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Dear colleagues, Simon Mudd, Manny Gabet, Kitty Lohse and I are co-chairing a session at Fall 2007 AGU that may be of interest to you (see description below). Please consider submitting an abstract by the Sept. 6th deadline. H56:Controls on Geochemical and Biogeochemical Processes in the Critical Zone. There has recently been a growing interest in understanding the controls on geochemical and biogeochemical processes within the critical zone at various spatial scales. At the scale of individual hillslopes and soil pedons, spatial and temporal variations in hydrologic conditions (e.g. soil moisture, fluid velocity and solute transport) can greatly control critical zone biogeochemical reactions and cycling. At the watershed scale, the role of factors such as the supply of fresh minerals by erosion and the role of landscape characteristics (e.g., topography) in modulating the contact time between water and minerals is thought to provide a first-order control on geochemical processes, particularly chemical weathering. We invite papers that: (1) investigate how geomorphic processes and landscape attributes may influence the rates and spatial distribution of chemical weathering in the critical zone, (2) examine fundamental ways in which hydrologic and biogeochemical cycles interact across various spatial and temporal scales, and (3) present novel techniques for measuring and/or modeling these various processes. Regards, Jennifer ------------------------------------ Jennifer McIntosh, Ph.D. Assistant Professor Dept. of Hydrology & Water Resources University of Arizona Tucson, AZ 85721 (520)626-2282 office (520)621-1422 fax www.hwr.arizona.edu/mcintosh/ ---