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V Venkataramana - One of the best experts on this subject based on the ideXlab platform.
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influence of river Discharge on abundance and composition of phytoplankton in the western coastal bay of bengal during peak Discharge Period
Marine Pollution Bulletin, 2018Co-Authors: M D Bharathi, V V S S Sarma, K Ramaneswari, V VenkataramanaAbstract:Abstract To understand the influence of river Discharge on phytoplankton composition along western coastal Bay of Bengal (BoB), surface water samples were collected during peak Discharge Period. River Discharge from the Ganges influences northwest (NW) coastal BoB whereas peninsular rivers (Godavari and Krishna) Discharge to the southwest (SW) coastal Bay. River Discharge from the Ganges is an order of magnitude higher than peninsular river resulting in low saline, less suspended matter and lower nutrients concentrations in the NW and contrasting to that was observed in the SW. ~50%of the phytoplankton were composed of Thalassiosira spp., Nitzschia spp., Microcystis spp., Amphiprora spp. and Thalassionema spp. in the SW whereas Thalassiosira spp., Nitzschia spp., Chaetoceros spp., Merismopedia spp. and Peridinium spp. in the NW. Significant variability in phytoplankton composition was observed from coast to offshore. Our study revealed that river Discharge and associated physico-chemical characteristics governed the phytoplankton community along western coastal BoB.
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Reduced river Discharge intensifies phytoplankton bloom in Godavari estuary, India
Marine Chemistry, 2012Co-Authors: T. Acharyya, M D Bharathi, V V S S Sarma, V Venkataramana, B. Sridevi, B. S. K. Kumar, V. R. Prasad, S. A. Naidu, Debasmita Bandyopadhyay, N P C ReddyAbstract:Changes in river Discharge alter material load and the consequent estuarine and coastal biogeochemical process. Evidence for biogeochemical response to variable rainfall over catchment area or changes in river Discharges due to dam regulations is sparse. Inter-annual variability in monsoon rainfall and the consequent river Discharges, either dam regulated or otherwise, in India are the best suited to test the influence of altered Discharges on estuarine biogeochemistry. Our experiments in Godavari river estuary over three years revealed that a decrease in precipitation over the Indian subcontinent from 2007 to 2009 resulted in the lowering of mean annual Discharge from 748.63 m 3 s -1 in 2007 to 218.40 m 3 s -1 in 2009. The reduced water Discharge, during the peak Discharge Period, slowed the flushing of the estuary from 1.2 days to 6.3 days, respectively. The consequent increase in stability of water column and reduced suspended material load gave rise to intense phytoplankton blooms (Chl a 18 μg l -1 in 2007 to 28 μg l -1 in 2009). Resilience towards the unwanted phytoplankton bloom and overall health of the Indian estuaries is thus tuned by the variability in monsoon rainfall and dam regulated Discharge.
M A Rosen - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the optimum Discharge Period for closed thermal energy storages using energy and exergy analyses
Solar Energy, 1993Co-Authors: L H Gunnewiek, S Nguyen, M A RosenAbstract:Abstract Analytical expressions are developed for the Discharge efficiencies for closed, fully mixed, sensible thermal energy storage systems. Using Discharge efficiencies, the optimum Discharge Period based on thermodynamic criteria can be determined. The authors conclude that, since exergy is a measure of the quality or usefulness of energy, exergy performance measures are more significant than energy performance measures, and that exergy analysis should be considered in the evaluation of the optimum Discharge Period for thermal energy storage systems. The application of the results to a particular example illustrates the usefulness of using exergy-based performance measures.
V V S S Sarma - One of the best experts on this subject based on the ideXlab platform.
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influence of river Discharge on abundance and composition of phytoplankton in the western coastal bay of bengal during peak Discharge Period
Marine Pollution Bulletin, 2018Co-Authors: M D Bharathi, V V S S Sarma, K Ramaneswari, V VenkataramanaAbstract:Abstract To understand the influence of river Discharge on phytoplankton composition along western coastal Bay of Bengal (BoB), surface water samples were collected during peak Discharge Period. River Discharge from the Ganges influences northwest (NW) coastal BoB whereas peninsular rivers (Godavari and Krishna) Discharge to the southwest (SW) coastal Bay. River Discharge from the Ganges is an order of magnitude higher than peninsular river resulting in low saline, less suspended matter and lower nutrients concentrations in the NW and contrasting to that was observed in the SW. ~50%of the phytoplankton were composed of Thalassiosira spp., Nitzschia spp., Microcystis spp., Amphiprora spp. and Thalassionema spp. in the SW whereas Thalassiosira spp., Nitzschia spp., Chaetoceros spp., Merismopedia spp. and Peridinium spp. in the NW. Significant variability in phytoplankton composition was observed from coast to offshore. Our study revealed that river Discharge and associated physico-chemical characteristics governed the phytoplankton community along western coastal BoB.
