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The monsoonal signal dominates most climate records from the Indian Ocean. As a consequence, conventional stable isotope tracers have not been effective at tracking ocean circulation in the Indian Ocean and distinguishing between monsoonal and ocean circulation changes in the Bay of Bengal. Here we present a deglacial through Holocene Nd isotope record of seawater in the central Bay of Bengal, spanning the last 16 kyr. Comparison with a published record from the deep equatorial Indian Ocean (Piotrowski et al., , https://doi.org/10.1016/j.epsl.2009.06.007 shows that Nd isotope ratios of these cores were similar until ~8 ka (ƐNd = −7 to −8 until ~13 ka, and −8.5 to −9.5 between ~13 and 8 ka), after which the Bay of Bengal record diverges to lower values (ƐNd = ~ −10.5). We interpret the Nd isotope record until ~8 ka in both cores to represent the influence of the global overturning ocean circulation. The divergence of the record in the Bay of Bengal since ~8 ka to lower ƐNd values is coincident with a major increase in the strength of the rain‐bearing southwest monsoon and a high sediment load from the Ganga‐Brahmaputra Rivers to the Bengal Fan that reflects major impacts from the intensified monsoon. Thus, the Nd isotopes are sensitive recorders of the changes in monsoon intensity in the Bay of Bengal.
Key Points
Nd isotopes are used as a water mass tracer in the Bay of Bengal
The global overturning circulation controlled the deep circulation in the Bay of Bengal for the major portion of the last deglaciation
After 8‐7 ka, the weathering signal due to enhanced monsoon activity has overwhelmed the deep ocean circulation signal