Stratospheric variability contributed to and sustained the recent hiatus in Eurasian winter warming.

ABSTRACT: The recent hiatus in global-mean surface temperature warming was characterized by a Eurasian winter cooling trend, and the cause(s) for this cooling is unclear. Here we show that the observed hiatus in Eurasian warming was associated with a recent trend toward weakened stratospheric polar vortices. Specifically, by calculating the change in Eurasian surface air temperature associated with a given vortex weakening, we demonstrate that the recent trend toward weakened polar vortices reduced the anticipated Eurasian warming due to increasing greenhouse gas concentrations. Those model integrations whose stratospheric vortex evolution most closely matches that in reanalysis data also simulate a hiatus. While it is unclear whether the recent weakening of the midwinter stratospheric polar vortex

SUBMITTER: Garfinkel CI 

PROVIDER: S-EPMC5349291 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature