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

Xuan Lu,

Qibin Lao, Chao Wang

и другие.

Journal of Geophysical Research Oceans, Год журнала: 2024, Номер 129(7)

Опубликована: Июнь 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.

Язык: Английский

Interactions between particulate organic matter and dissolved organic matter in a weak dynamic bay revealed by stable isotopes and optical properties DOI Creative Commons
Xuan Lü, Chao Wang, Qibin Lao

и другие.

Frontiers in Marine Science, Год журнала: 2023, Номер 10

Опубликована: Фев. 21, 2023

Few studies have incorporated the tools of stable isotopes and optical properties to study biogeochemical process organic matter (OM), including particulate (POM) dissolved (DOM), which prevents our comprehension interactions between POM DOM in marine environment. In this study, origin, distribution, fate Tieshangang Bay, a weak dynamic bay were investigated by measuring δ 13 C 15 N POM, carbon (DOC), absorption fluorescence (CDOM FDOM). upper bay, source was mainly originated from terrestrial discharge, whereas high index (FI) indicated that external aquatic organism activity dominated sources. contrast, outer slightly increased enriched enhanced intensities protein-like components considerable contributions situ biological activities OM. A net addition DOC occurred both bays. The decomposition responsible for due dynamics primary production strong freshly produced jointly contributed bay. Our suggests hydrodynamics regulate biogeochemistry

Язык: Английский

Процитировано

5
Hydrological connectivity controls on the dynamics of particulate organic matter in a semi-enclosed mariculture bay DOI

Aiqin Han,

Jin‐Yu Terence Yang, Mengli Chen

и другие.

Aquaculture, Год журнала: 2023, Номер 578, С. 740109 - 740109

Опубликована: Сен. 22, 2023

Язык: Английский

Процитировано

5
Interannual variability in particulate organic matter distribution and its carbon stable isotope signatures from the western Indian shelf waters DOI
Saumya Silori, Haimanti Biswas, Mintu Chowdhury

и другие.

The Science of The Total Environment, Год журнала: 2022, Номер 844, С. 157044 - 157044

Опубликована: Июнь 30, 2022

Язык: Английский

Процитировано

7
Sources and fates of particulate organic matter in inland waters with complex land use patterns DOI
Huijun Ye, Changyuan Tang, Yingjie Cao

и другие.

The Science of The Total Environment, Год журнала: 2023, Номер 877, С. 162568 - 162568

Опубликована: Март 6, 2023

Язык: Английский

Процитировано

4
Remote Sensing Estimates of Particulate Organic Carbon Sources in the Zhanjiang Bay Using Sentinel-2 Data and Carbon Isotopes DOI Creative Commons
Guo Yu,

Yafeng Zhong,

Sihai Liu

и другие.

Remote Sensing, Год журнала: 2023, Номер 15(15), С. 3768 - 3768

Опубликована: Июль 28, 2023

The source information of coastal particulate organic carbon (POC) with high spatial and temporal resolution is great significance for the study marine cycles biogeochemical processes. Over past decade, satellite ocean color remote sensing has greatly improved our understanding spatiotemporal dynamics concentrations. However, due to complexity POC sources, methods sources have not yet been established. With an attempt fill gap, this developed algorithm retrieving using geochemical isotope technology. end-member mixing model was used calculate proportion response relationship between in situ reflectance (Rrs) established develop a retrieval following four bands: (Rrs(443)/Rrs(492)) × (Rrs(704)/Rrs(665)). results showed that four-band performed well R2, mean absolute percentage error (MAPE) root square (RMSE) values 0.78, 33.57% 13.74%, respectively. Validation against data derived calculated accurately, MAPE RMSE 27.49% 13.58%, accuracy verified based on Sentinel-2 data, 28.02% 15.72%, Additionally, we found higher outside Zhanjiang Bay than inside it survey which consistent retrieved results. Influencing factors may be occurrence phytoplankton blooms bay impact terrestrial inputs bay. Remote combination isotopes provides important technical assistance comprehending process uncovering variations their underlying causes.

