Diurnal carbon dynamics in a mangrove-dominated tropical estuary (Sundarbans, India)

Dutta, Manab Kumar; Kumar, Sanjeev; Mukherjee, Rupa; Sharma, Niharika; Acharya, Avanti; Sanyal, Prasun; Bhusan, Ravi; Mukhopadhyay, Sandip

doi:10.1016/j.ecss.2019.106426

Cited by 27 publications

(25 citation statements)

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“…In contrast, there is little change of δ 13 C during decomposition (Fry, 2006). We used only δ 13 C and N/C in the mixing model because we assumed δ 15 N signatures might be affected by denitrification and ammonification, as these diagenetic pathways were found to be dominant in these estuaries (Dutta, Kumar, Mukherjee, Sharma, et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO₂ Fluxes in a Tropical Mangrove Dominated Estuary

et al. 2021

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Estuaries are biogeochemically active zones where both particulate and dissolved matter undergoes vigorous transformations (Bianchi, 2007), mostly in ways that make these waters net heterotrophic (Gattuso et al., 1998;Testa et al., 2012), eventually leading to emission of substantial amounts of CO 2 to the atmosphere (Laruelle et al., 2010(Laruelle et al., , 2013. However, net autotrophy with the accompanying CO 2 sink is sometimes observed in some estuaries (Crosswell et al., 2017;Maher & Eyre, 2012). Besides the trophic state,

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Section: Methodsmentioning

confidence: 99%

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO₂ Fluxes in a Tropical Mangrove Dominated Estuary

et al. 2021

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“…The calculated k values were then used to obtain the gas flux density using Eq. 1 and extrapolated to the total estuarine area of 1,800 km 2 (Dutta et al, 2019) by multiplying the total estuary area to the mean flux density (n = 244) and expressed as yearly emission. The fluxes were also expressed as CO 2 equivalents by multiplying emissions by their global warming potentials (GWPs); 1 for CO 2 , 28 for CH 4 , and 265 for N 2 O.…”

Section: Water Sampling and Analysismentioning

confidence: 99%

“…Only one site in the Saptamukhi, the Lothian Island, was chosen to carry out three tidal observations to assess the tidal pattern of the gases. Several studies have been conducted on this site (Dutta et al, 2019;Ray et al, 2013), considering its position at the confluence of the estuary and the Bay of Bengal and its stable condition that provides a better tidal observation. Comparing the three tidal cycles (Figure 3), it was observed that the approximate tide heights were similar, thus confirming stable tidal variation at the site.…”

Section: Tidal Patternmentioning

confidence: 99%

“…on the northeast coast of India and drain into the Bay of Bengal. The estuary has an area of 1,800 km 2 (Dutta et al, 2019) with a tidal range of 4.32 and 5.58 m (Chatterjee et al, 2013). The intertidal area is 45% of 4,260 km 2 (Dutta et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The intertidal area is 45% of 4,260 km 2 (Dutta et al, 2017). Overall, the estuaries have a mean depth of ~6 m (Dutta et al, 2019) with a semidiurnal tide pattern and limited freshwater supply, making the estuaries marine dominated (Dutta et al, 2015). The estuaries receive partial anthropogenic inputs in the monsoon.…”

Section: Introductionmentioning

confidence: 99%

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Distribution and Dynamics of Radiatively Active Gas (RAG) Emissions From Major Estuaries of the Sundarbans Mangrove, India

et al. 2022

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The world’s largest mangroves ecosystem, the Sundarbans, being highly productive and a place for extensive organic matter cycling, is considered to be the hotspot for biogeochemical studies in the tropical estuarine environment. Hence, the spatial and temporal dynamics of the biogenic gases (CO2, CH4, and N2O), also known as radiatively active gases, were measured in mangrove-dominated estuaries of the system. In addition to spatial and seasonal observation, three full tidal cycles were observed at one site. Results showed that the air/water gas saturations were widely distributed and highly variable along the stretch. The gas saturations showed varying responses to salinity and tidal fluctuations. This indicated that localized biogeochemical processes may be more influential than simple mixing and dilution processes in controlling the variability of these gases. The surface waters were always supersaturated with CH4 (Up to 13,133%) relative to the atmosphere. However, N2O ranged from 8 to 1,286% and CO2 from 30 to 2075%. N2O fluxes were ∼4.8 times higher in the pre-monsoon than the post-monsoon. CH4 fluxes were ∼3.6 times higher in the pre-monsoon than both the monsoon and the post-monsoon. CO2 fluxes were ∼10 times higher in the monsoon than both the pre-monsoon and the post-monsoon. The seasonality in the gas saturation could be linked more to the availability of substrates than physicochemical parameters. Overall, air/water CH4 fluxes varied maximally (0.4–18.4 μmol m−2 d−1), followed by CO2 fluxes (−0.6–10.9 mmol m−2 d−1), and N2O fluxes varied the least of all (−0.6–5.4 μmol m−2 d−1). Interestingly, CH4 and N2O fluxes were positively correlated to each other (p < 0.05), suggesting organic matter decomposition as the key factor in the production of these two gases. Finally, these water–air CO2, CH4, and N2O flux estimates show that the estuaries are a modest source of CH4 but fluctuate between sources and sinks for CO2 and N2O gases.

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Food Webs and Carbon Fluxes

2021

Tropical Marine Ecology

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Diurnal carbon dynamics in a mangrove-dominated tropical estuary (Sundarbans, India)

Cited by 27 publications

References 70 publications

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO₂ Fluxes in a Tropical Mangrove Dominated Estuary

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO₂ Fluxes in a Tropical Mangrove Dominated Estuary

Distribution and Dynamics of Radiatively Active Gas (RAG) Emissions From Major Estuaries of the Sundarbans Mangrove, India

Food Webs and Carbon Fluxes

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Diurnal carbon dynamics in a mangrove-dominated tropical estuary (Sundarbans, India)

Cited by 27 publications

References 70 publications

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO2 Fluxes in a Tropical Mangrove Dominated Estuary

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO2 Fluxes in a Tropical Mangrove Dominated Estuary

Distribution and Dynamics of Radiatively Active Gas (RAG) Emissions From Major Estuaries of the Sundarbans Mangrove, India

Food Webs and Carbon Fluxes

Contact Info

Product

Resources

About

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO₂ Fluxes in a Tropical Mangrove Dominated Estuary

Reduction in Riverine Freshwater Supply Changes Inorganic and Organic Carbon Dynamics and Air‐Water CO₂ Fluxes in a Tropical Mangrove Dominated Estuary