The Effect of Indian Ocean Surface Freshwater Flux Biases On the Multi-Stable Regime of the AMOC

Henk A. Dijkstra*, René M. van Westen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

It is known that global climate models (GCMs) have substantial biases in the surface freshwater flux. Using numerical bifurcation analyses on a global ocean model, we study here the effect of freshwater flux biases over the Indian Ocean on the multiple equilibrium regime of the Atlantic Meridional Overturning Circulation (AMOC). We find that a (positive) freshwater flux bias over the Indian Ocean shifts the multiple equilibrium regime to larger values of North Atlantic freshwater input but hardly affects the associated hysteresis width. The magnitude of this shift depends on the way the anomalous North Atlantic freshwater flux is compensated. The changes in bifurcation diagrams can be explained from the overall freshwater balance over the Atlantic basin.

Original languageEnglish
Pages (from-to)90-100
Number of pages11
JournalTellus, Series A: Dynamic Meteorology and Oceanography
Volume76
Issue number1
DOIs
Publication statusPublished - 2024

Keywords

  • Atlantic Ocean Circulation
  • Bifurcation Analysis
  • Freshwater Flux Biases

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