Seasonal variation of sea surface pH and its controls in the Jiaozhou Bay, China

Li, Yunxiao; Yang, Hong; Dang, Jiajia; Yang, Xufeng; Xue, Liang; Zhang, Longjun

doi:10.1016/j.csr.2021.104613

Cited by 7 publications

(3 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where DDIC p-d , DDIC bio , and DDIC a-s represent DIC changes caused by CaCO 3 precipitation-dissolution, biological, and sea-air exchange processes, respectively; DAlk p-d and DAlk bio represent Alk changes caused by the processes of CaCO 3 precipitationdissolution and biological processes, respectively; and −17/106 × DDIC bio is the expected Alk change during the biological use or release of DIC assuming the Redfield ratio (Redfield et al, 1963). Considering that the change in Alk from biological processes is relatively minor compared to changes in DIC, the biological term was ignored in practice according to previous studies (Xue et al, 2016;Li et al, 2022;Zhang and Hu, 2023).…”

Section: Calculations For Separating Dic Controlling Processesmentioning

confidence: 99%

Distributions and controlling processes of the carbonate system in the Eastern Indian Ocean during autumn and spring

Wu,

Yuan,

Liu

et al. 2024

Front. Mar. Sci.

View full text Add to dashboard Cite

The Eastern Indian Ocean (EIO) is an ideal region to explore the variability and controlling mechanisms of the seawater carbonate system and their potential influence on global climate change due to the distinctive environmental features, while studies in the EIO is far from sufficient. The spatiotemporal distributions of pH, dissolved inorganic carbon (DIC), alkalinity (Alk), and partial pressure of carbon dioxide (pCO2) were investigated in the EIO during autumn 2020 and spring 2021. The respective quantitative contributions of different controlling processes to DIC were further delineated. Significant seasonal variations were observed in the study area. Overall, the surface pH was lower and DIC, Alk, and pCO2 were higher during spring 2021 than during autumn 2020. The pH generally decreased from east to west during autumn 2020, whereas it decreased from north to south during spring 2021. The low values of DIC and Alk that were detected in the Bay of Bengal in these two seasons were mainly attributed to the influence of river inputs. Coastal upwelling during monsoon periods led to higher pCO2 and DIC values near Sumatra and Sri Lanka during spring 2021. The relationships of carbonate system parameters with different types of nutrients and different sized chlorophyll-a in the two seasons indicated the shifts of nutrients utilized by the phytoplankton, and phytoplankton species dominated the carbonate system variabilities. In vertical profiles, carbonate system parameters showed strong correlations with other physical and biogeochemical parameters, and these correlations were more robust during spring 2021 than during autumn 2020. The average sea–air flux of CO2 was 10.00 mmol m−2 d−1 during autumn 2020 and was 16.00 mmol m−2 d−1 during spring 2021, which revealed that the EIO served as a CO2 source during the study period. In addition, the separation of different controlling processes of DIC indicated stronger mixing processes, less CaCO3 precipitation, more intensive sea–air exchange, and weaker photosynthesis during spring 2021 than during autumn 2020.

show abstract

Section: Calculations For Separating Dic Controlling Processesmentioning

confidence: 99%

Distributions and controlling processes of the carbonate system in the Eastern Indian Ocean during autumn and spring

Wu,

Yuan,

Liu

et al. 2024

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…DIC and δ 13 C DIC samples were filtered to 20 mL high borosilicate glass bottles with 0.45 µm disposable syringe filters and dissolved organic carbon (DOC) samples were filtered through 0.7 µm GF/F glass fiber membrane (Whatman Corporation, Maidstone, UK) into 100 mL vials, and then these samples were stored at 4 • C until laboratory analysis after addition of saturated mercuric chloride solution (final concentration: ~0.04% by volume). The concentrations of DIC and DOC were measured by using a total organic carbon analyzer (Multi N/C 3100, Analytik Jena Corporation, Jena, Germany) with an uncertainty of ~0.06 mg L −1 [37]. The δ 13 C DIC values were measured using a Gasbench II Extraction Line coupled with a Finnigan MAT 253 Mass Spectrometer (Thermo Electron Corporation, Massachusetts, USA), with a standard deviation of 0.05‰ (n = 4).…”

Section: Station Setting and Sample Processingmentioning

confidence: 99%

“…The above instrument analysis work was completed within three weeks after sampling. Also, in situ pH, partial pressure of CO 2 (pCO 2 ) and [HCO 3 − ] were calculated from DIC, pH @25 • C and Tw based on the CO2SYS program (Version 2.3) [38] which was a calculator for the CO 2 system for Microsoft Excel 2016 and was used in many studies [35][36][37]39]. The dissociation constants (K 1 and K 2 ) of carbonic acid determined by Millero.…”

Section: Station Setting and Sample Processingmentioning

confidence: 99%

The Sustained Response of Dissolved Inorganic Carbon to Urban Constructed Wetland in the Fenhe River, China: A Case Study

Dang,

Zhang,

2024

Sustainability

Self Cite

View full text Add to dashboard Cite

Sustained wetland utilization has been effective in purifying urban riverine pollutants and promoting sustainable development. However, its effect on water CO2 system remains unclear in semi-arid areas. In this study, seasonal monitoring of the carbonate system was performed at two compared stations, i.e., in constructed wetland (Xiangyun station) and its upstream (Lancun station) in a semi-arid river (the Fenhe River) in China. As indicated by the result of the sustained monthly observation from May 2020 to May 2021, riverine dissolved inorganic carbon (DIC) and partial pressure of CO2 (pCO2) reached 30.9–46.7 mg L−1 and 524–1050 μatm in Lancun station, respectively, whereas the above-described values declined significantly in Xiangyun station with the values of 24.1–39.1 mg L−1 for DIC and 188–873 μatm for pCO2. Compared with the Lancun station where the carbonate system was primarily controlled by natural factors (e.g., carbonate weathering and temperature), significant aquatic photosynthesis and calcification precipitation due to constructed wetland triggered the decrease in DIC and pCO2 and dominated their temporal variation in Xiangyun station. Thus, the large CO2 reduction arising from constructed wetlands may create vital paths for CO2 neutralization and sustainable conservation in urban rivers in arid and semi-arid areas in the future.

show abstract

The Response of Carbonate System to Watershed Urbanization Process in a Semi-Arid River

Li,

Dang,

Huang

et al. 2024

J. Ocean Univ. China

View full text Add to dashboard Cite

Seasonal variation of sea surface pH and its controls in the Jiaozhou Bay, China

Cited by 7 publications

References 53 publications

Distributions and controlling processes of the carbonate system in the Eastern Indian Ocean during autumn and spring

Distributions and controlling processes of the carbonate system in the Eastern Indian Ocean during autumn and spring

The Sustained Response of Dissolved Inorganic Carbon to Urban Constructed Wetland in the Fenhe River, China: A Case Study

The Response of Carbonate System to Watershed Urbanization Process in a Semi-Arid River

Contact Info

Product

Resources

About