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Paleo-productivity reconstruction in Bay of Bengal during the past 1.3 Ma: Implications for glacial-interglacial dynamics and southern hemispheric processes.

Banerjee B, Mallick M, Kumar V, Babu EVSSK, Luan OZL, Balu G, Kumar TV, Kar NR, Hassan T, Tiwari M, Sakthivel T, Ghosh P, Satyanarayanan M, Krishna AK, Kumar S, Raza W.

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY

https://doi.org/10.1016/j.palaeo.2025.113004 

This study is multi proxy approach to productivity variations in the NW Bay of Bengal. The study states that the increase in productivity after the Mid Pleistocene Transition was most pronounced during the glacial periods and was closely linked to climate variability in the Southern Hemisphere (SH). The productivity in the interglacial periods was low owing to intensified monsoon associated with Northern Hemisphere (NH) climate variability.

Therefore the results infer that NH climate variability (during interglacials,) in tandem with SH climate variability (during glacials) modulates productivity in NW Bay of Bengal.

Figure suggests post-MPT productivity changes were more influenced by polar ice volume than by local SST or global δ¹⁸O. 

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