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

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, Ingo

, Garcia, R., Marsh, R., 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

Article

Authors

Offermann, D., Jarisch, M., Donner, M., Oberheide, J., Wohltmann, Ingo

, Garcia, R., Marsh, R., 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 10.1016/j.asr.2005.02.065

Cite as

Offermann, D. , Jarisch, M. , Donner, M. , Oberheide, J. , Wohltmann, I. , Garcia, R. , Marsh, R. , Naujokat, B. and Winkler, P. (2005): Middle atmosphere summer duration as an indicator of long-term circulation changes , Advances in space research, 35 , pp. 1416-1422 . doi: 10.1016/j.asr.2005.02.065

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