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GSA's top geoscience journal posts 9 new articles
Date:5/2/2013

dual changes in the seasonality of solar radiation (i.e., insolation), ultimately they were driven and amplified by strong positive feedbacks within the climate system, including changes in atmospheric CO2 in particular. In this study, L.C. Skinner and colleagues show that this deglacial pulse in ocean ventilation was not driven by the North Atlantic overturning alone, and must have involved an increase in the ventilation of southern-sourced deep waters. Their results thus confirm the removal of a physical and/or dynamical barrier to effective air-sea (CO2) exchange in the Southern Ocean during deglaciation and highlight the Antarctic region as a key locus for global climate/carbon-cycle feedbacks.


Fill and spill of giant lakes in the eastern Valles Marineris region of Mars
Nicholas H. Warner et al., Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA. Posted online ahead of print on 29 April 2013; http://dx.doi.org/10.1130/G34172.1.

The occurrence of Hesperian age (3.7𔃁.4 billion years old) standing bodies of water at the surface of Mars is a contentious issue, often conflicting with favored climate models. Extensive lakes are proposed to have filled parts of Valles Marineris during this period, yet evidence for their presence and temporal continuity is poorly constrained. In this study, Nicholas Warner and colleagues test the lake hypothesis within eastern Valles Marineris using a new suite of high-resolution imagery and topography data. They analyze the complex geomorphologic and chronologic relationships between structurally controlled, chaotic terrain basins and their associated catastrophic outflow channels. The study results demonstrate that the outflow channels and interbasin chasmata exhibit evidence for significant bedrock erosion by catastrophic spillover from preexisting, kilometer-deep bodies o
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8

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