Global and Arctic climate sensitivity enhanced by changes in North Pacific heat flux

Nature Communications
By: , and 

Links

Abstract

Arctic amplification is a consequence of surface albedo, cloud, and temperature feedbacks, as well as poleward oceanic and atmospheric heat transport. However, the relative impact of changes in sea surface temperature (SST) patterns and ocean heat flux sourced from different regions on Arctic temperatures are not well constrained. We modify ocean-to-atmosphere heat fluxes in the North Pacific and North Atlantic in a climate model to determine the sensitivity of Arctic temperatures to zonal heterogeneities in northern hemisphere SST patterns. Both positive and negative ocean heat flux perturbations from the North Pacific result in greater global and Arctic surface air temperature anomalies than equivalent magnitude perturbations from the North Atlantic; a response we primarily attribute to greater moisture flux from the subpolar extratropics to Arctic. Enhanced poleward latent heat and moisture transport drive sea-ice retreat and low-cloud formation in the Arctic, amplifying Arctic surface warming through the ice-albedo feedback and infrared warming effect of low clouds. Our results imply that global climate sensitivity may be dependent on patterns of ocean heat flux in the northern hemisphere.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Global and Arctic climate sensitivity enhanced by changes in North Pacific heat flux
Series title Nature Communications
DOI 10.1038/s41467-018-05337-8
Volume 9
Year Published 2018
Language English
Publisher Nature
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description Article number 3124; 12 p.
First page 1
Last page 12