Radium-Derived Water Mixing and Associated Nutrient in the Northern South China Sea DOI Creative Commons
Jianan Liu, Jinzhou Du, Ying Wu

et al.

Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 9

Published: April 28, 2022

Nutrients play an important role as biogenic elements in modulating marine productivity, and water mixing usually facilitates the transportation of nutrients coastal ocean. In this study, distributions naturally occurring radioisotopes 226 Ra 228 surface column northern South China Sea (NSCS) have been investigated to estimate oceanic nutrient supplies. We identified three masses Warm Current (SCSWC), Branch Kuroshio (SCSBK), shelf summer June 2015, but only SCSWC SCSBK were observed spring March 2017. The fraction was estimated be average 0.25 ± 0.16, which lower than that 0.57 0.32 our study area. horizontal from Pearl River plume revealed eddy diffusion (1.2 0.79) × 10 5 cm 2 /s advection velocity ω 0.16 cm/s slope region. column, best-fit exponential curve gradient led a vertical coefficient 0.43 0.33 went down subsurface upper 1,000 m, upward 18 9.9 near-bottom. Combining distributions, carried (5.6 4.9) mmol N/m /d, 2.2 2.0 P/m (4.1 3.9) Si/m /d very layer, suggesting plays significant sources NSCS during 2015. supplied 2.7 1.6 0.18 0.11 15 8.4 appeared more atmospheric deposition rivaled submarine groundwater discharge.

Language: Английский

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes DOI
Qibin Lao, Shuwen Zhang, Zhiyang Li

et al.

Journal of Geophysical Research Oceans, Journal Year: 2022, Volume and Issue: 127(7)

Published: July 1, 2022

Abstract A new data set of seasonal stable water isotopes (δD and δ 18 O) temperature‐salinity profiles was applied to improve our understanding mass distributions their impact on the environment Beibu Gulf (BG). Our study revealed that coastal current (CC), West‐Guangdong (WGCC), South China Sea (SCSW) were three dominant masses in BG, influence exhibited variations. The CC contributor BG during summer (43%) fall (45%), while it changed intrusion SCSW with higher salinity winter (57%). contribution WGCC relatively seasons (24%–31%). In addition, nutrients greatly affected by different mixing occurring gulf. mainly originated from (52%–68%) (32%–69%), source shifted (36%–69%). Moreover, loading (15%–49%) high due its (57%) winter. These indicated has a input external sustain primary production BG. uses dual quantify nutrients, providing method distribution

Language: Английский

Citations

86
Increasing intrusion of high salinity water alters the mariculture activities in Zhanjiang Bay during the past two decades identified by dual water isotopes DOI
Qibin Lao, Junhui Wu, Fajin Chen

et al.

Journal of Environmental Management, Journal Year: 2022, Volume and Issue: 320, P. 115815 - 115815

Published: Aug. 1, 2022

Language: Английский

Citations

44
A comparative study on source of water masses and nutrient supply in Zhanjiang Bay during the normal summer, rainstorm, and typhoon periods: Insights from dual water isotopes DOI
Qibin Lao, Xuan Lü, Fajin Chen

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 903, P. 166853 - 166853

Published: Sept. 8, 2023

Language: Английский

Citations

26
Effects of upwelling and runoff on water mass mixing and nutrient supply induced by typhoons: Insight from dual water isotopes tracing DOI
Qibin Lao,

Xuan Lu,

Fajin Chen

et al.

Limnology and Oceanography, Journal Year: 2022, Volume and Issue: 68(1), P. 284 - 295

Published: Nov. 21, 2022

Abstract The issue of whether the increase in nutrients is supplied by increasing runoff or enhancing upwelling coastal marine ecosystems after a typhoon considered controversial. This because it relatively difficult to quantify water mixing using traditional methods. Dual isotopes northwestern South China Sea during Typhoon Wipha (July–August 2019) were investigated address this issue. Weak among different masses was observed before strong thermal stratification. After typhoon, temperature and salinity dropped column, particularly upper layer (<20 m), due strengthened mixing. Mixing predominantly originated from diluted (36%) nearshore, whereas changed (51%) offshore. Upwelling stronger on right path (50%) than left (36%). Nutrients input nearshore layer, while occurred (53%) nutrient supply (43%) also more considerable that (25%). study suggests typhoon‐induced layers (38%) substantial (30%), providing new insight into biogeochemical ecological responses systems typhoons.

