Three-Dimensional Climate Modeling of the Amazonian Environment and Glaciation

Details Three-Dimensional Climate Modeling of the Amazonian Environment and Glaciation Three-Dimensional Climate Modeling of the Amazonian Environment and Glaciation

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p34a..07r&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P34A-07

Physics

4946 Milankovitch Theory, 5405 Atmospheres (0343, 1060), 5416 Glaciation, 5462 Polar Regions, 6225 Mars

Scientific paper

Spacecraft data increasingly suggest that Mars has experienced dramatic changes in the distribution of surface and subsurface water ice in the recent past, potentially associated with rather different climate states. In the limit of high obliquity, this likely corresponds to tropical water ice sheets, while in the low obliquity limit, it corresponds to atmospheric collapse. Climate models suggest that such changes in the planetary environment and water distribution are expected on the basis of the large change in planetary orbital parameters on time scales >10{5} yrs. These variations are quazi-cyclical, and so are expected to have caused ongoing (non-secular) changes in climate throughout the Amazonian. Indeed, some orbital forcing of climate may be involved in the episodes of raised and lowered water table in Terra Meridiani, as inferred from Opportunity observations. It is believed that superposed on this quazi-cyclical pattern is a signal of net atmospheric deflation, due primarily to loss to space. The challenge for climate dynamics is to explain the nature and extent of climate change through time, with a particular focus on the changing distribution and stability of water. This presentation will review developments to date, model sensitivities, and future directions.

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