Glacial-interglacial changes in the surface water characteristics of the Andaman Sea: Evidence from stable ratios of planktonic foraminifera

Journal of Earth system science

B R Rao2³  D J Patil1¹  G Rajagopalan3²  P S Rao2³  B N Nath2³  S M Ahmad1¹ 

[1] National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, India.$$;Birbal Sahni Institute of Palaeobotany, Lucknow 226 007, India.$$;National Institute of Oceanography, Dona Paula, Goa 403 004, India.$$

关键词: Stable isotopes;    Younger Dryas;    deglaciation;    holocene;    last glacial maximum (LGM).;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Stable carbon and oxygen isotopic analyses of the planktonic foraminifera (Globigerinoides ruber) from a deep sea sediment core (GC-1) in the Andaman Sea show high glacial-to-Holocene 𝛿180 amplitude of 2.1% which is consistent with previously published records from this marginal basin and suggest increased salinity and/or decreased temperature in the glacial surface waters of this region.A pulse of 18O enrichment during the last deglaciation can be attributed to a Younger Dryas cooling event and/or to a sudden decrease of fresh water influx from the Irrawady and Salween rivers into the Andaman Sea. High 𝛿13C values observed during the isotopic stages 2 and 4 are probably due to the enhanced productivity during glacial times in the Andaman Sea.

【 授权许可】

Unknown