Language: Английский

Citations

36
Tracks of typhoon movement (left and right sides) control marine dynamics and eco-environment in the coastal bays after typhoons: A case study in Zhanjiang Bay DOI

Chunqing Chen,

Qibin Lao, Xin Zhou

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 168944 - 168944

Published: Dec. 1, 2023

Language: Английский

Citations

12
Late Aptian–middle Albian bacinellid oncoid event, Apuseni Mountains, Romania: A possible link to OAE1b? DOI
George Pleş, Ioan I. Bucur,

Emanoil Săsăran

et al.

Palaeogeography Palaeoclimatology Palaeoecology, Journal Year: 2025, Volume and Issue: unknown, P. 112807 - 112807

Published: Feb. 1, 2025

Language: Английский

Citations

0
Vertical circulation and heat flux of coastal ocean fronts in the northwestern South China Sea DOI
Keyi Tan,

Lingling Xie,

Junyi Li

et al.

Continental Shelf Research, Journal Year: 2025, Volume and Issue: unknown, P. 105478 - 105478

Published: April 1, 2025

Language: Английский

Citations

0
Mechanisms of Elevated Sulfate Concentrations in High Geotemperature Coal Mining Areas DOI
Yuanmeng Li

International Journal of Natural Resources and Environmental Studies, Journal Year: 2025, Volume and Issue: 5(3), P. 79 - 86

Published: April 25, 2025

Sulfate (SO₄²⁻) contamination in groundwater within mining areas has garnered widespread global attention, while prolonged coal activities have further complicated geological conditions and hydrogeochemical environments. This study investigates the sources evolution of SO₄²⁻ Pingdingshan area based on multi-year hydrochemical data. Key findings are as follows:Ion correlation analysis demonstrates that cation exchange between Na⁺ Ca²⁺/Mg²⁺ dominates processes groundwater; Spatiotemporal sulfate variations, analyzed through data statistical methods, reveal concentrations sandstone aquifer exhibit most significant fluctuations under impacts, whereas phreatic limestone oscillate a range 200 mg/L; Comparative (high geotemperature area) Jiaozuo (ambient-temperature regions indicates elevated geotemperature, water circulation, water-rock interactions enhance mineral dissolution sulfide oxidation, leading to anomalously high elucidates migration mechanisms area, providing critical insights for mitigating systems North China.

Language: Английский

Citations

0
Isotopic compositions (δD, δ18O) and end-member mixing for the control interface in a complex tidal region DOI
Rongrong Xie, Zhen Ling, Xianzhong Wu

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 866, P. 161438 - 161438

Published: Jan. 6, 2023

Language: Английский

Citations

5
Changes in hydrodynamics and nutrient load of the coastal bay induced by Typhoon Talim (2023) DOI Creative Commons

Chunqing Chen,

Qibin Lao, Xin Zhou

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: March 27, 2024

Typhoons can greatly alter the hydrodynamic and nutrient supply in coastal oceans. However, due to complex conditions of typhoons, such as their intensity, even slight changes may cause substantial hydrodynamics supply, which needs be better understood. In this study, we conducted two cruises before after Typhoon Talim (2023) quantitatively investigate Zhanjiang Bay using dual water isotopes. Before typhoon, strong stratification occurred bay. external force typhoon destroyed substantially changed mixing bay typhoon. upper bay, massive freshwater input remarkably decreased salinity during post-typhoon period (freshwater increased by 18%). contrast, variation lower was minimal, mainly seawater intrusion from outer induced typhoon; mixed with columns forming a ocean front. The intensity fronts typhoons directly depended on landing Bay, stronger will more high-salinity Due formation front, terrestrial nutrients are prevented being transported downwards, resulting large amount accumulated pollutants within By impact intrusion, contribution has increased, thereby diluting This study provides new insight into responses marine eco-environment systems typhoons.

Language: Английский

Citations

1