Semi-annual to decadal oscillations as recorded at Neumayer research station, Antarctica


Contact
Gert.Koenig-Langlo [ at ] awi.de

Abstract

Monthly time series of temperature, wind speed and sea level pressure recorded at Neumayer polar research station (70°39'S, 8°15'W) during the last 30 years are analysed in order to identify the climate oscillations and associated teleconnection patterns at time scales from half-year to decades. Oscillations with periods of six months (semi-annual) and one year (annual) were identified in all records. Both annual and semi-annual oscillations are non-stationary in time. The dominant pattern of interannual to decadal variability, which captures the out of phase variations of temperature and wind speed with sea level pressure, shows a persistent 2-3 years oscillation. This oscillation is related with a wave-train atmospheric circulation pattern similar to the Pacific South American (PSA) modes. This suggests a tropical origin of this oscillation. The second pattern of interannual to decadal variability, which captures in-phase variations of these variables, shows enhanced variability at 5-6 year time scales. This oscillation is induced by the Antarctic Oscillation (AAO) which shows enhanced variability at these time scales. Analysis of the variability of high resolution stable isotope time series from four ice cores from Neumayer region reveals similar oscillations. This suggests that ice core data from the region could be used to reconstruct the phase and amplitude of atmospheric circulation patterns associated to these oscillations during past periods.



Item Type
Conference (Conference paper)
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
EGU General Assembly 2013, 07 Apr 2013 - 12 Apr 2013, Vienna, Austria.
Eprint ID
36013
Cite as
Rimbu, N. , Lohmann, G. , König-Langlo, G. and Ionita, M. (2013): Semi-annual to decadal oscillations as recorded at Neumayer research station, Antarctica , EGU General Assembly 2013, Vienna, Austria, 7 April 2013 - 12 April 2013 .


Share

Research Platforms

Campaigns


Actions
Edit Item Edit Item