New Studies Conducted To Understand Modern Form Of Global Overturning Circulation

Current Affairs

  • GOC refers to the equatorward transport of cold, deep waters and poleward transport of warm, near-surface waters.
  • It is responsible for the transport of carbon and heat among ocean basins and between the ocean and the atmosphere.
  • GOC is a system of two connected overturning cells:-
  • The upper cell is linked to the formation of North Atlantic Deep Water (NADW) and its shallower return flow to form Atlantic Meridional Overturning Circulation (AMOC).
  • The lower cell (referred to as Southern Ocean Meridional Overturning Circulation) is associated with the formation of Antarctic Bottom Water (AMM) and its return flow as Pacific Deep Water (PDW).
  • Studies have indicated that tectonically driven changes in ocean gateways such as the closure of the Central American Seaway (CAS), since the late Miocene period, had impacted GOC.

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