
Article
Environmental Sciences
Rachel R. Leads, John E. Weinstein, Sarah E. Kell, Johnathan M. Overcash, Bonnie M. Ertel, Austin D. Gray
Summary: Microplastic abundance shows high variability inshorelines worldwide, but most studies fail to consider the spatiotemporal variability as a confounding factor in the interpretation of results. This study investigates the small-scale spatial and temporal variability of microplastic abundance, distribution, and composition in an urbanized estuary. The results show significant temporal variability but low spatial variability, with wind direction having the greatest effect on temporal microplastic variability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biodiversity Conservation
Liyin Qu, Ting Jiao, Weidong Guo, Randy A. Dahlgren, Nan Ling, Baoyi Feng
Summary: This study examined BEPOM in the Changjiang Estuary and adjacent areas in different seasons, identifying two humic-like and two protein-like components. The results showed variations in POM characteristics between seasons and regions, with different sources and transport pathways identified.
ECOLOGICAL INDICATORS
(2021)
Article
Environmental Sciences
Xiaosong Zhong, Maojun Yan, Wenqi Xu, Zhenwei Yan, Feng Xu, Shuhang Dong, Yu Xin, Xiaoyong Shi
Summary: Dissolved organic nitrogen (DON) is an essential component of marine nitrogen cycling, but studying its dynamics is challenging due to anthropogenic impacts and physical/biochemical gradients. This study focuses on the Changjiang Estuary and the East China Sea to investigate DON cycling using multiple isotopes and concentration data. The results reveal the active production and consumption of DON in specific zones.
FRONTIERS IN MARINE SCIENCE
(2022)
Review
Environmental Sciences
Tao Wang, Shiye Zha, Lixin Zhu, James C. McWilliams, Luisa Galgani, Roswati Md Amin, Ryota Nakajima, Wensheng Jiang, Mengli Chen
Summary: This Perspective discusses the occurrence, transformation, and impact of plastic waste in estuaries and highlights the importance of these processes in reducing plastic pollution. Large amounts of plastic waste enter the ocean through estuaries annually, where they accumulate, fragment, mix, and interact with organisms. The formation of microplastic hotspots in estuarine fronts could be a target for future plastic pollution mitigation efforts.
NATURE REVIEWS EARTH & ENVIRONMENT
(2022)
Article
Oceanography
Lei Zhu, Xiaodong Chen, Zhimo Wu
Summary: The study revealed changes in the exchange flow structure in the North Passage of Changjiang River Estuary after a deep waterway project, leading to a more pronounced vertically sheared pattern of exchange flow, with Coriolis playing a minor role in the process.
ACTA OCEANOLOGICA SINICA
(2021)
Article
Marine & Freshwater Biology
Xiaolu Wang, Ying Wu, Hui Wu, Guosen Zhang, Jie Jin, Lijun Qi, Xinyu Guo, Jinlong Dai, Zhaoru Zhang, Meng Zhou
Summary: This study developed a three end-member model to estimate the contributions of nutrients from different sources to phytoplankton production in the Changjiang Estuary and adjacent coastal region. The nutrient consumption and organic carbon production in onshore waters are mainly controlled by water mass mixing and turbidity maximum zones, while offshore waters are impacted by the Changjiang River plume and Taiwan Warm Current deep water.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Mathematics, Applied
Zvonimir Bujanovic, Daniel Kressner, Christian Schroeder
Summary: The study focuses on computing a more accurate Schur decomposition from a given approximate Schur decomposition, and proposes a Newton-like algorithm that exhibits local quadratic convergence on matrices with mutually distinct eigenvalues.
NUMERICAL ALGORITHMS
(2023)
Article
Chemistry, Physical
Philipp Honegger, Othmar Steinhauser, Christian Schroeder
Summary: Different spectroscopy types reveal different aspects of molecular processes in soft matter, with collective observables providing insights into intermolecular correlations. This perspective focuses on the interpretation of dielectric relaxation spectroscopy (DRS) utilizing computational spectroscopy. It discusses the history and recent advances of DRS in biomolecular hydration and nanoconfinement, while also providing guidance on utilizing collective spectroscopy types to understand soft matter phenomena.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Florian Joerg, Marcus Wieder, Christian Schroeder
Summary: Protex is an open-source program that allows for proton exchanges of solvent molecules during molecular dynamics simulations, enhancing traditional simulations by permitting bond breaking or formation. It provides an easy-to-use interface for defining multiple proton sites for (de-)protonation using a single topology approach. Protex has been successfully applied to a protic ionic liquid system and compared to simulations without proton exchange, showing accurate calculation of transport properties.
