Premium
Impact of the stratosphere on tropospheric climate change
Author(s) -
Sigmond Michael,
Scinocca John F.,
Kushner Paul J.
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl033573
Subject(s) - stratosphere , atmospheric sciences , orographic lift , climatology , environmental science , troposphere , atmospheric circulation , atmospheric model , climate model , orography , atmospheric models , meteorology , climate change , geology , physics , atmosphere (unit) , precipitation , oceanography
The atmospheric circulation response to CO 2 doubling in various versions of an atmospheric general circulation model (AGCM) without a well‐resolved stratosphere (“low‐top” model), is compared to the response in a version of the same AGCM with a well‐resolved stratosphere (“high‐top” model). The doubled CO 2 response of the “best‐tuned” (i.e. operational) low‐top model version is significantly different from that in the best‐tuned high‐top model version. Additional experiments show that this difference is not caused by the model lid height, but instead can be mainly attributed to differences in the settings of parameterized orographic gravity‐wave drag which control the strength of the zonal wind in the mid‐ to high‐latitude lower stratosphere and the mean sea‐level pressure distribution. These findings suggest a link between the strength of the winds in the mid‐ to high‐latitude lower stratosphere and tropospheric annular mode responses, and have implications for how to proceed with high‐top low‐top model intercomparisons.