Stratospheric response to Arctic sea ice retreat and associated planetary wave propagation changes

The stratospheric response to the observed Arctic sea ice retreat is analysed based on European Centre for Medium-Range Weather Forecast (ECMWF) Re-Analysis Interim (ERA-Interim) atmospheric data from 1979–2012. It is shown that changes in August/September sea ice concentration impact on...

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Bibliographic Details
Published in:Tellus A: Dynamic Meteorology and Oceanography
Main Authors: Ralf Jaiser, Klaus Dethloff, Dörthe Handorf
Format: Article in Journal/Newspaper
Language:English
Published: Taylor & Francis Group 2013
Subjects:
Arctic sea ice retreat
planetary wave propagation
polar vortex
Arctic oscillation
Oceanography
GC1-1581
Meteorology. Climatology
QC851-999
Arctic
Pacific
Sea ice
Online Access:https://doi.org/10.3402/tellusa.v65i0.19375
https://doaj.org/article/fefabdea35da4ac6b455dc5b4658342d
Description
Summary:The stratospheric response to the observed Arctic sea ice retreat is analysed based on European Centre for Medium-Range Weather Forecast (ECMWF) Re-Analysis Interim (ERA-Interim) atmospheric data from 1979–2012. It is shown that changes in August/September sea ice concentration impact on tropospheric and stratospheric geopotential heights in the following winter. During low ice phases a negative tropospheric Arctic Oscillation pattern is found, which is connected to a weakened stratospheric polar vortex and warmer stratospheric temperatures. Furthermore, the analysis reveals enhanced upward EP fluxes due to planetary waves for low ice conditions. Strong stratospheric anomalies in the Atlantic/European region are associated with a weaker polar vortex. Low ice periods are connected with additional tropospheric wave energy excitation in the Pacific/North America region and influence the stratosphere through three-dimensional planetary wave propagation.

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