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export of dissolved inorganic nutrients to the northern indian ocean from the indian monsoonal rivers during Discharge Period
Geochimica et Cosmochimica Acta, 2016Co-Authors: M S Krishna, V V S S Sarma, M H K Prasad, D B Rao, R Viswanadham, N P C ReddyAbstract:Abstract Coastal regions are highly productive due to the nutrients largely supplied by rivers. To examine the contribution of dissolved inorganic nutrients (DIN) by Indian rivers to coastal waters, data were collected near the freshwater heads of 27 monsoonal rivers of peninsular India during three weeks in late July to mid-August, the middle of the principal runoff Period of the southwest monsoon of 2011. Twelve researchers in four groups, equipped with car and portable laboratory equipment, sampled mid-stream of each estuary using mechanized boat, and filtered and partly analyzed the water in the evening. The estimated exports were 0.22 ± 0.05, 0.11 ± 0.03, and 1.03 ± 0.26 Tg yr−1 for dissolved inorganic nitrogen, phosphorus and silicate, respectively. Higher amounts of DIN reach the Bay of Bengal than the Arabian Sea due to the higher volume (∼76%) of Discharge to the former. In contrast, the export of dissolved inorganic nitrogen is almost same to the Bay of Bengal (0.12 ± 0.03 Tg yr−1) and Arabian Sea (0.10 ± 0.02 Tg yr−1) principally due to the polluted Narmada and Tapti rivers in the northwest. Including input from the glacial rivers, Ganges, Brahmaputra and Indus, it is estimated that the northern Indian Ocean receives ∼1.84 ± 0.46, 0.28 ± 0.07 and 3.58 ± 0.89 Tg yr−1 of nitrate, phosphate and silicate, respectively, which are significantly lower than the earlier estimates of DIN export from the Indian rivers based on DIN measured in the mid or upstream rivers. Such low fluxes in this study were attributed to efficient retention/elimination of DIN (∼91%) before reaching the coastal ocean. Hence, this study suggests that the importance of sampling locations for estimating nutrient fluxes to the coastal ocean. Riverine DIN export of 1.84 ± 0.46 Tg yr−1 would support 12.2 ± 3.1 Tg C yr−1 of new production in coastal waters of the northern Indian Ocean that results in a removal of 12.2 ± 3.1 Tg atmospheric CO2 yr−1.
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Intensified oxygen minimum zone on the western shelf of Bay of Bengal during summer monsoon: influence of river Discharge
Journal of Oceanography, 2013Co-Authors: V V S S Sarma, M S Krishna, R Viswanadham, B. Sridevi, B. S. K. Kumar, V. R. Prasad, Ch. V. Subbaiah, T. Acharyya, D. BandopadhyayAbstract:A study on biogeochemical cycling in the west coastal Bay of Bengal was undertaken during the peak Discharge Period to understand the influence of enhanced stratification and primary production on the possible intensification of the oxygen minimum zone (OMZ). Our study reveals that oxygen concentrations were below the detection limits in the northwestern (NW) coastal Bay of Bengal between 100 and 500 m associated with strong stratification and high phytoplankton biomass. Such low oxygen concentrations have never been reported so far from the coastal Bay of Bengal. Despite the existence of an environment conducive to denitrification in the coastal Bay of Bengal, accumulation of neither secondary nitrite nor nitrous oxide (N_2O) was observed. The absence of denitrification was reported to be caused by faster scavenging of organic matter and low bacterial respiration rates; in contrast, our results suggest that neither of these factors are potential reasons for the absence of denitrification in the coastal Bay of Bengal.
