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AGU journal highlights -- Dec. 31, 2008
Date:1/2/2009

. On the basis of similarities in shape of ring mold craters to laboratory impact craters in ice and of the physics of impact cratering into pure ice, the authors interpret ring mold craters to result from projectiles hitting relatively pure ice below a thin debris layer. These results support the hypothesis that lobate debris aprons and lineated valley fill are debris-covered glaciers and that many hundreds of meters of ice remain in these deposits today on Mars.

Title: Ring-mold craters in lineated valley fill and lobate debris aprons on Mars: Evidence for subsurface glacial ice

Authors: Ailish M. Kress and James W. Head: Department of Geological Sciences, Brown University Providence Rhode Island, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL035501, 2008, 2008; http://dx.doi.org/10.1029/2008GL035501


5. Explaining the scope of Earth's tropical air flows

The Hadley cells form the planetary overturning circulation in the tropical atmosphere. In a Hadley cell, air rises from near the equator at the surface to the upper troposphere, moves poleward until about 30 degrees in latitude, then descends into the subtropics before moving equatorward along the Earth's surface. Recent observations and simulations with climate models suggest that the north-south extent of the Hadley cells may be increasing, which may dramatically alter climate on regional scales. Korty and Schneider analyze dynamical mechanisms responsible for terminating the Hadley cells in the subtropics. They suggest that Hadley cells terminate where eddies generated in the extratropics become so deep that they reach the upper troposphere. At the latitude where this occurs, the direction of the momentum flux carried by the eddies changes sign; the tropical Hadley cells give way to the extratropical Ferrel cells. The authors show how the atmospheric ther
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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