Isentropic zonal average formalism and the near-surface circulation
The isentropic zonal average formalism is extended to include a rigorous treatment of the bottom boundary of the atmosphere. We define a ‘surface zone’, where isentropes in the latitudinal plane are interrupted by the earth's surface. The zonal average equations of motion and their time average...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | English |
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2013
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| Online Access: | https://hdl.handle.net/10356/95692 http://hdl.handle.net/10220/8964 |
| _version_ | 1826126994800115712 |
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| author | Koh, Tieh Yong. Plumb, R. Alan. |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Koh, Tieh Yong. Plumb, R. Alan. |
| author_sort | Koh, Tieh Yong. |
| collection | NTU |
| description | The isentropic zonal average formalism is extended to include a rigorous treatment of the bottom boundary of the atmosphere. We define a ‘surface zone’, where isentropes in the latitudinal plane are interrupted by the earth's surface. The zonal average equations of motion and their time average in isentropic coordinates are rederived in the presence of the surface zone. Applying the extended formalism to a baroclinic wave model, we show that near-surface equatorward mean flow is driven by eastward surface form drag in isentropic coordinates, which in turn is related to poleward geostrophic potential temperature flux at the surface. A potential vorticity–potential temperature picture of extratropical general circulation dynamics above and within the surface zone is presented. We highlight the importance of poleward mean flow in the upper region of the surface zone and investigate the antisymmetric distribution of mean meridional mass flow about the median potential temperature of surface air. |
| first_indexed | 2024-10-01T07:01:51Z |
| format | Journal Article |
| id | ntu-10356/95692 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:01:51Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/956922020-03-07T12:37:20Z Isentropic zonal average formalism and the near-surface circulation Koh, Tieh Yong. Plumb, R. Alan. School of Physical and Mathematical Sciences DRNTU::Science::Physics::Meteorology and climatology The isentropic zonal average formalism is extended to include a rigorous treatment of the bottom boundary of the atmosphere. We define a ‘surface zone’, where isentropes in the latitudinal plane are interrupted by the earth's surface. The zonal average equations of motion and their time average in isentropic coordinates are rederived in the presence of the surface zone. Applying the extended formalism to a baroclinic wave model, we show that near-surface equatorward mean flow is driven by eastward surface form drag in isentropic coordinates, which in turn is related to poleward geostrophic potential temperature flux at the surface. A potential vorticity–potential temperature picture of extratropical general circulation dynamics above and within the surface zone is presented. We highlight the importance of poleward mean flow in the upper region of the surface zone and investigate the antisymmetric distribution of mean meridional mass flow about the median potential temperature of surface air. 2013-01-30T09:06:58Z 2019-12-06T19:19:57Z 2013-01-30T09:06:58Z 2019-12-06T19:19:57Z 2004 2004 Journal Article Koh, T. Y., & Plumb, R. (2004). Isentropic zonal average formalism and the near-surface circulation. Quarterly Journal of the Royal Meteorological Society, 130(600), 1631-1653. https://hdl.handle.net/10356/95692 http://hdl.handle.net/10220/8964 10.1256/qj.02.219 en Quarterly journal of the royal meteorological society © 2004 Royal Meteorological Society. |
| spellingShingle | DRNTU::Science::Physics::Meteorology and climatology Koh, Tieh Yong. Plumb, R. Alan. Isentropic zonal average formalism and the near-surface circulation |
| title | Isentropic zonal average formalism and the near-surface circulation |
| title_full | Isentropic zonal average formalism and the near-surface circulation |
| title_fullStr | Isentropic zonal average formalism and the near-surface circulation |
| title_full_unstemmed | Isentropic zonal average formalism and the near-surface circulation |
| title_short | Isentropic zonal average formalism and the near-surface circulation |
| title_sort | isentropic zonal average formalism and the near surface circulation |
| topic | DRNTU::Science::Physics::Meteorology and climatology |
| url | https://hdl.handle.net/10356/95692 http://hdl.handle.net/10220/8964 |
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