Article
Environmental Sciences
K. Solaimani, S. Bararkhanpour Ahmadi
Summary: This study analyzed the seasonal changes in precipitation using quantile regression method in different stations in northern Iran. The results showed different trend patterns for each season and extreme rainfall and flood events have been increasing.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Marine & Freshwater Biology
Mengqi Li, Nan Wang, Guangxue Li, Dehai Song, Yanzhen Gu, Xianwen Bao, Shidong Liu, Lei Zhang
Summary: Plume bulges were found in the Pearl River Estuary (PRE) during a flood-ebb tidal cycle, contrary to previous belief that estuaries with trumpet-like characteristics are less prone to form plume bulges. The formation dynamics and influences of discharge change on the plume bulge were revealed through simultaneous observations. The tidal plume was identified as the main component forming the plume bulge, rather than the surface-advected plume. Higher discharge enhanced the momentum and flux of the tidal plume, while lower discharge favored the formation of a surface-advected plume along the west bank.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Rebecca A. McPherson, Craig L. Stevens, Joanne M. O'Callaghan, Andrew J. Lucas, Jonathan D. Nash
Summary: Observations from a fast-flowing buoyant river plume in New Zealand showed that lateral spreading of the plume was driven by strong stratification and enhanced shear, with estimates derived from different methods yielding varying results. Surface drifters underestimated spreading rates, likely due to convergence of near-surface flow. Horizontal shear dispersion was identified as the dominant mechanism of dispersion, influencing spreading in the surface plume layer.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Mathematics
Harry Haupt, Markus Fritsch
Summary: This study focuses on the identification and estimation of trends in hydroclimatic time series. It provides an asymptotic justification for quantile trend regression modeling and explores its application in analyzing temperature anomalies. The results highlight the presence of heterogenous trends and an increase in the relative frequency of unusually high temperatures.
Article
Environmental Sciences
Haihang Zhi, Hui Wu, Jiaxue Wu, Wenxia Zhang, Yihe Wang
Summary: This study used the Pearl River plume as an example to analyze the spatiotemporal characteristics of river plume front using a numerical model. It found that the bottom front of the plume remains stable and rooted at a specific location, while the surface plume exhibits variability due to seasonal wind patterns. Runoff, wind, and tide were identified as major factors regulating the strength and position of the bottom front.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Gang Li, Lianfu Mei, Qing Ye, Xiong Pang, Jinyun Zheng, Wendi Li
Summary: This study systematically analyzes the three stages of faulting evolution in the northern margin of the South China Sea, based on the latest seismic and drilling data. The faults in each stage showed different migration tendencies, activities, and control mechanisms. The quantities, lengths, trends, and dip angles of the faults also changed significantly from Stage I to Stage III.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Haiju Hu, Gedun Chen, Rui Lin, Xing Huang, Zhidong Wei, Guoheng Chen
Summary: Saltwater intrusion is a significant issue in coastal areas worldwide, posing a serious threat to freshwater quality. This study analyzed observed data from nine stations in the Modaomen waterway, the largest inlet of the Pearl River estuary, over a 10-year period. The results showed that the duration of saltwater intrusion varied spatially and was inversely related to the distance from the estuary mouth. Additionally, a multiple linear regression analysis indicated that river discharge and relative sea level were the dominant factors influencing saltwater intrusion.
Article
Environmental Sciences
Alexander Osadchiev, Alexandra Gordey, Alexandra Barymova, Roman Sedakov, Vladimir Rogozhin, Roman Zhiba, Roman Dbar
Summary: This study focuses on the instabilities at the interfaces between small river plumes and ambient seawater. High-resolution aerial remote sensing and in situ measurements are used to examine these instabilities. Both Rayleigh-Taylor and Kelvin-Helmholtz instabilities are observed, inducing mass transport and modifying the salinity structure and mixing at the plume-sea interfaces. Additionally, wind-driven Stokes transport affects the spread of river-borne floating particles.
