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Geosphere adds 2 new special issue themes
Date:4/1/2013

vents are correlated with previously documented marine carbon isotope events in Europe. Our correlations documented the marked carbon isotope variations occurred near simultaneously in the ocean-atmosphere-biosphere system in the Turonian. In addition, global correlation of Turonian marine and terrestrial carbon isotope events identifies changes in the isotopic difference between terrestrial and marine carbon isotope data, and are interpreted to reflect changes in atmospheric pCO2 levels, and climate driven stresses of humidity and soil processes. In earlier stages of Turonian, the isotopic differences are increased. Elevated atmospheric pCO2, and increased humidity and soil processes in enhanced greenhouse conditions during mid-Turonian are interpreted to enlarge the isotopic differences. In later stages of Turonian, the isotopic difference is constant level, and the lowering of atmospheric pCO2 or decrease of climate stress which related to the diverse paleoclimatic cooling is interpreted to have restored the ocean-atmosphere carbon isotope trends.


Quantifying the effects of terrestrial laser scanner (TLS) settings and survey configuration on land surface roughness measurement
Owen W. Brown, Department of Geography, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada; and Chris H. Hugenholtz, Department of Geography, University of Calgary, Calgary, Alberta T2N 1N4, Canada. Issue: April 2013. Originally posted online 18 March 2013; http://dx.doi.org/10.1130/GES00809.1.

The application of terrestrial laser scanning (TLS) for measuring Earth surface features is increasing. However, TLS surveys require users to choose and specify certain properties of the scan (i.e., resolution, height, distance, number of scan positions), often with limited understanding of how these properties affect the accuracy of the data. Owen W. Brown and Chris H. Hugenholtz present
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Contact: Kea Giles
kgiles@coyotesong.com
Geological Society of America
Source:Eurekalert

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