FRONTIERS IN CHEMISTRY
(2023)
Article
Oceanography
Yifei Luo, Jie Shi, Xinyu Guo, Xinyan Mao, Peng Yao, Bin Zhao, Lin Chen, Yucheng Wang
Summary: The intensity of Zhejiang coastal upwelling (ZCU) is the principal factor influencing the coastal primary productivity of the East China Sea (ECS) in summer, while the Kuroshio intrusion (KI) has a relatively smaller impact. Strong ZCU leads to higher nutrient concentrations and greater nutrient supplies in nearshore areas. The years 2013 and 2018 were identified as strong and weak ZCU years, respectively, with significant differences in nutrient concentrations and phytoplankton biomass.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Chemistry, Physical
Andras Szabadi, Aleksandar Doknic, Jonathan Netsch, Adam Mark Palvoegyi, Othmar Steinhauser, Christian Schroeder
Summary: We use polarizable molecular dynamics simulations to reproduce the infrared spectra of several ionic liquid cations and anions in the gas phase. Our results show that polarizable force fields provide a reasonable compromise between computational effort and accuracy for investigating IR spectra when treating the transition from gas to liquid phase carefully. The liquid phase not only changes the electrostatic environment of the molecules, but also introduces friction and intermolecular interactions, altering the IR spectrum significantly. Additionally, we tested the application of machine learning potentials in reproducing IR spectra but found that the main focus of this work is to improve the quality of polarizable force fields concerning vibrations rather than predicting IR spectra.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Ecology
Xing Chen, Jiwen Liu, Xiao-Yu Zhu, Chun-Xu Xue, Peng Yao, Liang Fu, Zuosheng Yang, Kai Sun, Min Yu, Xiaolei Wang, Xiao-Hua Zhang
Summary: This study provides a comprehensive characterization of the microbial community, metagenome, and metagenome-assembled genomes (MAGs) in the world's deepest yongle blue hole (YBH). It reveals the shifting composition and function of the microbial community across different zones, as well as the variations in carbon fixation processes and energy metabolisms. The findings deepen our understanding of carbon fixation and its biogeochemical impacts in relation to oxygen availability.
ISME COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ludovica Martina Epasto, Philipp Honegger, Kateryna Che, Fanny Kozak, Florian Joerg, Christian Schroeder, Dennis Kurzbach
Summary: Dissolution dynamic nuclear polarization (dDNP) is a versatile hyperpolarization technique to enhance signal intensities in nuclear magnetic resonance (NMR) spectroscopy. By dissolving biomolecules in hyperpolarized aqueous buffer under mild conditions, the scope of NMR has been expanded. However, the water-to-target hyperpolarization transfer mechanisms are still unclear, and the limited structural information is obtained due to the restricted data acquisition.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Andras Szabadi, Philipp Honegger, Flora Schofbeck, Marion Sappl, Esther Heid, Othmar Steinhauser, Christian Schroder
Summary: In this study, the thermal dependence of both structural and dynamic properties of two ionic liquids sharing the same cation was investigated using polarizable molecular dynamics simulations. It was found that the structure exhibited a linear temperature trend, while the dynamics showed an exponential Arrhenius-like behavior. The results cast doubt on common concepts such as the alternating shells of cations and anions, and highlight the importance of collectivity in the dynamic properties of ionic liquids.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Florian Joerg, Christian Schroeder
Summary: This study investigates the equilibrium between the neutral and charged species of the protic ionic liquid 1-methylimidazolium acetate, finding that despite experimental data indicating a preference for the neutral species, the system exhibits significant conductivity. By developing a polarizable force field and utilizing frequency-dependent dielectric spectrum, the equilibrium composition of the reaction mentioned above can be accurately determined.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Andras Szabadi, Christian Schroeder
Summary: Polarizable molecular dynamics simulations are a fast progressing field in the scientific research of ionic liquids. This review highlights recent developments in intermolecular interactions of induced dipoles and summarizes the application of polarizable simulations in studying ionic liquids.
JOURNAL OF COMPUTATIONAL BIOPHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Physical
Richard Jacobi, Florian Joerg, Othmar Steinhauser, Christian Schroeder
Summary: Proton transfer reactions play a crucial role in enhancing the conductivity of protic ionic liquids, but in a multicomponent system, multiple proton reactions can occur, resulting in a complex reaction network.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
