Coupling of thermocline depth and strength of the Indian, summer monsoon during deglaciation

Journal of earth system science

Sushant S Naik^1¹ 

[1] CSIR–National Institute of Oceanography, Dona Paula, Goa 403 004, India.^1

关键词: Monsoon;    the Bay of Bengal;    thermocline;    foraminifera;    salinity;    isotopes;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

We investigated the variations in thermocline depth using the difference in $\delta^{18}$Oc values between the two species of planktonic foraminifera, surface dwelling Globigerinoides ruber (s.s.) and thermocline dwelling Neogloboqudrina dutertrei, covering a time span of 9–23 kyr from the sediment core SK218/1 from the western Bay of Bengal (BoB). Here we show that during the strong phase of the Indian summer monsoon (12–9 kyr), a strong stratification leads to a shallow mixed layer and thermocline depth in the BoB as evident from higher $\Delta\delta^{18}$O between the mixed layer and thermocline dwelling planktonic foraminifera species. Thus, a strong coupling between the Indian summer monsoon and thermocline depth in the BoB prevailed at a millennial time scale.

【 授权许可】

CC BY