Behavior of dissolved redox sensitive elements (U, Mo and Re) in the water column of the Bay of Bengal

Singh, Satinder Pal; Singh, Sunil Kumar; Bhushan, Ravi

doi:10.1016/j.marchem.2011.04.001

Cited by 26 publications

(12 citation statements)

References 64 publications

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“…The hydrographic data (temperature, pH, salinity and dissolved oxygen) of the profiles are reported elsewhere (Singh et al, 2011). However, for the sake of completeness the potential temperature and salinity data used for interpretation in this study are given in Table 1.…”

Section: Discussionmentioning

confidence: 99%

Spatial distribution of dissolved neodymium and εNd in the Bay of Bengal: Role of particulate matter and mixing of water masses

Singh

Goswami

et al. 2012

Geochimica et Cosmochimica Acta

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Section: Discussionmentioning

confidence: 99%

Spatial distribution of dissolved neodymium and εNd in the Bay of Bengal: Role of particulate matter and mixing of water masses

Singh

Goswami

et al. 2012

Geochimica et Cosmochimica Acta

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“…First, 234 U is a necessary parameter for estimating Th residence times and fluxes. While 238 U has been shown to be conservative in seawater in several oceanic regions [e.g., Singh et al ., , and references therein], Owens et al . [] reported several samples from the Bermuda Atlantic Time‐series (BATS) site (Figure ) that had considerably depleted U concentrations compared to that expected from salinity.…”

Section: Introductionmentioning

confidence: 99%

Thorium distributions in high‐ and low‐dust regions and the significance for iron supply

Hayes

Rosen

McGee

et al. 2017

Global Biogeochemical Cycles

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Thorium and uranium isotopes (232Th, 230Th, 238U, and 234U) were investigated to refine their use for estimating mineral dust deposition and Fe delivery to the ocean. U concentrations and isotope ratios were consistent with conservative behavior and can safely be described using published U‐salinity relationships and global average seawater isotopic composition. Near Barbados, waters affected by the Amazon outflow contained elevated 232Th. This signals one region where the thorium‐dust method is inaccurate because of a confounding continental input. Dissolved 232Th fluxes in this region suggest that Amazonian Fe supply to the adjacent open ocean is much larger than local atmospheric deposition. The colloidal content of dissolved Th south of Bermuda was found to be quite small (2–6%), similar to that found north of Hawaii, despite the order of magnitude higher dust deposition in the Atlantic. This finding supports the assumption that dissolved 232Th and 230Th are scavenged at the same rate despite their different sources and also sheds light on the increase of dissolved 232Th fluxes with integrated depth. Outside the region influenced by Amazon River waters, dissolved 232Th fluxes are compared with Bermudan aerosol Fe deposition to estimate that fractional Th solubility is around 20% in this region. Finally, new dissolved and soluble Fe, Mn, and Cr data from the subtropical North Pacific support the idea that Fe concentrations in the remote ocean are highly buffered, whereas 232Th has a larger dynamic range between high‐ and low‐dust regions.

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“…Typical vertical profiles of nutrients and dissolved oxygen at 0802, 0806 and 0809 were given in Figure 3. The dissolved oxygen concentrations (Singh et al, 2011) in the surface seawater during this cruise ranges from 201 -254 µmol L -1 (or 4.5 -5.7 ml L -1…”

Section: Resultsmentioning

confidence: 94%

“…The Bay of Bengal does not exhibit large-scale seasonal and spatial variability in phytoplankton standing stock and production (Madhu et al, 2006). Further, a recent study has observed that the redox-sensitive elements in the Arabian Sea and the Bay of Bengal region behave conservatively and the distribution of these elements is governed by physical processes of advection and mixing between water masses and evaporation and not by biogeochemical processes operating in the water column (Singh et al, 2011;Goswami et al, 2012).…”

Section: Introductionmentioning

confidence: 98%

Evidence for enhanced chlorophyll-a levels in the Bay of Bengal during early north-east monsoon

Bhushan¹,

Bikkina²,

Chatterjee³

et al. 2018

J. Oceanogr. Mar. Sci.

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To understand the chlorophyll-a distribution in the neritic waters of the northern Indian Ocean, which comprises the Arabian Sea on the west and the Bay of Bengal on the east, seawater samples were collected during early north-east monsoon season (November, 2008). The column integrated chlorophyll-a over the Arabian Sea and the North Bay of Bengal exhibit high concentrations. However, the southernmost station (0806) shows enhanced chlorophyll-a concentration compared to other stations in the south Bay (0807, 0808 and 0809). This is attributed to eddy pumping of nutrients from subsurface to surface waters of the Bay during the study period due to cyclonic conditions. This observation is further supported by the lack of nutrients in the surface waters at the other stations from the south Bay compared to the station 0806, which has high nutrient concentrations. The observed salinity in the Bay of Bengal shows a strong north-south gradient with higher salinity in the southern part of the Bay. The supply of nutrients through fluvial input (that is, dominantly from the northern region) is insignificant. The enhanced chlorophyll-a concentration over the farthest station (0806) can be either due to Eddy mediated biological production or lateral advective transport of nutrients.

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Behavior of dissolved redox sensitive elements (U, Mo and Re) in the water column of the Bay of Bengal

Cited by 26 publications

References 64 publications

Spatial distribution of dissolved neodymium and εNd in the Bay of Bengal: Role of particulate matter and mixing of water masses

Spatial distribution of dissolved neodymium and εNd in the Bay of Bengal: Role of particulate matter and mixing of water masses

Thorium distributions in high‐ and low‐dust regions and the significance for iron supply

Evidence for enhanced chlorophyll-a levels in the Bay of Bengal during early north-east monsoon

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