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      Transient reducing greenhouse warming on early Mars : REDUCING GREENHOUSES ON EARLY MARS

      , , , , , , ,
      Geophysical Research Letters
      Wiley-Blackwell

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          The HITRAN2012 molecular spectroscopic database

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            Simplified CCSD(T)-F12 methods: theory and benchmarks.

            The simple and efficient CCSD(T)-F12x approximations (x = a,b) we proposed in a recent communication [T. B. Adler, G. Knizia, and H.-J. Werner, J. Chem. Phys. 127, 221106 (2007)] are explained in more detail and extended to open-shell systems. Extensive benchmark calculations are presented, which demonstrate great improvements in basis set convergence for a wide variety of applications. These include reaction energies of both open- and closed-shell reactions, atomization energies, electron affinities, ionization potentials, equilibrium geometries, and harmonic vibrational frequencies. For all these quantities, results better than the AV5Z quality are obtained already with AVTZ basis sets, and usually AVDZ treatments reach at least the conventional AVQZ quality. For larger molecules, the additional cost for these improvements is only a few percent of the time for a standard CCSD(T) calculation. For the first time ever, total reaction energies with chemical accuracy are obtained using valence-double-zeta basis sets.
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              Deposition, exhumation, and paleoclimate of an ancient lake deposit, Gale crater, Mars

              The landforms of northern Gale crater on Mars expose thick sequences of sedimentary rocks. Based on images obtained by the Curiosity rover, we interpret these outcrops as evidence for past fluvial, deltaic, and lacustrine environments. Degradation of the crater wall and rim probably supplied these sediments, which advanced inward from the wall, infilling both the crater and an internal lake basin to a thickness of at least 75 meters. This intracrater lake system probably existed intermittently for thousands to millions of years, implying a relatively wet climate that supplied moisture to the crater rim and transported sediment via streams into the lake basin. The deposits in Gale crater were then exhumed, probably by wind-driven erosion, creating Aeolis Mons (Mount Sharp).
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                Author and article information

                Journal
                Geophysical Research Letters
                Geophys. Res. Lett.
                Wiley-Blackwell
                00948276
                January 28 2017
                January 28 2017
                : 44
                : 2
                : 665-671
                Article
                10.1002/2016GL071766
                ddaa963c-193b-4aff-a63b-1886278a1bb3
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1

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