Язык: Английский

Процитировано

4
Nitrogen and phosphorus emissions to water in agricultural crop-animal systems and driving forces in Hainan Island, China DOI

Xu Liang,

Yanhu He,

Lirong Zhu

и другие.

Environmental Science and Pollution Research, Год журнала: 2022, Номер 29(56), С. 85036 - 85049

Опубликована: Июль 5, 2022

Язык: Английский

Процитировано

6
External forcing mechanisms controlling the Qiongdong upwelling in the northern South China Sea during the Holocene DOI
Chao Huang, Yin Yang, Fajin Chen

и другие.

Global and Planetary Change, Год журнала: 2022, Номер 220, С. 104021 - 104021

Опубликована: Дек. 22, 2022

Язык: Английский

Процитировано

4
High-resolution record of temporal change in organic matter burial over the past ∼8,600 years on the northwestern continental slope of the South China Sea DOI Creative Commons
Gang Tong, Lilei Chen, Guangxu Zhang

и другие.

Frontiers in Earth Science, Год журнала: 2023, Номер 11

Опубликована: Авг. 17, 2023

Sedimentary organic matter (SOM) on continental slopes in marine regions can sensitively record climatic and environmental changes. In this study, total carbon content (TOC), nitrogen (TN), their stable isotope compositions (δ 13 C δ 15 N) for sediments of core G02 were investigated (at ∼24.2-year resolution) to reveal the temporal variations sources main controls distribution buried northwestern slope South China Sea over last ∼8600 years. Results a binary mixing model that ∼82.3 ± 3% SOM is derived from autochthonous sources. We suggest contents are governed by distinct factors. The more positive N values before Pulleniatina Minimum Event occurrence ascribed stronger subsurface water intrusion Kuroshio Current, which led enhanced denitrification turn counteracted effect with surface caused East Asian winter monsoon. show fluctuant decrease during ca. 8.6–3.0 cal kyr BP conspicuous increase 3.0–1.4 BP. These changes attributed productivity induced continuous weakening monsoon terrigenous input weakened Indian summer precipitation, respectively. Since 1.4 BP, human activities have become dominant factor controlling production carbon. results provide an important basis understanding source-sink processes factors influencing these low-latitude marginal seas.

Язык: Английский

Процитировано

2
Spatial and temporal variations in trophic structure of fish assemblages in the Yellow Sea revealed by C and N stable isotopes DOI

Donghoon Shin,

Tae Hee Park, Dongyoung Kim

и другие.

Marine Pollution Bulletin, Год журнала: 2023, Номер 196, С. 115678 - 115678

Опубликована: Окт. 19, 2023

Язык: Английский

Процитировано

2
Physiological and Biochemical Responses of Kandelia obovata to Upwelling Stress DOI Open Access
Xiaomei Li, You‐Shao Wang,

Junde Dong

и другие.

Water, Год журнала: 2022, Номер 14(6), С. 899 - 899

Опубликована: Март 13, 2022

Mangroves growing in intertidal areas are faced with various stresses caused by coastal human activities and oceanic atmospheric sources. Although the study of physiological biochemical characteristics mangroves has been developing over past four decades, effect upwelling on plants stress resistance seldom investigated. Here, changes leaves Kandelia obovata seedlings response to were investigated (air temperature: 25 °C; water control °C, 13 5 salinity: 10‰). The results revealed that treatment an increase chlorophyll content but a decrease photosynthetic fluorescence parameters. Hydrogen peroxide (H2O2) production malondialdehyde activity (MDA) increased temperature. proline under stress, whereas soluble sugar decreased. Further, antioxidant enzymes, such as superoxide dismutase (SOD) peroxidase (POD), showed increasing trend during treatment, while catalase (CAT) It was evidenced triggered responses seedlings. This became more intense temperature decreased, all these indicators different stress. Through synthesizing energy regulating enzyme osmotic pressure, K. formed mechanism short-term upwelling.

Язык: Английский

Процитировано

3