Impact of the stratosphere on tropospheric climate change
The atmospheric circulation response to CO2 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 doub...
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| Format: | Article |
| Language: | English |
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Wiley
2008-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2008GL033573 |
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| author | Michael Sigmond John F. Scinocca Paul J. Kushner |
| author_facet | Michael Sigmond John F. Scinocca Paul J. Kushner |
| author_sort | Michael Sigmond |
| collection | DOAJ |
| description | The atmospheric circulation response to CO2 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 CO2 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. |
| format | Article |
| id | doaj-art-29927e09f6fc46ffb597e23b0c1b9783 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2008-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-29927e09f6fc46ffb597e23b0c1b97832025-08-20T03:08:01ZengWileyGeophysical Research Letters0094-82761944-80072008-06-013512n/an/a10.1029/2008GL033573Impact of the stratosphere on tropospheric climate changeMichael Sigmond0John F. Scinocca1Paul J. Kushner2Department of Physics University of Toronto Toronto, Ontario CanadaCanadian Centre for Climate Modelling and Analysis Meteorological Service of Canada Victoria, British Columbia CanadaDepartment of Physics University of Toronto Toronto, Ontario CanadaThe atmospheric circulation response to CO2 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 CO2 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.https://doi.org/10.1029/2008GL033573stratosphere‐troposphere couplingclimate change |
| spellingShingle | Michael Sigmond John F. Scinocca Paul J. Kushner Impact of the stratosphere on tropospheric climate change Geophysical Research Letters stratosphere‐troposphere coupling climate change |
| title | Impact of the stratosphere on tropospheric climate change |
| title_full | Impact of the stratosphere on tropospheric climate change |
| title_fullStr | Impact of the stratosphere on tropospheric climate change |
| title_full_unstemmed | Impact of the stratosphere on tropospheric climate change |
| title_short | Impact of the stratosphere on tropospheric climate change |
| title_sort | impact of the stratosphere on tropospheric climate change |
| topic | stratosphere‐troposphere coupling climate change |
| url | https://doi.org/10.1029/2008GL033573 |
| work_keys_str_mv | AT michaelsigmond impactofthestratosphereontroposphericclimatechange AT johnfscinocca impactofthestratosphereontroposphericclimatechange AT pauljkushner impactofthestratosphereontroposphericclimatechange |