For the Goldschmidt meeting on Aug. 12-17, 2018, please considering submitting an abstract to our session, 11i: Soil Gas Dynamics through Space and Time: Linkages with Weathering Rates and Global Biogeochemical Cycles. Please also pass this along to colleagues or advisees who may be interested. Abstracts are due Mar. 30, 2018.
Conveners: Liz Hasenmueller, Gary Stinchcomb, and Julie Weitzman
Theme: Weathering, Erosion, and Geochemical Cycles
Session Description: Soil gas plays a key role in weathering processes, the global C and N cycles, and controlling the composition of porefluids. Over geologic time, the dissolution of soil CO2 and O2 into soil porewater or shallow groundwater has provided major sources of acidity and oxidants for rock weathering. Thus, accurate measurements of soil CO2 and O2 concentrations are essential for determining bedrock weathering rates, their role in the global C cycle, and the impact of soils under a changing climate. Over much shorter timescales, soil processes like nitrification and denitrification are largely driven by soil gas O2 dynamics within the soil profile, impacting the release of climate-altering greenhouse gases like NO and N2O from the soil surface. This session will highlight presentations about the role of soil gas composition in 1) the weathering of soils and rocks and 2) biogeochemical cycling spanning multiple scales in space and time. The session also welcomes papers that explore soil gas dynamics through geologic time using paleosol archives.
Dr. Elizabeth Hasenmueller
Department of Earth & Atmospheric Sciences
Saint Louis University