Article
Geochemistry & Geophysics
Hualong Jin, Shiming Wan, Peter D. Clift, Chang Liu, Jie Huang, Shijun Jiang, Mengjun Li, Lin Qin, Xuefa Shi, Anchun Li
Summary: This study reconstructs the evolutionary history of the Pearl River using new analytical results, including clay mineral assemblages and Sr-Nd isotopic compositions. The research reveals that the modern-scale Pearl River was fully developed at least 30 million years ago and started delivering sediments to the northern South China Sea.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Water Resources
Khalil Ghorbani, Meysam Salarijazi, Sedigheh Bararkhanpour, Laleh Rezaei Ghaleh
Summary: This research used Bayesian and quantile regression techniques to analyze the trends in discharge levels across different seasons in the Gorganroud basin of northern Iran. The study covered a 50-year period (1966-2016). The results showed a decrease in high discharge rates during spring for the Arazkouseh and Galikesh stations, with a steep slope of -0.31 m(3)/s per year for Arazkouseh and -0.19 and -0.17 for Galikesh. On the other hand, the Tamar station experienced an increase in very high discharge rates during summer, with a slope of 0.12 m(3)/s per year. The findings highlight the importance of quantile regression models in predicting and managing extreme discharge changes, reducing the risk of flood and drought damage.
JOURNAL OF WATER AND CLIMATE CHANGE
(2023)
Article
Environmental Sciences
Wei Zou, Guangwei Zhu, Hai Xu, Mengyuan Zhu, Boqiang Qin, Yunlin Zhang, Yonghong Bi, Miao Liu, Tianhao Wu
Summary: Knowledge of phytoplankton limiting factors is crucial for cost-efficient lake eutrophication management. This study proposes a statistical framework to explore site-specific phytoplankton limiting factors and their dependence on water depth (WD), providing valuable information for formulating context-dependent bloom control and developing cost-efficient eutrophication management strategies.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Wei Zou, Guangwei Zhu, Hai Xu, Mengyuan Zhu, Boqiang Qin, Yunlin Zhang, Yonghong Bi, Miao Liu, Tianhao Wu
Summary: This study explored the limiting factors of phytoplankton in 54 lakes in the Chinese Eastern Plains ecoregion, identifying N, P, N+P, light availability, rapid flushing, abundant macrophytes, and unmeasured factors as contributing to the limitation in different sites.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Oceanography
Bingxu Geng, Peng Xiu, Na Liu, Xianqiang He, Fei Chai
Summary: This study found that the anomalously strong phytoplankton bloom in the slope region of the northern South China Sea was triggered by the interaction between locally transported nutrients from subsurface and the eddy edge, which led to enhanced frontal dynamics and injection of nutrients from subsurface to surface layer, stimulating phytoplankton growth in the upper layer. The findings suggest that the eddy-entrained freshwater could have significant biological consequences by modifying local dynamics in the plume-influenced region.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Guiyuan Dai, Guizhi Wang, Qing Li, Ehui Tan, Minhan Dai
Summary: The study found that submarine groundwater discharge is a significant nutrient and carbon source on the western shelf of the northern South China Sea, more important than upwelling and second only to the Pearl River. The results suggest that SGD plays a crucial role in the biogeochemical processes of the shelf and should be considered in future research and management efforts.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Ruiming Wu, Hui Wu, Yihe Wang
Summary: This study used a numerical model to investigate the influence of river plumes on the circulation of East Asian Marginal Seas, finding that riverine freshwater discharge can alter density structure and dynamic height of the receiving seas, thus affecting shelf circulation. Both the Changjiang and Pearl Rivers play important roles in regulating the East China Sea shelf circulation, particularly in modifying the coastal current and the Taiwan Warm Current.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Marine & Freshwater Biology
Ting Zhang, Canchuan Zhang, Jin Zhang, Jiangtian Lin, Dongdong Song, Peng Zhang, Yang Liu, Lizhao Chen, Li Zhang
Summary: This study reveals the molecular mechanisms of cadmium toxicity on the early development of the swim bladder in zebrafish. Cadmium exposure inhibits Wnt and Hedgehog signaling pathways, disturbs surfactant lipid distribution, and impairs the formation of the swim bladder's tissue layers, leading to developmental defects.
