Effects of typhoon events on coastal hydrology, nutrients, and algal bloom dynamics: Insights from continuous observation and machine learning in semi-enclosed Zhanjiang Bay, China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 924, P. 171676 - 171676

Published: March 12, 2024

Language: Английский

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Characteristics and Mechanisms of Ocean Fronts‐Induced Decomposition of Particulate Organic Matter and Its Implication for Marine Carbon Burial

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(2)

Published: Feb. 1, 2025

Abstract Ocean fronts are dynamic regions that significantly influence marine biogeochemical processes and climate change. Despite their importance, there is limited research on the dynamics of particulate organic matter (POM) at these fronts, limiting our understanding carbon burial mechanisms in such environments. Here, we investigated seasonal physicochemical parameters stable isotopes POM Beibu Gulf to explore how ocean affect fate. During non‐frontal periods, notably summer fall, microbial consumption minimal due strong stratification, resulting partial mineralization middle deep waters only. In contrast, frontal formations during winter enhance decomposition POM. northern region with shallower water, intense vertical mixing induces upwelling nutrient‐rich deeper stimulating phytoplankton growth enhancing production fresh This accompanied by significant (94%) POM, driven oxygen replenishment from photosynthesis mixing. eastern region, its waters, restricted nutrient availability limits growth, more aging However, still reaches 73% active Therefore, regardless occurrence blooms within areas, identified as a prevailing process, reducing potential for challenging traditional theories depict solely sinks. comprehensive study sheds light biological pump highlights role sources.

Language: Английский

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A stable-carbon-isotope-based constrain of bulk particulate organic carbon dynamics and budgets in the Yellow Sea: Combining field surveys and isotope fractionation modeling

Progress In Oceanography, Journal Year: 2025, Volume and Issue: unknown, P. 103477 - 103477

Published: April 1, 2025

Language: Английский

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Field evidence and modeling validation of biogeochemical controls on the deposition of persistent organic pollutants in the deep ocean

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136395 - 136395

Published: Nov. 4, 2024

Language: Английский

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Pyrogenic PAHs Have Different Biogeochemical Fates in the Eastern Indian Ocean

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Understanding the fate of polycyclic aromatic hydrocarbons (PAHs) in deep ocean is crucial for elucidating biogeochemical cycle organic carbon under anthropogenic influences. In this study, surface sediments were collected from sea Eastern Indian Ocean (water depth: 2161–4545 m) and analyzed 29 semivolatile compounds (SVOCs), including parent PAHs their alkylated derivatives, as well source biomarkers. The target SVOCs (∑29SVOCs: 23.0–183 ng/g, ∑16PAHs: 11.3–93.3 ng/g) mainly pyrogenic sources, namely coal combustion, traffic emissions, wood burning. contributions burning combustion exhibited distinct trends with increasing total contents, suggesting different dominant behaviors. Major fractions can be biodegraded or photodegraded, leading to a depletion-dominated water column. Conversely, showed an accumulation-dominated via sedimentation due persistence hydrophobicity. This study highlights fates biomass fossil fuel oceans has implications marine refractory impacts.

Language: Английский

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The Seasonal Effect of Coastal Current and Upwelling on the Dynamics of Dissolved Organic Matter in the Northwestern South China Sea

Journal of Geophysical Research Oceans, Journal Year: 2024, Volume and Issue: 129(7)

Published: June 27, 2024

Abstract Previous studies have primarily focused on the impact of human activities coastal dissolved organic matter (DOM) cycles, while neglecting role dynamic processes. This limits our comprehensive understanding processes DOM, particularly in waters affected by multiple In this study, dynamics DOM northwestern South China Sea (SCS) were investigated using DOM‐related parameters and a three end‐member mixing model, which accounted for effects currents upwelling during spring, summer, winter seasons. Our results demonstrated that net addition was predominantly observed nearshore all seasons, owing to strong induced phytoplankton production particle desorption. However, weaker spring winter, removal decomposition western offshore area. observation can be attributed abundance microorganisms increased vertical water winter. Conversely, stronger provided more bio‐refractory limiting its decomposition, whereas stimulated productivity desorption, resulting period. eastern area, primary mechanism eliminating weak or absent upwelling. study revealed is widespread regions SCS facilitate DOM.

Language: Английский

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Response of particulate organic matter dynamics to the ocean front induced by typhoon Talim in Zhanjiang Bay

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 202, P. 106784 - 106784

Published: Oct. 11, 2024

Language: Английский

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