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dc.contributor.authorShenoy, D.M.
dc.contributor.authorKurian, S.
dc.contributor.authorShirodkar, G.
dc.contributor.authorNaik, H.
dc.contributor.authorGauns, M.
dc.contributor.authorNaqvi, S.W.A.
dc.date.accessioned2021-09-30
dc.date.accessioned2021-10-01T07:25:46Z
dc.date.available2021-07-01
dc.date.available2021-10-01T07:25:46Z
dc.date.issued2021
dc.identifier.citationEnvironmental Science and Pollution Research, vol.28(29); 2021; 39655-39667
dc.identifier.issn1614-7499
dc.identifier.otherhttps://link.springer.com/article/10.1007/s11356-021-13472-x
dc.identifier.urihttps://doi.org/10.1007/S11356-021-13472-X
dc.identifier.urihttps://drs.nio.org/drs/handle/2264/8701
dc.descriptionIF2020 - 4.223
dc.description.abstractCarbon neutrality of tropical reservoirs is a big concern in recent years as some estimates project high methane emission from these reservoirs. While there are studies available on the impact of physical processes (stratification and mixing) on the biogeochemistry of tropical reservoirs, not much information is available on the inter-annual variability in the low-oxygen conditions and production/accumulation of hydrogen sulphide (H2S) and methane (CH4) during summer. This paper presents time series data based on monthly in situ observations from a tropical reservoir (Tillari, Maharashtra) situated in the Western Ghats in India. Sampling was carried out for temperature, dissolved oxygen (DO), H2S, and CH4 at a fixed location from March 2010 until June 2014. The reservoir experiences stable stratification during summer (March to June) with complete loss of oxygen and production of H2S (max. ~ 9 mu M) and CH4 (max. ~ 185 mu M) in the profundal zone. During the summer stratification, the hypolimnion acted as a pool of CH4 with integrated values ranging between 3502 and 41,632 mg m-2. However, the intensity and duration of anoxia varied during different years, influencing H2S and CH4 production. Mixing in the reservoir was observed between July and September in association with the monsoonal runoff, which increased the DO concentrations in the sub-surface layers. Besides, complete mixing was observed between December and February due to winter convection. This, however, was found to play an important role, as weaker mixing in the preceding year was associated with severe oxygen loss in the profundal zone during the following summer with a production of H2S and CH4. In contrast, more robust mixing during winter led to moderate low-oxygen conditions with less production of these gases in the subsequent summer. Based on our observations and considering a large number of reservoirs in the tropics, we hypothesise that with the present trends of global warming and less cold winters, low-oxygen conditions in the profundal zone may become more severe in the future with positive feedback on H2S and CH4 production during summer.
dc.languageen
dc.publisherSpringer
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleImpact of physical processes on oxygen loss and production of hydrogen sulphide and methane in a tropical freshwater reservoir
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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