As the fall AGU abstract deadline looms on September 6, please consider the following session: V17: Weathering Processes Across Natural Landscape Gradients: New Isotopic and Geochemical Approaches Invited speakers: Bernard Bourdon, ETH Zurich Oliver Chadwick, University of California, Santa Barbara James Kirchner, University of California, Berkeley Jason Neff, University of Colorado, Boulder Conveners: Kate Maher US Geological Survey 345 Middlefield Rd MS 73 Menlo Park, CA, USA 94301 (650)329-4978 [log in to unmask] Stephanie Ewing U.C. Berkeley, Center for Isotope Geochemistry Department of Earth & Planetary Science 301 McCone Hall Berkeley, CA, USA 94704 (510)643-5063 [log in to unmask] Description: Natural environmental gradients can provide critical insights regarding physical and chemical weathering processes. These processes are often revealed by examining isotopic and geochemical trends at related sites that vary in climate, landform age, erosion rates, atmospheric deposition, or hydrologic regime (e.g. permafrost thaw or clay accumulation). We invite contributions that focus on new categories of environmental gradients, and contributions that highlight new isotopic approaches (stable, cosmogenic or radiogenic) to advance our understanding of the physical, geochemical and biogeochemical evolution of landscapes across different types of natural gradients. Sponsor: Volcanology, Geochemistry, and Petrology CoSponsor: Biogeosciences http://www.agu.org/meetings/fm07/?content=search&show=detail&sessid=263