Browsing by Author "Rengarajan, R."
Now showing items 1-11 of 11
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234-Th-Based Carbon Export Flux Along the Indian GEOTRACES GI02 Section in the Arabian Sea and the Indian Ocean
Anand, S.S.; Rengarajan, R.; Sarma, V.V.S.S. (John Wiley & Sons, 2018)234-Th (t1/2 = 24.1 d), present in seawater, is a naturally occurring particle-reactive radionuclide formed through the radioactive decay of its parent, 238U (t1/2 = 4.47 x 109 years). The 234Th:238U disequilibrium is ... -
234Th scavenging and particle export fluxes from the upper 100 m of the Arabian Sea
Sarin, M.M.; Rengarajan, R.; Ramaswamy, V. (Current Science Association, 1996)We have determined the particle scavenging rates, export fluxes of @u234@@Th and settling particles from the upper 100 m of the Arabian Sea as a part of the JGOFS (India) Programme. The spatial and temporal measurements ... -
Can hydrocarbons in coastal sediments be related to terrestrial flux? A case study of Godavari river discharge (Bay of Bengal)
Rayaprolu, K.; GopalaKrishna, V.V.J.; Naik, B.G.; Mahalakshmi, G.; Rengarajan, R.; Mazumdar, A.; Sarma, N.S. (Current Science Association, 2015)A sediment core aged ~250 years and deposition rate of ~2.4 mm yr<sup>-1</sup> raised from the coastal region receiving inputs from the Godavari river was examined for n-alkanes The carbon preference index (CPI) of shortchain ... -
Enhanced export of carbon by salps during the northeast monsoon period in the northern Arabian Sea
Ramaswamy, V.; Sarin, M.M.; Rengarajan, R. (Elsevier, 2005)A drifting sediment trap was deployed and sup(234)Th activity in the water column was measured to calculate export flux of carbon at a time-series station in the northern Arabian Sea (lat. 21 degrees 30 minutes N; long. ... -
Iron fertilization enhanced net community production but not downward particle flux during the Southern Ocean iron fertilization experiment LOHAFEX
Martin, P.; Loeff, M.M.R. van der.; Cassar, N.; Vandromme, P.; d'Ovidio, F.; Stemmann, L.; Rengarajan, R.; Soares, M.A.; Gonzalez, H.E.; Ebersbach, F.; Lampitt, R.S.; Sanders, R.; Barnett, B.A.; Smetacek, V.; Naqvi, S.W.A. (American Geophysical Union, 2013)A closed eddy core in the Subantarctic Atlantic Ocean was fertilized twice with two tons of iron (as FeSO<sub>4</sub>), and the 300 km<sup>2</sup> fertilized patch was studied for 39 days to test whether fertilization ... -
POC export fluxes in the Arabian Sea and the Bay of Bengal: A simultaneous 234Th/238U and 210Po/210Pb study
Anand, S.S.; Rengarajan, R.; Shenoy, D.M.; Gauns, M.; Naqvi, S.W.A. (Elsevier, 2018)Seasonal variation in POC export flux, from the upper ocean, was studied during post southwest monsoon (October-November 2013) and spring intermonsoon (May 2014) at selected locations in the central and southern Arabian ... -
Spatial variability in dissolved iron concentrations in the marginal and open waters of the Indian Ocean
Chinni, V.; Singh, S.K.; Bhushan, R.; Rengarajan, R.; Sarma, V.V.S.S. (Elsevier, 2019)We analyzed 28 full vertical profiles of dissolved iron (DFe) in the Indian Ocean (i.e., between 26°S – 20°N and 72°E – 105°E) during two research expeditions (SK-304: March–May 2013, SK-311: March–April 2014) as part of ... -
Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle-reactive 234 Th
Anand, S.S.; Rengarajan, R.; Sarma, V.V.S.S.; Sudheer, A.K.; Bhushan, R.; Singh, S.K. (Wiley, 2017)The northern Indian Ocean is globally significant for its seasonally reversing winds, upwelled nutrients, high biological production, and expanding oxygen minimum zones. The region acts as sink and source for atmospheric ... -
Submarine groundwater discharge and nutrient addition to the coastal zone of the Godavari estuary
Rengarajan, R.; Sarma, V.V.S.S. (Elsevier, 2015)Submarine groundwater discharge (SGD) represents a significant pathway of materials between land and sea, especially as it supplies nutrients, carbon and trace metals to coastal waters. To estimate SGD fluxes to the Godavari ... -
Sulfidization processes in seasonally hypoxic shelf sediments: A study off the West coast of India
Fernandes, Svetlana; Mazumdar, A.; Peketi, A.; Anand, S.S.; Rengarajan, R.; Jose, A.; Manaskanya, A.; Carvalho, M.A.; Shetty, D. (Elsevier Ltd, 2020)Continental shelves are the major sites for organic carbon burial and sulfate reduction. Organic carbon degradation and sulfidization along continental shelves are expected to play a significant role in global carbon-sulfur-iron ... -
sup(234) Th scavenging and particle export fluxes from the upper 100 m of the Arabian Sea
Sarin, M.M.; Rengarajan, R.; Ramaswamy, V. (Current Science Association, Bangalore, India, 1996)We have determined the particle scavenging rates, export fluxes of sup(234) Th and settling particles from the upper 100 m of the Arabian Sea as a part of the JGOFS (India) Programme. The spatial and temporal measurements ...