18 Ka BP records of climatic changes, Bay of Bengal: Isotopic and sedimentological evidences

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dc.contributor.author Chauhan, O.S.
dc.contributor.author Suneethi, J.
dc.date.accessioned 2006-08-28T07:47:38Z
dc.date.available 2006-08-28T07:47:38Z
dc.date.issued 2001
dc.identifier.citation Current Science, vol.81(9), 1231-1234pp.
dc.identifier.uri http://drs.nio.org/drs/handle/2264/274
dc.description.abstract Based upon the oxygen isotopic records of Globigerinoide sacculifer, the clay mineral assemblages and aridity indicator chlorite/illite (C/I) ratio, the palaeoclimatic changes during the past 18 Ka BP have been archived. The results show intense arid climate between 18 and 15 14C Ka BP, a variable climate between 15 and 13 Ka BP, and again an arid climate at 12.5 Ka BP. The negative d18O, reduced C/I and higher smectite document a humid phase culminating at 12 Ka BP. Arid climate phases are also identified at 10.3 and 11.5 Ka BP. The later event matches well with that of the ‘Younger Dryas’ event of world climate models. The beginning of the Holocene is marked by lighter d18O values (at around 9.5 Ka BP), which has been interpreted as onset of a humid phase and high freshwater influx into the bay, correlating with the world climatic event ‘mwp IB’. We also identify two more arid events at ~ 4800 and 2300– 2200 yr, hitherto unreported from the Bay of Bengal.
dc.format.extent 83968 bytes
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher Indian Academy of Sciences
dc.subject Bay of Bengal
dc.subject Monsoon variability
dc.subject Indian Ocean
dc.subject monsoon
dc.title 18 Ka BP records of climatic changes, Bay of Bengal: Isotopic and sedimentological evidences
dc.type Journal Article

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