Surface CO2 partial pressure and air–sea CO2 flux on the China side of the South Yellow Sea based on multiple-year underway measurements during 2005–2011 and comparison with results for 2011–2018

Progress In Oceanography, Год журнала: 2025, Номер 234, С. 103466 - 103466

Опубликована: Март 16, 2025

Язык: Английский

---

Carbonate and isotope chemistry in the outer Yellow River Estuary and beyond: Effects of flood and cold wave on interannnual variations in coastal stable carbon isotope

Marine Chemistry, Год журнала: 2025, Номер 269, С. 104486 - 104486

Опубликована: Янв. 5, 2025

Язык: Английский

---

Seasonal variations and correlation analysis of water quality parameters in the Chambal River, Rajasthan, India

Water Environment Research, Год журнала: 2025, Номер 97(2)

Опубликована: Фев. 1, 2025

Abstract The study investigated the water quality of Chambal River from 2010 to 2022 throughout year. measured parameters like pH, EC (Electrical Conductivity), TDS (Total Dissolved Solids), and Total Hardness (TH) fluctuate between 7.70 8.35 (with an average 8), 289 484 μS/cm 347 μS/cm), 185 315 mg/l 224 mg/l), 68 120 93 respectively, on yearly basis. While turbidity, nitrate levels, ammonia nitrogen, fluoride, boron dissolved) 0.79 8 NTU 2 NTU), 0.38 0.92 0.06 0.61 0.22 0.24 0.94 0.67 0.04 0.33 0.16 Quality Index (WQI) ranges 10 149 with 73 a However, WQI 27 95 56) in summer, 6 294 116) rainy, 4 123 156) autumn, 1 82 52) winter. These results indicate poor overall Water (WQI), rendering River's unsuitable for drinking purposes. Furthermore, principal component analysis dendrogram were used this study. findings highlight urgent need stricter pollution control measures safeguard river's health. Practitioner Points present is based Seasonal Variations Correlation Analysis Parameters via multiparametric approaches year River, Rajasthan, India. Two types statistics (Principal Component Dendrogram analysis) have been applied here know variation distribution WQI. pH fluctuated within IS standard, slight summer alkalinity increase. remained stable, higher due evaporation. Turbidity peaked monsoon reduced dry periods. Poor was found sampling site hence reader discussed journal may take interest it. Urgent health different pollutants. Pearson correlation reveals strong positive correlations WQI, TDS, TH, while negative are observed these clusters concentration.

Язык: Английский

---

Seasonal Variation of Air‐Sea CO₂ Flux and Contribution of Biological Processes to Carbon Source/Sink in a Large River‐Dominated Shelf Sea

Journal of Geophysical Research Oceans, Год журнала: 2025, Номер 130(3)

Опубликована: Март 1, 2025

Abstract Productive shelf seas are often considered hotspots for absorbing atmospheric CO 2 . However, the contribution of biological processes to carbon source or sink remains unclear in global large river‐dominated seas. As a case study, we applied three end‐members mixing model quantify (including release from organic matter degradation by microbes and uptake phytoplankton) variations air‐sea flux (F) Changjiang plume‐impacted area (CPS). We also established 1‐D mass budget quantitatively assess factors controlling partial pressure dioxide ( p ) during seasonal transitions. Our results showed that CPS acted as summer (2.0 ± 13.9 mmol m −2 d −1 autumn (5.4 8.6 ), but winter (−6.8 9.4 spring (−1.0 4.8 ). Biological significantly influence variability. It is worth noting winter‐to‐spring transition, contributed 36% (the largest among four transition periods) decrease. In CPS, caused winter, spring, summer, 2.6 4.1, −15.1 22.0, 2.2 8.2, −2.0 4.9 , respectively, with relative contributions F 13.5%, −53.9%, 5.0%, −11.0%, respectively. These findings suggest dissolved inorganic continental enhance sequestration contribute mitigating warming.

Язык: Английский

---

Sedimentary Nitrate Respiration Potentially Offsets the Climatic Benefits From CO₂ Uptake by Marginal Seas

Geophysical Research Letters, Год журнала: 2025, Номер 52(6)

Опубликована: Март 22, 2025

Abstract Sediment nitrate respiration eliminates reactive nitrogen (Nr) and consumes organic carbon (OC) accompanying by CO 2 N O production to partially neutralize the climate benefit of sedimentary burial. The quantitative linkage between stoichiometry greenhouse potential this syndepositional process, particularly at a marginal sea scale, remains unexplored. Here we show that temperature matter co‐regulate sediment associated in China's seas. By establishing empirical equations, access 2.8 ± 0.4 Tg Nr (∼26.5% riverine input) is annually respired via degrading 2.2 0.2 OC (∼12.5% deposited) produce 15.0 3.5 Gg O‐N, which may counter‐balance 15.1 8.1% air‐sea influx. This link anthropogenic input removal sequestration reveals potentially reduces climatic benefits

Язык: Английский

---

Response of bottom dissolved oxygen reduction to net ecosystem production observed by a wave-driven profiler in the Changjiang River Plume

Marine Environmental Research, Год журнала: 2024, Номер 202, С. 106794 - 106794

Опубликована: Окт. 16, 2024

Язык: Английский

---

Surface carbonate dynamics in a temperate coastal system in the Northern Yellow Sea, China

Regional Studies in Marine Science, Год журнала: 2024, Номер 78, С. 103773 - 103773

Опубликована: Авг. 25, 2024

Язык: Английский

---