AQUATIC TOXICOLOGY
(2022)
Article
Environmental Sciences
Qingxia Liu, Linbin Zhou, Wanru Zhang, Li Zhang, Yehui Tan, Tingting Han, Ming Dai, Xiuli Liao, Honghui Huang
Summary: The study investigated the effects of temperature on the ingestion and assimilation rates of algal food by Creseis acicula near the Daya Bay Nuclear Power Plant. Results showed that higher temperatures led to increased ingestion of algal food, improved assimilation efficiency, and faster growth of the zooplankton.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
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
Dongdong Song, Lizhao Chen, Siqi Zhu, Li Zhang
Summary: The presence of gut microbiota, especially arsenic-resistant bacteria such as Stenotrophomonas maltophilia, plays an important role in the accumulation and transformation of arsenic in fish. Removing the gut microbiota through antibiotic treatment significantly reduces the levels of total arsenic and arsenobetaine in the intestines and muscles of fish. Arsenic exposure alters the composition of the fish gut microbiota, with S. maltophilia becoming the dominant species. In vitro experiments demonstrated that the gut contents of untreated fish can metabolize arsenate to arsenite and organoarsenicals, while antibiotic-treated fish lose this ability.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Qingxia Liu, Linbin Zhou, Yun Wu, Honghui Huang, Xuejia He, Na Gao, Li Zhang
Summary: This study proposes a carbon release model that divides fish-released carbon into two sources (ingested food and fish body), and three forms (DOC, CO2, and PC). By feeding radiocarbon-labeled living rotifer to marine fish Oryzias melastigma, the daily carbon budget was quantified. The results show that a substantial proportion of ingested food carbon was absorbed, assimilated, and released as DOC, CO2, and PC. Fish body carbon was also dissimilated and released at a certain rate, with different proportions of DOC, CO2, and PC.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Qingling Wang, Chenmin Xie, Chuyue Long, Weiyan Yang, Yan Wang, Weihai Xu, Li Zhang, Yuxin Sun
Summary: The study found significant differences in PCBs and DDTs concentrations among the six biota species from Qilianyu Island. The levels of PCBs and DDTs in intermediate egret were significantly higher than the other five biota species, likely due to their different feeding and living habits. The study also confirmed that dietary source is an important factor in determining the levels of PCBs and DDTs in biota species, and biomagnification of contaminants occurred in the native species on the island.
Article
Environmental Sciences
Dongdong Song, Siqi Zhu, Lizhao Chen, Ting Zhang, Li Zhang
Summary: In this study, the genome of an As-resistant bacterium strain S. maltophilia was sequenced and its arsenic metabolism strategy was investigated. The bacterium transformed As(V) to organic arsenicals, reduced As accumulation, and synthesized less toxic AsB. The heterologous expression of specific genes increased resistance in E. coli. This study also revealed the potential synthetic pathway of AsB in bacteria, improving our understanding of As toxicology in microorganisms.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Qunhuan Ma, Lizhao Chen, Li Zhang
Summary: This study investigates the effects of phosphate on the toxicity and bioaccumulation of arsenic in marine microalgae. The results show that elevated phosphate concentrations can suppress arsenic toxicity and affect its bioaccumulation. These findings help enhance our understanding of the impact of eutrophication on arsenic in the marine environment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Weikang Zhan, Qingyou He, Ying Zhang, Haigang Zhan
Summary: By analyzing 27 years of eddy and tropical cyclone data, a study found that mesoscale ocean eddies significantly affect the formation of tropical cyclones. During the off-season months in the western North Pacific, there were more tropical cyclones generated over anticyclone eddies compared to cyclone eddies, and they were located further north. The study also showed that there is a higher probability of tropical cyclone genesis over anticyclone eddies, especially under cooler oceanic conditions. These findings suggest the importance of considering the impacts of ocean eddies in air-sea models for better forecasting of regional tropical cyclone activities.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Marine & Freshwater Biology
Yun Wu, Chenchen Zuo, Wei Zhang, Li Zhang
Summary: This study found that selenium can alleviate the toxicity of heavy metals cadmium and copper in the red macroalga Gracilaria lemaneiformis. Low levels of selenium can reduce cadmium accumulation and alleviate the associated growth inhibition, while high levels of selenium can increase copper accumulation and induce metal chelators to alleviate growth inhibition. Selenium addition also alters metal subcellular distribution in the algae, which may affect subsequent metal trophic transfer.
