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

Autor:	Jens Oberheide, Daniel R. Marsh, Rolando R. Garcia, P. Winkler, Dirk Offermann, M. Donner, Ingo Wohltmann, M. Jarisch, Barbara Naujokat
Rok vydání:	2005
Předmět:	Atmospheric Science Aerospace Engineering Astronomy and Astrophysics Vegetation Atmospheric sciences Term (time) Latitude Atmosphere Geophysics Altitude Space and Planetary Science Duration (music) General Earth and Planetary Sciences Environmental science Climate model Stratosphere
Zdroj:	Advances in Space Research. 35:1416-1422
ISSN:	0273-1177
Popis:	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. Vegetation data on the ground indicate similar trends with a break.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e512c2fe09ce1b1bfa2a05f72b1ee1e8 https://doi.org/10.1016/j.asr.2005.02.065 Zobrazit plný text záznamu Full Text from ScienceDirect