North Atlantic Ocean control on surface heat flux on multidecadal timescales
- 24 July 2013
- journal article
- Published by Springer Science and Business Media LLC in Nature
- Vol. 499 (7459), 464-467
- https://doi.org/10.1038/nature12268
Abstract
Nearly 50 years ago Bjerknes suggested that the character of large-scale air-sea interaction over the mid-latitude North Atlantic Ocean differs with timescales: the atmosphere was thought to drive directly most short-term--interannual--sea surface temperature (SST) variability, and the ocean to contribute significantly to long-term--multidecadal--SST and potentially atmospheric variability. Although the conjecture for short timescales is well accepted, understanding Atlantic multidecadal variability (AMV) of SST remains a challenge as a result of limited ocean observations. AMV is nonetheless of major socio-economic importance because it is linked to important climate phenomena such as Atlantic hurricane activity and Sahel rainfall, and it hinders the detection of anthropogenic signals in the North Atlantic sector. Direct evidence of the oceanic influence of AMV can only be provided by surface heat fluxes, the language of ocean-atmosphere communication. Here we provide observational evidence that in the mid-latitude North Atlantic and on timescales longer than 10 years, surface turbulent heat fluxes are indeed driven by the ocean and may force the atmosphere, whereas on shorter timescales the converse is true, thereby confirming the Bjerknes conjecture. This result, although strongest in boreal winter, is found in all seasons. Our findings suggest that the predictability of mid-latitude North Atlantic air-sea interaction could extend beyond the ocean to the climate of surrounding continents.Keywords
This publication has 31 references indexed in Scilit:
- Aerosols implicated as a prime driver of twentieth-century North Atlantic climate variabilityNature, 2012
- Probability Distribution Characteristics for Surface Air–Sea Turbulent Heat Fluxes over the Global OceanJournal of Climate, 2012
- ICOADS Release 2.5: extensions and enhancements to the surface marine meteorological archiveInternational Journal of Climatology, 2011
- External forcing as a metronome for Atlantic multidecadal variabilityNature Geoscience, 2010
- Metadata from WMO Publication No. 47 and an Assessment of Voluntary Observing Ship Observation Heights in ICOADSJournal of Atmospheric and Oceanic Technology, 2007
- Impact of Atlantic multidecadal oscillations on India/Sahel rainfall and Atlantic hurricanesGeophysical Research Letters, 2006
- A signature of persistent natural thermohaline circulation cycles in observed climateGeophysical Research Letters, 2005
- Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth centuryJournal of Geophysical Research: Solid Earth, 2003
- New Insights into the Ocean Heat Budget Closure Problem from Analysis of the SOC Air–Sea Flux ClimatologyJournal of Climate, 1999
- A Method to Estimate the Statistical Significance of a Correlation When the Data Are Serially CorrelatedJournal of Climate, 1997