The Changjiang River plume shifts from carbon source to sink when net community production exceeds a threshold in early autumn

Wu, Di; Chen, Jianfang; Wang, Kui; Ni, Xiaobo; Li, Dewang; Zeng, Dingyong; Fan, Wei; Xu, Duo

doi:10.1016/j.scitotenv.2023.164126

Cited by 4 publications

(2 citation statements)

References 52 publications

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“…The ocean carbon cycle is an essential part of the global carbon cycle and is a critical process in responding to global climate change (Palevsky and Doney, 2021;Friedlingstein et al, 2022;Wu et al, 2023). According to the Intergovernmental Panel on Climate Change Sixth Assessment Report, atmospheric carbon dioxide (CO 2 ) concentrations have reached 410 ppm, which is nearly 50% higher than the preindustrial level of 280 ppm (https:// www.ipcc.ch/ar6-syr/).…”

Section: Introductionmentioning

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.

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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.

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Section: Introductionmentioning

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.

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“…The dominant species, Mytilus coruscus, is cultivated using raft culture techniques that do not require additional feed. The marine areas near Gouqi Island are influenced by tides and diluted water from the Changjiang River, accompanied by relatively high contents of particulate matter and nutrients, as well as high primary productivity [26][27][28]. Furthermore, the interaction between local topography and dynamic hydrology processes generates an upwelling near the estuary of the Changjiang River [29,30].…”

Section: Introductionmentioning

confidence: 99%

Mussel Culture Activities Facilitate the Export and Burial of Particulate Organic Carbon

Han,

Zhang,

Lang

et al. 2024

JMSE

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The recent expansion of shellfish mariculture could significantly impact the ocean carbon cycle and its associated biogeochemical processes. To understand the source and fate of particulate organic carbon (POC), a summer cruise was conducted from September 8 to 10, 2022, at a mussel farm on Gouqi Island and its adjacent areas located in the East China Sea. Parameters included in situ temperature and salinity, contents of dissolved oxygen (DO), suspended particulate matter (SPM), POC, and chlorophyll a (Chl a), as well as the stable carbon isotopic composition (δ13C) of organic matter in particle and sediment samples, which were analyzed to facilitate a comparative assessment of the areas inside and outside the mussel farm. The POM was much fresher (POC/Chl a < 150) inside the farm with little impact from sediment resuspension (lower SPM content, 11.6 ± 6.6 mg/L), while a significant influence of sediment resuspension was found outside the farm (SPM > 20 mg/L, POC/Chl a > 150). A two end-member mixing model showed that 82.0 ± 6.0% of POC originated from marine algae within the farm, much higher than that outside the farming area (66.1 ± 7.8%). Moreover, elevated DO saturation but relatively low Chl a concentration within the farm suggested continuous algae consumption following potential high productivity. The averaged δ13C values were similar among suspended POC, sinking POC, and sedimentary organic carbon within the farm, implying the fast export and burial of POC. This is likely due to the filter-feeding habits of mussels, who ingest fresh POC and then pack it as fecal pellets that rapidly settle into the sediment. This study sheds light on the distribution and sources of POM inside and outside the mussel farm on Gouqi Island, enhancing our understanding of the marine carbon cycle on shellfish farms and providing insights into the underlying biogeochemical processes.

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Spatiotemporal changes and driving mechanism of ecosystem carbon sink in karst peak cluster depression basin in Southwest Guangxi based on the interaction of “water-rock-soil-air-biology”

Huang,

Tian,

Zhang

et al. 2024

Ecological Informatics

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The Changjiang River plume shifts from carbon source to sink when net community production exceeds a threshold in early autumn

Cited by 4 publications

References 52 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

Mussel Culture Activities Facilitate the Export and Burial of Particulate Organic Carbon

Spatiotemporal changes and driving mechanism of ecosystem carbon sink in karst peak cluster depression basin in Southwest Guangxi based on the interaction of “water-rock-soil-air-biology”

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