Performance of a new 1MV AMS facility (AURiS) at PRL, Ahmedabad, India

Bhushan, Ravi; Yadava, M. G.; Shah, Manan; Raj, Harsh

doi:10.1016/j.nimb.2018.12.003

Cited by 29 publications

(10 citation statements)

References 16 publications

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“…Before AMS radiocarbon measurement, the sediment samples were powdered and decarbonated using hydrochloric acid at 85°C. The sample residues were then graphitized using an automated graphitization equipment (Němec et al, 2010;Wacker et al, 2010) and were measured using the AMS (Bhushan et al, 2019a(Bhushan et al, , 2019b. The obtained radiocarbon ages were calibrated using INTCAL 20 (Reimer et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

A 2600-yr multiproxy record for climate and vegetation reconstruction along the Mahanadi River delta, east coast of India

et al. 2023

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Understanding the impact of climate change on the vegetation cover in the past is crucial for predicting the future warming scenario and its consequences. The present study integrates biotic (palynological analysis) and abiotic proxy (sediment chemistry, clay mineral assemblages and grain size end member (EM) analysis) records in a chronologically constrained sedimentary sequence from the southeastern part of the Mahanadi River delta to reconstruct the hydroclimate since 2600 years. The Mahanadi delta sediments are primarily derived from felsic rock source possibly composed of granites or granulites. The dominance of herbaceous taxa, high aridity index and deposition of fine grain (EM1) sediment possibly suggest a relatively cold and dry climate in the study region during ~2600–2100 cal yr BP corresponding to the Iron Age Cold Period (IACP). Presence of diverse mangrove and tree taxa, deposition of coarser sediment (EM3) and relatively high abundance of secondary clay minerals possibly indicate high precipitation associated with the Roman Warm Period (RWP, ~2100–1800 cal yr BP). A decline in mangroves, dominance of herbaceous taxa and high deposition of fine grain (EM2) sediment from ~1800 to 1300 cal yr BP may indicate a relatively drier climate coinciding with the Dark Age Cold Period (DACP). High moisture index and an increased value of Rb/Sr during ~1300 cal yr BP may suggest a wet phase with the onset of the Medieval Climatic Anomaly (MCA) and later shifted to an arid climate during ~1100–800 cal yr BP. After ~800 cal yr BP, a sharp decline in all weathering indices and vegetation cover, dominance of illite indicates a relatively dry climate which could mark the Little Ice Age (LIA, ~800–300 cal yr BP). A small increase in the terrestrial flux, as well as the weathering indices after ~300 cal yr BP, may suggest the onset of recent warming.

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Section: Methodsmentioning

confidence: 99%

A 2600-yr multiproxy record for climate and vegetation reconstruction along the Mahanadi River delta, east coast of India

et al. 2023

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“…Sediment samples were crushed and treated with diluted hydrochloric acid solution at 85 C to remove inorganic carbonate. Samples were graphitized using an Automated Graphitization Equipment (N emec et al 2010;Wacker et al 2010) and were measured using the Accelerator Mass Spectrometer established at Physical Research Laboratory, Ahmedabad (AURiS) (Bhushan et al 2019a(Bhushan et al , 2019b. The obtained radiocarbon ages were calibrated in Calib 7.1 (Stuiver and Reimer 1993;Reimer et al 2013).…”

Section: Methodsmentioning

confidence: 99%

Coastal vegetation dynamics in response to climatic and relative sea level changes in Mahanadi River delta, NE coast of India

et al. 2023

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This research assesses the impacts of climate change and relative sea level (RSL) fluctuations on coastal vegetation during the past 2000 years along the Mahanadi River delta, northeast coast of India. Sediment samples of a 2.6 m trench from Barhatubi area located in the lower flood plain of Mahanadi River delta were studied for sedimentological and pollen analysis. Mangrove succession can be divided into three zones: (1) Freshwater marsh (∼1980–1420 cal yr BP); (2) Tidal flat (∼1420–770 cal yr BP) and (3) Landward mangrove margin (∼770 cal yr BP-Present). A transgressive shift from floodplain freshwater marsh to a tidal flat is recorded between ∼1980–1420 cal yr BP which is evidenced by upland tree taxa, Poaceae, pteridophyte and fungal spores along with low percentage of mangroves such as Avicennia, Sonneratia and Rhizophora representing the landward edge of the tidal region. Dominance of Sonneratia and a decline in terrestrial taxa reflects a rise in the relative sea level around ∼1420 cal yr BP with less freshwater input from land suggesting a weakened monsoon condition. After ∼770 cal yr BP, an overall regressive phase with small cycles of relative sea level rise/fall has been observed due to the dominance of salt tolerant Avicennia along with Rhizophora, Excoecaria agallocha and Aegialitis rotundifolia alternating with Sonneratia and other marine palynomorphs.

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“…Oxalic acid standard (HOxII) is the primary standard used for normalizing sample 14 C content, whereas VIRI-R was used as a check standard. The graphitized samples and standards were pressed into targets and measured at PRL Accelerator Mass Spectrometer facility (PRL-AURiS; Bhushan et al 2019aBhushan et al , 2019b. Each target was measured for 10 cycles of 10,000 14 C counts, with total of at least 100,000 14 C counts.…”

Section: Methodsmentioning

confidence: 99%

Marine Reservoir Age Correction for the Andaman Basin

et al. 2020

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Marine reservoir age is an important component for correction in radiocarbon (14C) dating of marine and coastal samples. 14C concentration in pre-bomb marine samples of known age are used to derive marine reservoir age of a region. Annually banded coral from Landfall island in the northern Andaman has been analyzed for its 14C concentration during the pre-bomb period 1948–1951. 14C age and reservoir effect (∆R) are reported for these pre-bomb coral samples from the northern Andaman region. The mean 14C age of 331 ± 61 yr BP was obtained for the period 1948–1951 with an average reservoir age correction of –138 ± 61 yr. This reservoir age correction is lowest reported from the northern Indian Ocean. ∆R value of the northern Andaman and the Bay of Bengal appears lower than that of southern Andaman. The ∆R values obtained using mollusk shells and coral from the Andaman region shows large variability. The lower reservoir age correction for the Landfall Island situated in the northern part of the Andaman archipelago, could result due to freshwater flux and reduced upwelling in the region.

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Performance of a new 1MV AMS facility (AURiS) at PRL, Ahmedabad, India

Cited by 29 publications

References 16 publications

A 2600-yr multiproxy record for climate and vegetation reconstruction along the Mahanadi River delta, east coast of India

A 2600-yr multiproxy record for climate and vegetation reconstruction along the Mahanadi River delta, east coast of India

Coastal vegetation dynamics in response to climatic and relative sea level changes in Mahanadi River delta, NE coast of India

Marine Reservoir Age Correction for the Andaman Basin

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