Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p52a0366l&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P52A-0366
Other
0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 3319 General Circulation, 3344 Paleoclimatology, 5445 Meteorology (3346), 6225 Mars
Scientific paper
The circulation of the Martian atmosphere may be substantially affected by changes in orbital parameters. Such changes will undoubtedly alter the seasonal distribution of incident solar radiation on time scales greater than 105 years, and hence the forcing of the atmospheric circulation. For this investigation, we focus on the response of the general circulation to changes in obliquity, eccentricity, and argument of perihelion. We use the Geophysical Fluid Dynamics Laboratory (GFDL) Mars General Circulation Model (GCM) to examine changes in the nature of the Hadley circulation, polar jets, and eddies as orbital elements are varied. A number of basic findings emerge from the simulations. For example, the Hadley cell exhibits strongly non-continuous variation with obliquity. As obliquity is increased from 0o, the northern summer circulation retains an equinoctial-like dual cell pattern until obliquity exceeds 10o. Only after that does the dominant cross-equatorial cell pattern emerge. Conversely, the southern hemisphere summer cell develops a strong cross-equatorial pattern at obliquities below 5o. This starkly asymmetric Hadley cell behaviour results from the global mean topographic slope. The simulations also highlight other ways in which topography places a control on the extent and strength of the Martian Hadley circulations. The polar jet is also affected by changes in obliquity. For obliquities above 45o, we find that the expanded and strengthened descending branch of the Hadley cell adiabatically warms the polar regions, reducing the latitudinal temperature gradient and decreasing the strength of the corresponding polar jet.
Liu Jinjie
Richardson Mark I.
Wilson Richard J.
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