Influence of basin-scale and mesoscale physical processes on biological productivity in the Bay of Bengal during the summer monsoon

Muraleedharan, K. R.; Purushothaman, Jasmine; Achuthankutty, C.T.; Revichandran, C.; Kumar, Pankaj; Anand, Pallavi; Rejomon, G.

doi:10.1016/j.pocean.2006.09.012

Cited by 74 publications

(56 citation statements)

References 25 publications

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“…Ample evidence is available from the Gulf Stream (Beckmann et al 1987) and Gulf of Mexico (Ressler and Jochens 2003), where higher zooplankton biomass associated with enhanced nutrient and Chl a concentration in cold-core eddies was reported. Only a couple of such observations are available from the Bay of Bengal (Muraleedharan et al 2007;Fernandes 2008). Sharp declines in zooplankton biomass and density at subsurface depths are a typical feature of tropical oceans (Vinogradov 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Studies on mesozooplankton biomass, abundance, taxonomic groups, and ecology from the Bay of Bengal are few (Panikkar and Rao 1973;Nair et al 1981;Rakhesh et al 2006;Muraleedharan et al 2007;Fernandes 2008;Fernandes and Ramaiah 2009), and the information available is mostly for the upper 200 m. This investigation was carried out to provide a detailed account of spatial and vertical variations in the mesozooplankton biomass, density, and copepod assemblages in the upper 1,000 m in the western Bay of Bengal in an area that included two cold-core eddies along the sampling transect.…”

Section: Introductionmentioning

confidence: 99%

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Mesozooplankton community structure in the upper 1,000 m along the western Bay of Bengal during the 2002 fall intermonsoon

Fernandes

Ramaiah

2013

Zool. Stud.

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Background: Stratification, no upwelling, sediment load, and heavy cloud cover are known to limit primary production in the western Bay of Bengal. Studies on primary consumers in this area are few. Recent studies in the Bay have shown the role of cold-core eddies in enhancing the biological production. This study was carried out to provide a detailed account of variation in mesozooplankton biomass, abundance, and copepod assemblages between cold-core eddy and non-eddy regions in the western Bay. Results: In this study carried out in the western Bay during fall 2002 intermonsoon, we observed a very high zooplankton biovolume of 2.2 ml/m 3 in the mixed layer at station WB3 located within a shallow cold-core eddy. Zooplankton from 29 groups were observed during this study. Calanoid and poecilostomatoid copepods substantially contributed to the total zooplankton abundance and carbon biomass. Below the 200 m depth, there were fewer groups but higher proportion of copepods. Copepodites of calanoids were more abundant between 500 and 1,000 m at the WB3 eddy station. Invertebrate eggs made up a staggering 65% of the total collection in the 200-to 300-m stratum at WB1, a location in the other cold-core eddy. Copepod species diversity (3.39 to 4.77) and richness (2.32 to 4.84) were lower at WB3. Among 147 copepod species in 69 genera found, Oncaea venusta (17% of the total copepod abundance), Paracalanus indicus (5.4%), Lucicutia flavicornis (5.1%), and Pleuromamma indica (4.5%) were the four most dominant ones.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mesozooplankton community structure in the upper 1,000 m along the western Bay of Bengal during the 2002 fall intermonsoon

Fernandes

Ramaiah

2013

Zool. Stud.

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“…trap mooring. Though the role of mesoscale cyclonic eddies in the BoB are known in bringing high nutrients in to the euphotic zone leading to increase the rate of biological productivity [Nuncio and Prasanna Kumar, 2012;Prasanna Kumar et al, 2004, 2007, Nuncio, 2007Muraleedharan et al, 2007], their role in phytoplankton community structure and associated carbon export to deep ocean is not yet known. The analysis of the time series of biogenic flux data at NBBT (1994NBBT ( -1998 and CBBT (1993CBBT ( -1996 though did not show any distinct seasonality, a common feature among them were the presence of four peaks representing elevated fluxes at both locations.…”

Section: Discussionmentioning

confidence: 99%

“…Though the enhancement of chlorophyll biomass in response to the passage of cyclones [Nayak et al, 2001;Rao et al, 2006;Patra et al, 2007;Vinayachandran and Mathew, 2003] and mesoscale eddies Muraleedharan et al, 2007;Nuncio, 2007;Nuncio and Prasanna Kumar, 2012] are relatively well studied in the BoB, the mechanistic connection between the production of organic carbon in the upper ocean and its export to deeper waters in the BoB is still largely unknown. Since cyclones occur only during spring (April to May) and fall (October to November) and lasts for a very short period (<1 week), sediment trap data with a typical sampling frequency of 26-42 days cannot resolve the organic carbon export related to cyclones.…”

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confidence: 99%

Role of meso-scale eddies on the variability of biogenic flux in the northern and central Bay of Bengal

Vidya

Kumar

2013

J. Geophys. Res. Oceans

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“…During the summer monsoon, the biological productivity is influenced by mesoscale and basin scale physical processes [7][8]. Phytoplankton becomes intensified by cyclones in the BOB during the northeast monsoon [9].…”

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confidence: 99%

Numerical Analysis of the Biogeochemical Parameters in the Bay of Bengal

Deb¹,

Chakraborty²

2016

JSOE

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Oceanic nutrient cycling plays a key role in understanding how oceanic biogeochemical parameters respond in varying physical and anthropogenically controlled processes. OA (Objective Analysis) of monthly climatology of WOA13 (World Ocean Atlas 13) nutrient data of 5 km resolution called Nutrient-Climo has been done in this paper for analyzing the nutrient-rich region in the BOB (Bay of Bengal) and the mechanisms of physical forces were examined using six years (2002)(2003)(2004)(2005)(2006)(2007) global ocean monthly analysis datasets based on the SODA v2.0.4 (Simple Ocean Data Assimilation package). The upwelled zones established from the circulation pattern were well synchronized with the nitrate rich zones. The POC (particulate organic carbon) of 5 km resolution has been analyzed from MODIS (Moderate-resolution Imaging Spectroradiometer) data and Chl a (Chlorophyll a) concentration SeaWiFS (Sea-viewing Wide Field-of-view Sensor) data of 9 km resolution are used to predict the productive zones in the BOB. In this paper, we examined that Chl a concentration (above 0.5 mg/m 3 ) is found during the post-monsoon followed by winter in the north-western, north-eastern coast and head BOB as the source of nutrients is also supplementary due to high input of litter and sediment associated nutrients that are released during estuarine transport.

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Influence of basin-scale and mesoscale physical processes on biological productivity in the Bay of Bengal during the summer monsoon

Cited by 74 publications

References 25 publications

Mesozooplankton community structure in the upper 1,000 m along the western Bay of Bengal during the 2002 fall intermonsoon

Mesozooplankton community structure in the upper 1,000 m along the western Bay of Bengal during the 2002 fall intermonsoon

Role of meso-scale eddies on the variability of biogenic flux in the northern and central Bay of Bengal

Numerical Analysis of the Biogeochemical Parameters in the Bay of Bengal

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