hdl:10013/epic.22024
publisher:10.1016/j.asr.2005.02.065

Middle atmosphere summer duration as an indicator of long-term circulation changes


Offermann, D, Jarisch, M, Donner, M, Oberheide, J, Wohltmann, I, Garcia, R, Marsh, D, Naujokat, B and Winkler, P ;
Contact
iwohltmann [ at ] awi-potsdam.de

Abstract

Summer duration (SD) is defined here as the time interval between spring and autumn turn around of zonal winds in the stratosphere. SD long-term trends are obtained from analysis of middle stratosphere NCEP and ECMWF data. They are found to be dependent on latitude and altitude. Wind data are available since 1948. The corresponding analysis suggests a breakpoint in the trend at around 1980: SD increases before 1980, and decreases afterwards. Corresponding changes of stratospheric wave activity are analyzed and found to be a major contribution to the SD trends. Long-term computer runs of the Whole Atmosphere Community Climate Model (WACCM 1b) are consistent with these results.



Item Type
Conference (Paper)
Authors
Offermann, D, Jarisch, M, Donner, M, Oberheide, J, Wohltmann, I, Garcia, R, Marsh, D, Naujokat, B and Winkler, P ;
Divisions
AWI Organizations > Climate Sciences > Atmospheric Physics
Programs
Helmholtz Research Programs > MARCOPOLI (2004-2008) > MAR-MARCOPOLI
Helmholtz Research Programs > MARCOPOLI (2004-2008) > MAR1-Decadal Variability and Global Change
Publication Status
Published
Eprint ID
11572
DOI https://www.doi.org/10.1016/j.asr.2005.02.065

Cite as
Offermann, D. , Jarisch, M. , Donner, M. , Oberheide, J. , Wohltmann, I. , Garcia, R. , Marsh, D. , Naujokat, B. and Winkler, P. (2005): Middle atmosphere summer duration as an indicator of long-term circulation changes , Advances in Space Research doi: https://www.doi.org/10.1016/j.asr.2005.02.065


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