Linkages between Arctic sea-ice changes and atmospheric circulation patterns in reanalysis data and model simulations


Contact
Ralf.Jaiser [ at ] awi.de

Abstract

Observed global warming trends have their maximum in Arctic regions, a phenomenon referred to as Arctic Amplification. Consequently, Arctic sea ice shows a strong decreasing trend. These changes imprint modifications on atmospheric flow patterns not only in Arctic regions themselves. Changes of teleconnections and planetary scale motions like Rossby waves affect mid-latitude climate as well. The application of a cluster analysis revealed two circulation patterns that occur more frequently for low Arctic sea ice conditions: a Scandinavian blocking in December and January and a negative North Atlantic Oscillation pattern in February and March. The first pattern is related to enhanced upward wave propagation in this region and period. These waves reach the stratosphere and disturb the polar vortex. The downward response is again linked to the higher frequency of negative NAO events in late winter. These results are consistent in reanalysis data and model simulations.



Item Type
Conference (Invited talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
The International Workshop Polar Climate Change, 23 Oct 2017 - 24 Oct 2017, Nanjing, China.
Eprint ID
45773
Cite as
Jaiser, R. , Handorf, D. , Crasemann, B. , Romanowsky, E. , Dethloff, K. , Nakamura, T. , Ukita, J. and Yamazaki, K. (2017): Linkages between Arctic sea-ice changes and atmospheric circulation patterns in reanalysis data and model simulations , The International Workshop Polar Climate Change, Nanjing, China, 23 October 2017 - 24 October 2017 .


Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item