Carbon Dioxide Emissions from the Tropical Dowleiswaram Reservoir on the Godavari River, Southeast of India

Prasad, M.H.K.; Sarma, V. V. S. S.; Krishna, M. S.; Reddy, N. P. C.

doi:10.4236/jwarp.2013.55054

Cited by 13 publications

(4 citation statements)

References 44 publications

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“…In the reservoir, the effects of rainfall are emphasised by the decoupling of p CO 2 and 222 Rn which was elevated near a stream in the northern area ( Fig 5 ). Tropical reservoir studies have reported rainfall events which load high amounts of terrestrial CO 2 into receiving waters [ 27 , 29 , 49 ] by increased river discharge [ 53 ] and carbon rich terrestrial inputs as a result of soil erosion [ 51 ]. Tropical regions in particular are prone to high CO 2 terrestrial loading as a result of episodic heavy rainfall events, pronounced wet seasons and high surface water temperatures.…”

Section: Discussionmentioning

confidence: 99%

Carbon dioxide dynamics in a lake and a reservoir on a tropical island (Bali, Indonesia)

et al. 2018

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Water-to-air carbon dioxide fluxes from tropical lakes and reservoirs (artificial lakes) may be an important but understudied component of global carbon fluxes. Here, we investigate the seasonal dissolved carbon dioxide (CO2) dynamics in a lake and a reservoir on a tropical volcanic island (Bali, Indonesia). Observations were performed over four seasonal surveys in Bali’s largest natural lake (Lake Batur) and largest reservoir (Palasari Reservoir). Average CO2 partial pressures in the natural lake and reservoir were 263.7±12.2 μatm and 785.0±283.6 μatm respectively, with the highest area-weighted partial pressures in the wet season for both systems. The strong correlations between seasonal mean values of dissolved oxygen (DO) and pCO2 in the natural lake (r2 = 0.92) suggest that surface water metabolism was an important driver of CO2 dynamics in this deep system. Radon (222Rn, a natural groundwater discharge tracer) explained up to 77% of the variability in pCO2 in the shallow reservoir, suggesting that groundwater seepage was the major CO2 driver in the reservoir. Overall, the natural lake was a sink of atmospheric CO2 (average fluxes of -2.8 mmol m-2 d-1) while the reservoir was a source of CO2 to the atmosphere (average fluxes of 7.3 mmol m-2 d-1). Reservoirs are replacing river valleys and terrestrial ecosystems, particularly throughout developing tropical regions. While the net effect of this conversion on atmospheric CO2 fluxes remains to be resolved, we speculate that reservoir construction will partially offset the CO2 sink provided by deep, volcanic, natural lakes and terrestrial environments.

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Section: Discussionmentioning

confidence: 99%

Carbon dioxide dynamics in a lake and a reservoir on a tropical island (Bali, Indonesia)

et al. 2018

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“…Higher nutrient concentrations were reported during the wet period associated with discharge compared to the dry period. The concentrations of NO 3 – in the dam reservoir ranges between 562 and 700 mg/L during the discharge period …”

Section: Methodsmentioning

confidence: 99%

“…The concentrations of NO 3 − in the dam reservoir ranges between 562 and 700 mg/L during the discharge period. 49 2.1.2. Soil Type and Agricultural Practices along the Godavari River Bank.…”

Section: Study Region 211 Godavari River Estuarymentioning

confidence: 99%

Isotopic Evidence of Denitrified Nitrate in Groundwater beneath Intensive Agriculture and Exchange with Estuary (Godavari, India)

Kumar,

Sridevi,

Sarma

et al. 2024

ACS EST Water

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Nitrate is accumulated in the groundwater, modified through nitrification/denitrification, and exchanged with coastal/estuarine water bodies. To examine the sources and modifications of nitrate, the concentrations and isotopic composition of nitrate (δ 15 N and δ 18 O NOd 3 ) in the groundwater was monitored at 5 locations along the bank of Godavari estuary and in the estuarine waters for 7 months during wet (August−November) and dry (March−May) periods. Though the concentration of nitrate (NO 3 − ) was higher during the wet than dry periods in both the groundwater and estuary, insignificant seasonal variability was observed in δ 15 N and δ 18 O NOd 3 indicating homogenization through mineralization−immobilization turnover of NO 3 − . The range of δ 15 N to δ 18 O of NO 3 − indicates soil, manure, and septic waste may be the major source of NO 3 − . The mean ratio of δ 15 N/δ 18 O of 1.1 ± 0.3 indicates the occurrence of denitrification in the groundwater. Concentrations δ 15 N NOd 3 and δ 18 O NOd 3 of NO 3 − displayed a significant relation between groundwater and estuarine water suggesting that NO 3 − is possibly denitrified. This study suggests that denitrified NO 3 − (enriched δ 15 N and δ 18 O) reported in the Godavari estuary may be contributed through submarine groundwater discharge than it is hypothesized to flux from the watershed.

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“…However, also when a moderate discharge occurs (November, wet period) the residence time of estuarine water is >20 d (Sridevi et al, 2015). Moreover, during November, freshwater phytoplankton blooms have been also reported in the Dowleiswaram dam reservoir waters (Prasad et al, 2013), which could have been injected into the estuary along with freshwater discharge during the wet period. The combination of varying residence times and the potential input of waters from the dam can be reasonably invoked to explain the relative importance of dead freshwater contribution to the detritus pool during the wet period.…”

Section: Variable Sources Of Pom During the Wet And Dry Periodsmentioning

confidence: 99%

Influence of river discharge on zooplankton diet in the Godavari estuary (Bay of Bengal, Indian Ocean)

et al. 2018

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In estuaries, detrital (i.e., non-living) organic matter (OM) contributes significantly to the particulate organic matter (POM) pool and we hypothesize that it may be a major source of estuarine zooplankton diet. To test this hypothesis, the isotopic composition of carbon (d13C) and nitrogen (d15N) of phytoplankton, zooplankton, and POM was assessed in the Godavari estuary (Bay of Bengal, Indian Ocean) during wet (November) and dry periods (January). As a result of higher riverine discharge, POM concentrations and values of the C/Chl-a ratio during the wet period were higher than those measured during the dry one. Relatively lower δ13CPOM values were observed during wet than dry period and contrasting to that was found for δ15NPOM. Detritus from fresh water algae and C3 plants contributed significantly to the POM pool during the wet and dry period, respectively. Based on isotopic mixing model, detrital OM and phytoplankton mostly characterized the POM pools during the wet and dry periods, respectively. Accordingly, our results suggest also that the zooplankton diet was mostly supported by detrital OM during the wet period and by both phytoplankton and detrital OM during the dry one. The zooplankton trophic level (TL, 2.7) during the wet period was relatively higher than that (1.9) during the dry one, suggesting a relative higher preference for detritus than phytoplankton during the wet period. The results of this study allowed us confirming that detrital OM can significantly support zooplankton production in the Godavari estuary.

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Carbon Dioxide Emissions from the Tropical Dowleiswaram Reservoir on the Godavari River, Southeast of India

Cited by 13 publications

References 44 publications

Carbon dioxide dynamics in a lake and a reservoir on a tropical island (Bali, Indonesia)

Carbon dioxide dynamics in a lake and a reservoir on a tropical island (Bali, Indonesia)

Isotopic Evidence of Denitrified Nitrate in Groundwater beneath Intensive Agriculture and Exchange with Estuary (Godavari, India)

Influence of river discharge on zooplankton diet in the Godavari estuary (Bay of Bengal, Indian Ocean)

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