The impacts of the Indonesian Throughflow on the inter‐basin seesaw mechanism, in idealized experiments

• Published in: International Journal of Climatology
• Main Authors: Santis, Wlademir, Aímola, Luis, Castellanos, Paola, Campos, Edmo J. D.
• Other Authors: Brazilian National Council of Scientific and Technologic Development (CNPq), Vale Institute of Technology (ITV), São Paulo State Foundation for Research Support (FAPESP), Spanish government
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2018
• Subjects: Pacific; NADW; North Atlantic Deep Water; North Atlantic
• Online Access: http://dx.doi.org/10.1002/joc.5424; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.5424; https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.5424

ABSTRACT The role that the Indonesian Throughflow plays on climate is investigated in an alternative scenario, expected during glacial ages. The equatorwards shift of the Southern Hemisphere westerlies found in glacial ages acts to decrease the Agulhas Leakage (AL) and the thermohaline circulation (THC) in the Atlantic. Recent results suggest that these changes are followed by an increased THC in the Pacific, through an inter‐basin seesaw mechanism. The enhanced circulation in the Pacific demands thermocline water to cross the equator towards northern latitudes, which shifts the water source of the throughflow from the low‐salinity North Pacific to the relative saltier South Pacific. It is shown that in this equilibrium, the salinity anomalies of the throughflow impact the inter‐basin seesaw towards the restoration of the modern climate, enhancing the North Atlantic Deep Water (NADW) formation and decreasing the THC in the Pacific. These results are consistent with paleo‐observations and provide new insights to interpreting the climate changes in glacial periods.