Towards a Model of Carbon Mobilization, Advection, and Reaction in the Amazon River
Jeffrey
E.
Richey, University of Washington, jrichey@u.washington.edu
(Presenting)
Anthony
A
Aufdenkampe, Stroud Water Research Center, aufdenkampe@stroudcenter.org
Alex
K
Krusche, Centro de Energia Nuclear na Agricultura, alex@cena.usp.br
Daniel
Victoria, Centro de Energia Nuclear na Agricultura, dvictori@cena.usp.br
Maria
Ballester, Centro de Energia Nuclear na Agricultura, vicky@cena.usp.br
Large rivers receive and transform inputs from heterogeneous landscapes, resulting in highly aggregated and complex signals in the composition of the dissolved organic matter in transport We hypothesize that these signals can be decomposed into their constituent dynamics by representing bulk carbon as a sum of carbon fractions divided by molecular weight (to account for the observed increase in degradation state as the molecular size decreases, and to facilitate the parameterization of organo-mineral associations), mobilized by hydrologic flow paths. We are exploring this hypothesis for the Amazon River system within the construct of a “River Basin Organic Matter and Biogeochemistry Synthesis” (ROMBUS) model. Within ROMBUS each of the organic and inorganic carbon pools are represented by state variables that characterize the nitrogen-to-carbon ratio (for the OM pools), δ13C signature and age (via Δ14C). The model is implemented as pixels within a geospatial model of the landscape, and flow paths are computed via a hydrology model.
Submetido por Jeffrey E. Richey em 23-MAR-2004
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)