The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability
Stratospheric variability is examined in a vertically extended version of the Met Office global climate model. Equatorial variability includes the simulation of an internally generated quasi-biennial oscillation (QBO) and semiannual oscillation (SAO). Polar variability includes an examination of the...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
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2010
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| _version_ | 1826261296601890816 |
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| author | Osprey, S Gray, L Hardiman, S Butchart, N Bushell, A Hinton, T |
| author_facet | Osprey, S Gray, L Hardiman, S Butchart, N Bushell, A Hinton, T |
| author_sort | Osprey, S |
| collection | OXFORD |
| description | Stratospheric variability is examined in a vertically extended version of the Met Office global climate model. Equatorial variability includes the simulation of an internally generated quasi-biennial oscillation (QBO) and semiannual oscillation (SAO). Polar variability includes an examination of the frequency of sudden stratospheric warmings (SSW) and annular mode variability. Results from two different horizontal resolutions are also compared. Changes in gravity wave filtering at the higher resolution result in a slightly longerQBOthat extends deeper into the lower stratosphere.At the higher resolution there is also a reduction in the occurrence rate of sudden stratospheric warmings, in better agreement with observations. This is linked with reduced levels of resolved waves entering the high-latitude stratosphere. Covariability of the tropical and extratropical stratosphere is seen, linking the phase of the QBO with disturbed NH winters, although this linkage is sporadic, in agreement with observations. Finally, tropospheric persistence time scales and seasonal variability for the northern and southern annular modes are significantly improved at the higher resolution, consistent with findings from other studies. © 2010 American Meteorological Society. |
| first_indexed | 2024-03-06T19:19:13Z |
| format | Journal article |
| id | oxford-uuid:197a027a-1f46-40d1-835a-a65014340986 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:19:13Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:197a027a-1f46-40d1-835a-a650143409862022-03-26T10:49:17ZThe Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: VariabilityJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:197a027a-1f46-40d1-835a-a65014340986EnglishSymplectic Elements at Oxford2010Osprey, SGray, LHardiman, SButchart, NBushell, AHinton, TStratospheric variability is examined in a vertically extended version of the Met Office global climate model. Equatorial variability includes the simulation of an internally generated quasi-biennial oscillation (QBO) and semiannual oscillation (SAO). Polar variability includes an examination of the frequency of sudden stratospheric warmings (SSW) and annular mode variability. Results from two different horizontal resolutions are also compared. Changes in gravity wave filtering at the higher resolution result in a slightly longerQBOthat extends deeper into the lower stratosphere.At the higher resolution there is also a reduction in the occurrence rate of sudden stratospheric warmings, in better agreement with observations. This is linked with reduced levels of resolved waves entering the high-latitude stratosphere. Covariability of the tropical and extratropical stratosphere is seen, linking the phase of the QBO with disturbed NH winters, although this linkage is sporadic, in agreement with observations. Finally, tropospheric persistence time scales and seasonal variability for the northern and southern annular modes are significantly improved at the higher resolution, consistent with findings from other studies. © 2010 American Meteorological Society. |
| spellingShingle | Osprey, S Gray, L Hardiman, S Butchart, N Bushell, A Hinton, T The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability |
| title | The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability |
| title_full | The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability |
| title_fullStr | The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability |
| title_full_unstemmed | The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability |
| title_short | The Climatology of the Middle Atmosphere in a Vertically Extended Version of the Met Office's Climate Model Part II: Variability |
| title_sort | climatology of the middle atmosphere in a vertically extended version of the met office s climate model part ii variability |
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