AGU journal highlights -- July 23, 2008(ring layers typically overlying iron-ric...)

Date:7/24/2008

ring layers typically overlying iron-rich clay deposits. This, combined with high-resolution topographic data, suggests that the aluminum-rich clay-bearing layers are younger than the outflow channel and may represent a later sedimentary or altered volcanic ash deposit that drapes the topography. Because of Mawrth Vallis's distinct layering history, the authors expect that this would make a good location for future surface missions to Mars to study geologic history and ancient habitable environments on Mars.

Title: Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars

Authors: J. J. Wray and S. W Squyres: Department of Astronomy, Cornell University, Ithaca, New York, U.S.A.;

B. L. Ehlmann and J. F. Mustard: Department of Geological Sciences, Brown University, Providence, Rhode Island, U.S.A.;

R. L. Kirk: Astrogeology Program, U.S. Geological Survey, Flagstaff, Arizona, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL034385, 2008; http://dx.doi.org/10.1029/2008GL034385

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5. Uruguay River flow responds to climate, land-use changes

The Uruguay River basin has experienced extensive land change during the second half of the twentieth century as agricultural area expanded. Concurrent with this has been an increase of streamflow and precipitation due to atmospheric dynamics. To help determine which factorland use change or atmospheric dynamicshas contributed more to fluctuations in Uruguay River discharge, Saurral et al. study streamflow along the Uruguay River using a hydrology model run between 1960 and 2000 that explicitly accounts for the role of land cover. The authors find that increases in average streamflow are more likely attributable to climatic variations, implying that land use changes were not large enough to produce appreciable changes in basin runoff. This is perhaps
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Contact: Peter Weiss pweiss@agu.org 202-777-7507 American Geophysical Union Source:Eurekalert

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