Coupled Modes of North Atlantic Ocean-Atmosphere Variability and the Onset of the Little Ice Age

Kevin J. Anchukaitis, Edward R. Cook, Benjamin I. Cook, Jessie Pearl, Rosanne D'Arrigo, Rob Wilson

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Hydroclimate extremes in North America, Europe, and the Mediterranean are linked to ocean and atmospheric circulation anomalies in the Atlantic, but the limited length of the instrumental record prevents complete identification and characterization of these patterns of covariability especially at decadal to centennial time scales. Here we analyze the coupled patterns of drought variability on either sides of the North Atlantic Ocean basin using independent climate field reconstructions spanning the last millennium in order to detect and attribute epochs of coherent basin-wide moisture anomalies to ocean and atmosphere processes. A leading mode of broad-scale moisture variability is characterized by distinct patterns of North Atlantic atmosphere circulation and sea surface temperatures. We infer a negative phase of the North Atlantic Oscillation and colder Atlantic sea surface temperatures in the middle of the fifteenth century, coincident with weaker solar irradiance and prior to strong volcanic forcing associated with the early Little Ice Age.

Original languageEnglish (US)
Pages (from-to)12417-12426
Number of pages10
JournalGeophysical Research Letters
Volume46
Issue number21
DOIs
StatePublished - Nov 16 2019

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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