An Analysis of the Effect of Topography on the Martian Hadley Cells
Previous work with Mars general circulation models (MGCMs) has shown that the north–south slope in Martian topography causes asymmetries in the Hadley cells at equinox and in the annual average. To quantitatively solve for the latitude of the dividing streamline and poleward boundaries of the cells,...
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| Format: | Article |
| Language: | en_US |
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American Meteorological Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/60347 https://orcid.org/0000-0002-6716-1576 |
| _version_ | 1811078066077696000 |
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| author | Plumb, R. Alan Zalucha, Angela Marie Wilson, R. John |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Plumb, R. Alan Zalucha, Angela Marie Wilson, R. John |
| author_sort | Plumb, R. Alan |
| collection | MIT |
| description | Previous work with Mars general circulation models (MGCMs) has shown that the north–south slope in Martian topography causes asymmetries in the Hadley cells at equinox and in the annual average. To quantitatively solve for the latitude of the dividing streamline and poleward boundaries of the cells, the Hadley cell model of Lindzen and Hou was modified to include topography. The model was thermally forced by Newtonian relaxation to an equilibrium temperature profile calculated with daily averaged solar forcing at constant season. Two sets of equilibrium temperatures were considered that either contained the effects of convection or did not. When convective effects were allowed, the presence of the slope component shifted the dividing streamline upslope, qualitatively similar to a change in season in Lindzen and Hou’s original (flat) model. The modified model also confirmed that the geometrical effects of the slope are much smaller than the thermal effects of the slope on the radiative–convective equilibrium temperature aloft. The results are compared to a simple MGCM forced by Newtonian relaxation to the same equilibrium temperature profiles, and the two models agree except at the winter pole near solstice. The simple MGCM results for radiative–convective forcing also show an asymmetry between the strengths of the Hadley cells at the northern summer and northern winter solstices. The Hadley cell weakens with increasing slope steepness at northern summer solstice but has little effect on the strength at northern winter solstice. |
| first_indexed | 2024-09-23T10:52:50Z |
| format | Article |
| id | mit-1721.1/60347 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:52:50Z |
| publishDate | 2010 |
| publisher | American Meteorological Society |
| record_format | dspace |
| spelling | mit-1721.1/603472022-09-27T15:38:43Z An Analysis of the Effect of Topography on the Martian Hadley Cells Plumb, R. Alan Zalucha, Angela Marie Wilson, R. John Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Plumb, R. Alan Plumb, R. Alan Zalucha, Angela Marie Previous work with Mars general circulation models (MGCMs) has shown that the north–south slope in Martian topography causes asymmetries in the Hadley cells at equinox and in the annual average. To quantitatively solve for the latitude of the dividing streamline and poleward boundaries of the cells, the Hadley cell model of Lindzen and Hou was modified to include topography. The model was thermally forced by Newtonian relaxation to an equilibrium temperature profile calculated with daily averaged solar forcing at constant season. Two sets of equilibrium temperatures were considered that either contained the effects of convection or did not. When convective effects were allowed, the presence of the slope component shifted the dividing streamline upslope, qualitatively similar to a change in season in Lindzen and Hou’s original (flat) model. The modified model also confirmed that the geometrical effects of the slope are much smaller than the thermal effects of the slope on the radiative–convective equilibrium temperature aloft. The results are compared to a simple MGCM forced by Newtonian relaxation to the same equilibrium temperature profiles, and the two models agree except at the winter pole near solstice. The simple MGCM results for radiative–convective forcing also show an asymmetry between the strengths of the Hadley cells at the northern summer and northern winter solstices. The Hadley cell weakens with increasing slope steepness at northern summer solstice but has little effect on the strength at northern winter solstice. National Science Foundation (U.S.) (Grant ATM-0436288) United States. National Aeronautics and Space Administration (Grant NNG05GB65G) 2010-12-21T21:08:09Z 2010-12-21T21:08:09Z 2010-03 2009-03 Article http://purl.org/eprint/type/JournalArticle 0022-4928 1520-0469 http://hdl.handle.net/1721.1/60347 Zalucha, Angela M, R. Alan Plumb, and R. John Wilson. “An Analysis of the Effect of Topography on the Martian Hadley Cells.” Journal of the Atmospheric Sciences 67.3 (2010): 673-693. © 2010 American Meteorological Society https://orcid.org/0000-0002-6716-1576 en_US http://dx.doi.org/10.1175/2009jas3130.1 Journal of the Atmospheric Sciences Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Meteorological Society American Meteorological Society |
| spellingShingle | Plumb, R. Alan Zalucha, Angela Marie Wilson, R. John An Analysis of the Effect of Topography on the Martian Hadley Cells |
| title | An Analysis of the Effect of Topography on the Martian Hadley Cells |
| title_full | An Analysis of the Effect of Topography on the Martian Hadley Cells |
| title_fullStr | An Analysis of the Effect of Topography on the Martian Hadley Cells |
| title_full_unstemmed | An Analysis of the Effect of Topography on the Martian Hadley Cells |
| title_short | An Analysis of the Effect of Topography on the Martian Hadley Cells |
| title_sort | analysis of the effect of topography on the martian hadley cells |
| url | http://hdl.handle.net/1721.1/60347 https://orcid.org/0000-0002-6716-1576 |
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