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Reduced river Discharge intensifies phytoplankton bloom in Godavari estuary, India
Marine Chemistry, 2012Co-Authors: T. Acharyya, M D Bharathi, V V S S Sarma, V Venkataramana, B. Sridevi, B. S. K. Kumar, V. R. Prasad, S. A. Naidu, Debasmita Bandyopadhyay, N P C ReddyAbstract:Changes in river Discharge alter material load and the consequent estuarine and coastal biogeochemical process. Evidence for biogeochemical response to variable rainfall over catchment area or changes in river Discharges due to dam regulations is sparse. Inter-annual variability in monsoon rainfall and the consequent river Discharges, either dam regulated or otherwise, in India are the best suited to test the influence of altered Discharges on estuarine biogeochemistry. Our experiments in Godavari river estuary over three years revealed that a decrease in precipitation over the Indian subcontinent from 2007 to 2009 resulted in the lowering of mean annual Discharge from 748.63 m 3 s -1 in 2007 to 218.40 m 3 s -1 in 2009. The reduced water Discharge, during the peak Discharge Period, slowed the flushing of the estuary from 1.2 days to 6.3 days, respectively. The consequent increase in stability of water column and reduced suspended material load gave rise to intense phytoplankton blooms (Chl a 18 μg l -1 in 2007 to 28 μg l -1 in 2009). Resilience towards the unwanted phytoplankton bloom and overall health of the Indian estuaries is thus tuned by the variability in monsoon rainfall and dam regulated Discharge.
Eva Laiwah Dunn - One of the best experts on this subject based on the ideXlab platform.
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risk factors for suicide in the immediate post Discharge Period
Social Psychiatry and Psychiatric Epidemiology, 2007Co-Authors: Chuikwan Kan, Jimmy Y S Dong, Eva Laiwah DunnAbstract:Background Suicide risk is highest in the first few months following psychiatric in-patient care. Most data on post-Discharge suicides have come from Western countries. Many studies collected cases of suicide over a long post-Discharge Period and did not focus on this high-risk Period. This study aims to describe the characteristics and examine the risk factors of suicides occurring in the immediate post-Discharge Period in Hong Kong.
Lars Vedel Kessing - One of the best experts on this subject based on the ideXlab platform.
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Circadian reinforcement therapy in combination with electronic self-monitoring to facilitate a safe post-Discharge Period of patients with depression by stabilizing sleep: protocol of a randomized controlled trial
BMC Psychiatry, 2019Co-Authors: Signe Dunker Svendsen, Anne Sofie Aggestrup, Lasse Benn Nørregaard, Philip Løventoft, Anne Præstegaard, Konstantin V. Danilenko, Mads Frost, Ulla Knorr, Ida Hageman, Lars Vedel KessingAbstract:BackgroundThe transition phase from inpatient to outpatient care for patients suffering from Major Depressive Disorder represents a vulnerable Period associated with a risk of depression worsening and suicide. Our group has recently found that the sleep-wake cycle in Discharged depressive patients became irregular and exhibited a drift towards later hours, associated with worsening of depression. In contrast, an advancement of sleep phase has earlier been shown to have an antidepressant effect. Thus, methods to prevent drift of the sleep-wake cycle may be promising interventions to prevent or reduce worsening of depression after Discharge.MethodsIn this trial, we apply a new treatment intervention, named Circadian Reinforcement Therapy (CRT), to patients Discharged from inpatient psychiatric wards. CRT consists of a specialized psychoeducation on the use of regular time signals (zeitgebers): daylight exposure, exercise, meals, and social contact. The aim is to supply stronger and correctly timed zeitgebers to the circadian system to prevent sleep drift and worsening of depression. The CRT is used in combination with an electronic self-monitoring system, the Monsenso Daybuilder System (MDB). By use of the MDB system, all patients self-monitor their sleep, depression level, and activity (from a Fitbit bracelet) daily. Participants can inspect all their data graphically on the MDB interface and will have clinician contact. The aim is to motivate patients to keep a stable sleep-wake cycle. In all, 130 patients referred to an outpatient service will be included. Depression rating is blinded. Patients will be randomized 1:1 to a Standard group or a CRT group . The intervention Period is 4 weeks covering the transition phase from inpatient to outpatient care. The primary outcome is score change in interviewer rated levels of depression on the Hamilton Depression Rating Scale. A subset of patients will be assessed with salivary Dim Light Melatonin Onset (DLMO) as a validator of circadian timing. The trial was initiated in 2016 and will end in 2020.DiscussionIf the described intervention is beneficial it could be incorporated into usual care algorithms for depressed patients to facilitate a better and safer transition to outpatient treatment.Trial registrationPosted prospectively at ClinicalTrials.gov at February 10, 2016 with identifier NCT02679768 .