AQUATIC TOXICOLOGY
(2023)
Article
Food Science & Technology
Canchuan Zhang, Xi Miao, Sen Du, Ting Zhang, Lizhao Chen, Yang Liu, Li Zhang
Summary: This study evaluated the effects of culinary procedures on the concentrations and bioaccessibility of trace elements in common food ingredients. The results showed that cooking procedures reduced the retention rate of arsenic and the bioaccessibility of copper and zinc, leading to a decrease in the total bioaccessible fraction of these elements in food ingredients. These findings suggest that culinary procedures reduce the absorption of copper, zinc, and arsenic in food ingredients, which should be considered in future studies related to nutrition and risk assessment of trace elements.
Article
Engineering, Environmental
Qunhuan Ma, Li Zhang
Summary: In this study, the uptake, bioaccumulation, subcellular distribution, and biotransformation of arsenate (As(V)) were assessed in two marine microalgae species, Skeletonema costatum and Amphidinium carterae, cultured in dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP). The results showed that As(V) was more toxic in DOP cultures than in DIP cultures, and higher As accumulation contributed to more severe toxicity. The uptake kinetics of As(V) followed Michaelis-Menten kinetics, with higher maximum uptake rates in DOP cultures. Additionally, the study found that DOP affected the half-saturation constants differently in the two species. S. costatum maintained constant constants, while A. carterae showed a decrease after P addition. The long-term exposure also revealed species-specific effects, with A. carterae accumulating more As and undergoing only As(V) reduction, while S. costatum showed As(V) reduction and transformation into organic As species, which was inhibited in DOP cultures. Overall, this study provides new insights into the relationship between As contamination and eutrophication based on marine microalgae.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Canchuan Zhang, Sen Du, Qunhuan Ma, Li Zhang
Summary: This study investigated the distribution of copper (Cu) in cytosolic proteins (CPs) in the gills of oysters through size-exclusion chromatography. It was found that the Cu concentrations in CPs were 8.6 times higher in oysters with high Cu concentrations compared to low concentrations. The study also revealed the critical role of macromolecular protein complexes in binding excess Cu in oysters.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Pai Peng, Jieshuo Xie, Hui Du, Shaodong Wang, Pu Xuan, Guanjing Wang, Gang Wei, Shuqun Cai
Summary: Two internal solitary waves (ISWs) with long fronts in the northern South China Sea (NSCS) were analyzed comparatively based on oceanic reanalysis data and the Korteweg-de Vries (KdV) theory. The study examined the differences in environmental parameters, wave width, and wave amplitude between the two ISW fronts in distinct oceanic environments. The results showed that the presence of a weak westward surface current led to increased linear wave speed and decreased ISW amplitude, while a relatively strong eastward surface current resulted in decreased linear wave speed and increased ISW amplitude. However, it was found that the ISW amplitudes reached their maximums at around 21°N and decreased towards the southern and northern sides regardless of the background environments.
Article
Oceanography
Jianwei Niu, Jieshuo Xie, Shicheng Lin, Pengzhi Lin, Fei Gao, Jian Zhang, Shuqun Cai
Summary: Data from a field observation of the Yellow River Delta showed that wave-induced liquefaction events during winter winds lead to the formation of a fluid mud layer (FML). The thickness of the FML is influenced by wave height and water depth. Sediment erosion rate is not only affected by wave-induced bottom shear stress, but also by excess pore pressure buildup and sediment liquefaction in liquefaction zones. Erosion rate in liquefaction zones can be 5-10 times higher than in non-liquefaction conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
