Ekman transport and upwelling during Younger Dryas estimated from wind stress from GENESIS climate model experiments with variable North Atlantic heat convergence

Anna María Ágústsdóttir, Richard B. Alley, David Pollard, William H. Peterson

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Reconstructed climatic changes during the Younger Dryas interval are similar to, but somewhat larger and more wide-spread than, those expected based on the direct atmospheric effects of reduced North Atlantic oceanic heat transport. The paleoclimatic data show that North Atlantic cooling during the Younger Dryas was accompanied by stronger winds in many regions, suggesting that enhanced wind-driven ocean upwelling may have served as a positive feedback on the cooling. We test this hypothesis using the GENESIS atmospheric general circulation model, and find that Younger Dryas-age specified reduction in North Atlantic oceanic heat transport increases tropical Ekman divergence by ≈10% in regions and at times of prominent upwelling, sufficient to affect tropical temperatures.

Original languageEnglish (US)
Article number1999GL900084.
Pages (from-to)1333-1336
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number9
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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