TY - JOUR
T1 - Paleoproductivity variations in the equatorial Arabian Sea
T2 - Implications for East African and Indian summer rainfalls and the el NIÑO frequency
AU - Tiwari, Manish
AU - Ramesh, Rengaswamy
AU - Bhushan, Ravi
AU - Somayajulu, B. L.K.
AU - Jull, A. J.Timothy
AU - Burr, George S.
PY - 2006
Y1 - 2006
N2 - We analyzed a sediment core from the equatorial Arabian Sea, chronologically constrained by accurate accelerator mass spectrometry (AMS) radiocarbon dates on selected planktonic foraminiferal species, for paleoproductivity variations corresponding to the variations in the Indian Ocean Equatorial Westerlies (IEW). The IEW in turn are positively correlated to the Southern Oscillation Index (SOI), which is a measure of El Niño, Southwest monsoon (SWM), and east African rainfall (EAR). The productivity data show that Indian and east African rainfalls declined from 35,000 calendar yr BP up to the last glacial maximum (LGM), with the maximum El Niño frequency during the last glacial period. From -14,500 to ∼2000 calendar yr BP (i.e. core top), we find strengthening SWM and EAR along with declining El Niño frequency.
AB - We analyzed a sediment core from the equatorial Arabian Sea, chronologically constrained by accurate accelerator mass spectrometry (AMS) radiocarbon dates on selected planktonic foraminiferal species, for paleoproductivity variations corresponding to the variations in the Indian Ocean Equatorial Westerlies (IEW). The IEW in turn are positively correlated to the Southern Oscillation Index (SOI), which is a measure of El Niño, Southwest monsoon (SWM), and east African rainfall (EAR). The productivity data show that Indian and east African rainfalls declined from 35,000 calendar yr BP up to the last glacial maximum (LGM), with the maximum El Niño frequency during the last glacial period. From -14,500 to ∼2000 calendar yr BP (i.e. core top), we find strengthening SWM and EAR along with declining El Niño frequency.
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U2 - 10.1017/S0033822200035360
DO - 10.1017/S0033822200035360
M3 - Article
AN - SCOPUS:33645215630
SN - 0033-8222
VL - 48
SP - 17
EP - 29
JO - Radiocarbon
JF - Radiocarbon
IS - 1
ER -