B017
Biogeochemistry of colloidal particles in the critical zone

Session ID#: 158830

Session Description:
Critical Zone scientists are seeking to gauge the rates at which soils are formed and destroyed, and to understand the processes governing these rates. This can be achieved at the pedon scale using mineralogical and geochemical tools and at the catchment scale using measurements of solute fluxes. However, they rely on the premise that elemental depletion in soils result only from export of stream and "dissolved matter" consists only of truly dissolved solutes. These assumptions now appear problematic because: there is growing evidence that the selective export of colloidal matter, e.g. through downward percolation through soil pores to groundwater, is a major agent of chemical depletion in soils and in streams.

This session is to address the understanding of the bio-physical-chemical mechanisms controlling the mobility/accumulation, transformation of sub-µm particles in the critical zone. We encourage submissions examining all aspects of the biogeochemical fate of those particles (alone or as a multi component matrix). We are interested in lab - and pilot- scale experiments as well as field characterisation/trials

Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
1039 Alteration and weathering processes [GEOCHEMISTRY]
1625 Geomorphology and weathering [GLOBAL CHANGE]
1886 Weathering [HYDROLOGY]

Primary Convener:  Marc F. Benedetti, Institut de Physique du Globe de Paris, Paris, France
Convener:  Jon Chorover, University of Arizona, Environmental Science, Tucson, United States
 
Physico-Chemical Composition of Surface Waters from a Mining District (Orbiel Valley, France): Crucial Role of Colloidal Matter as Metal Transfer Vector (1065325)
Marie Heydon1, Jerome Viers2, Eva Schreck2, Lucia Perez Serrano3, Oleg Pokrovsky4 and Philippe Behra5, (1)Toulouse, Occitanie, FRANCE, (2)GET Géosciences Environnement Toulouse, Toulouse, France, (3)Université Toulouse III - Paul Sabatier, Toulouse, France, (4)National Research Tomsk State University, Tomsk, Russia, (5)Laboratoire de Chimie Agro-industrielle, LCA, Toulouse, France
 
Considering colloids will change the way you think about elemental fluxes in the critical zone (Invited) (1088624)
Aaron Thompson, University of Georgia, Crop and Soil Sciences, Athens, United States
 
Colloid Formation and its Contribution to Landscape Chemical Denudation During Weathering of Tephritic Model Hillslopes (1105894)
Jon Chorover1, Charlie Cunningham2, Yadi Wang2, Peter A A Troch3 and Robert Root4, (1)University of Arizona, Tucson, AZ, United States, (2)University of Arizona, Environmental Science, Tucson, United States, (3)University of Arizona, Hydrology and Atmospheric Sciences, Tucson, AZ, United States, (4)University of Arizona, Environmental Science, Tucson, AZ, United States
 
Soil Particle Size Distribution (PSD) as a Predictor Variable for Microbial Species Distribution (1167398)
Alexander Ederer1, Rachel E Gallery2, Marley Watkins3, Emma L Aronson4 and Jon Chorover3, (1)University of Arizona, Tucson, United States, (2)University of Arizona, School of Natural Resources and the Environment, Tucson, United States, (3)University of Arizona, Environmental Science, Tucson, United States, (4)University of California Riverside, Riverside, CA, United States
 
Nanophases and volcanoes (1168535)
Marc F. Benedetti, Michael Tharaud and Marine Gelin, Institut de Physique du Globe de Paris, Paris, France
 
On Small Colloids and Their Role in the Critical Zone (1177132)
Erwin Klumpp, Forschungszentrum Jülich GmbH, Jülich 52428, Germany
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