HR: 1340h
AN: B23B-1273    [Abstracts]
TI: Upscaling Weathering With an Earth System Model of Intermediate Complexity
AU: * Arens, S
EM: sarens@bgc-jena.mpg.de
AF: Max-Planck-Institute for Biogeochemistry, Hans-Knöll-Str. 10, Jena, 07745, Germany
AU: Kleidon, A
EM: akleidon@bgc-jena.mpg.de
AF: Max-Planck-Institute for Biogeochemistry, Hans-Knöll-Str. 10, Jena, 07745, Germany
AB: How can we model weathering on a global scale without using parametric laws? On local scales, weathering can be modeled based on information on soil profiles, lithologies and vegetation types. On regional scales, catchment area characteristics need to be specified since topography and lithologies along the river play a key role in the final cation and alkalinity fluxes of rivers into oceans. On the global scale ocean biogeochemistry and the fractionation between pelagic and demersal waters has changed during Earth history, adding a whole other set of challenges to deep paleo carbon cycle modeling. We propose a set of simple but mechanistically inspired parameterizations for modeling the variability of weathering with a spatially explicit Earth System Model of Intermediate Complexity (EMIC). With a focus on the biospheric influence on local scales and carbonate/silicate lithologies as controls on river chemistry on regional scales, we sum up weathering input to oceans on the global scale. Finally, we test the sensitivity of our model to climate variability and anthropogenic land use change.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
DE: 0466 Modeling
DE: 0473 Paleoclimatology and paleoceanography (3344, 4900)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting