HR: 10:20h
AN: B42A-01    [Abstracts]
TI: Mesoscale Drivers of Major Tributary Chemistry: a Quasi-Inverse Modeling Approach
AU: * Richey, J
EM: jrichey@u.washington.edu
AF: School of Oceanography, Univ. of Washington, Seattle, WA 98195 United States
AU: Victoria, D
EM: dvictori@cena.usp.br
AF: Centro de Energia Nuclear na Agricultura, CP 96, Piracicaba, SP 13400 Brazil
AU: Santiago, A
EM: santiago@esalq.usp.br
AF: Centro de Energia Nuclear na Agricultura, CP 96, Piracicaba, SP 13400 Brazil
AU: Ballester, V
EM: vicky@cena.usp.br
AF: Centro de Energia Nuclear na Agricultura, CP 96, Piracicaba, SP 13400 Brazil
AU: cabral, M
EM: cabral@hydro.washington.edu
AF: Dept. of Civil & Environ. Engineering, Univ. of Washinton, Seattle, WA 98195 United States
AB: The biogeochemical signal (the composite hydrological and chemical distributions of C, N, O, and P species) at the downstream end of a major tributary can nominally be used to identify different drainage basin source regions, reaches or stages, and can be tied to landscape-related processes such as chemical weathering and nutrient retention by local vegetation. Indeed, the central premise of a large river basin model is that the constituents of river water provide a continuous, integrated record of upstream processes. But because of potential scaling issues and alternative pathways, the problem is not that "simple." Here we examine the composite chemical signals in the lower reaches of the Madeira, Purus, Juru , Ic , Japur , and Negro rivers in terms of their respective upstream hydrological cycles and basin properties. Essentially, we use an inverse model to see how far we can explain the observed signals.
DE: 1836 Hydrologic budget (1655)
DE: 1650 Solar variability
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting