IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Print this page

Decoupling of the Arctic Oscillation and North Atlantic Oscillation in a warmer climate
Hamouda, M.E.; Pasquero, C.; Tziperman, E. (2021). Decoupling of the Arctic Oscillation and North Atlantic Oscillation in a warmer climate. Nat. Clim. Chang. 11(2): 137-142. https://dx.doi.org/10.1038/s41558-020-00966-8
In: Nature Climate Change. Nature Publishing Group: London. ISSN 1758-678X; e-ISSN 1758-6798, more
Peer reviewed article  

Available in  Authors 

Authors  Top 
  • Hamouda, M.E.
  • Pasquero, C.
  • Tziperman, E.

Abstract
    The North Atlantic Oscillation and the Arctic Oscillation are modes of climate variability affecting temperature and precipitation in the mid-latitudes. Here we use reanalysis data and climate model simulations of historical and warm climates to show that the relationship between the two oscillations changes with climate warming. The two modes are currently highly correlated, as both are strongly influenced by the downward propagation of stratospheric polar vortex anomalies into the troposphere. When considering a very warm climate scenario, the hemispherically defined Arctic Oscillation pattern shifts to reflect variability of the North Pacific storm track, while the regionally defined North Atlantic Oscillation pattern remains stable. The stratosphere remains an important precursor for North Atlantic Oscillation, and surface Eurasian and Aleutian pressure anomalies precede stratospheric anomalies. Idealized general circulation model simulations suggest that these modifications are linked to the stronger warming of the Pacific compared with the slower warming of the Atlantic Ocean.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors