The Miocene period saw substantially warmer Earth surface temperatures than today, particularly during a of global warming called the Mid Climatic Optimum (MMCO; ∼17–15 Ma). However, long-term drivers climate remain poorly understood. By using new continuous climate-biogeochemical model (SCION), we can investigate interaction between volcanism, and biogeochemical cycles through Miocene. We iden...

The origin of the martian gullies has been much debated since their discovery by the Mars Orbiter Camera (MOC, Malin, M.C., Edgett, K.S. [2000]. Science 288, 2330–2335). Several previous studies have looked at slope gradients in and around gullies, but none have used Digital Elevation Models (DEMs) from the High Resolution Imaging Science Experiment (HiRISE, McEwen, A.S., and 14 colleagues [200...

a Observatoire Midi-Pyrénées, Laboratoire Dynamique Terrestre et Planétaire, UMR 5562, Université Paul Sabatier, Toulouse, France b Laboratoire de Planétologie et Géodynamique, Nantes University, UMR CNRS 6612, Nantes, France c School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ, USA d Institut de Physique du Globe de Paris Equipe Géophysique Spatiale et Plané...

I To get us under way, consider a now familiar image: the manager who has his/her secretary print out his/her e-mails and stack them high for subsequent perusal. Not quite apocryphal enough, this practice – the source of many cartoons and much “back stage” grumbling – expresses a not-so-subtle judgement about information technology. We suppose that it breaks roughly into two distinct elements. ...

The objectives of this project for FY98 have been to 1) participate in the analysis and interpretation of the bottom boundary layer field studies; 2) test and apply a 2-dimensional, time-dependent model of shelf sediment transport to investigate the importance of advection and flux divergence to event bed formation and the emplacement of flood deposits; and 3) incorporate flocculation effects i...