Modern-like deep water circulation in Indian Ocean caused by Central American Seaway closure

Priyesh Prabhat (), Waliur Rahaman (), Nambiyathodi Lathika, Mohd Tarique, Ravi Mishra and Meloth Thamban
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Priyesh Prabhat: National Centre for Polar and Ocean Research, Ministry of Earth Science
Waliur Rahaman: National Centre for Polar and Ocean Research, Ministry of Earth Science
Nambiyathodi Lathika: National Centre for Polar and Ocean Research, Ministry of Earth Science
Mohd Tarique: National Centre for Polar and Ocean Research, Ministry of Earth Science
Ravi Mishra: National Centre for Polar and Ocean Research, Ministry of Earth Science
Meloth Thamban: National Centre for Polar and Ocean Research, Ministry of Earth Science

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Global overturning circulation underwent significant changes in the late Miocene, driven by tectonic forcing, and impacted the global climate. Prevailing hypotheses related to the late Miocene deep water circulation (DWC) changes driven by the closure of the Central American Seaways (CAS) and its widespread impact remains untested due to the paucity of suitable records away from the CAS region. Here, we test the hypothesis of the large-scale circulation changes by providing a high-resolution record of DWC since the late Miocene (11.3 to ~2 Ma) from the north-western Indian Ocean. Our investigation reveals a progressive shift from Pacific-dominated DWC before ~9.0 Ma to the onset of a modern-like DWC system in the Indian Ocean comprising of Antarctic bottom water and northern component water during the Miocene-Pliocene transition (~6 Ma) caused by progressive shoaling of the CAS and suggests its widespread impact.

Date: 2022
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DOI: 10.1038/s41467-022-35145-0

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