HR: 1340h
AN: B43A-0125    [Abstracts]
TI: Controls on stream DOC flux and composition in the Amazon region, Tapajos national forest
AU: * Kramer, M G
EM: kramerm@fsl.orst.edu
AF: UC Santa Cruz Earth Science Department, 1156 High Street, Santa Cruz, Ca 95064
AU: De Oliveira, R C
EM: cosme@cpatu.embrapa.br
AF: EMBRAPA-BEELM, Belem Brasil, Belem, 66620
AU: Potter, C
EM: cpotter@mail.arc.nasa.gov
AF: NASA Ames, Mail Stop 242-4, Moffett Feild, Ca 94035 Brazil
AU: Klooster, S
EM: sklooster@mail.arc.nasa.gov
AF: CSUMB Monterey, 100 Campus Center, Seaside, Ca 93955
AB: To improve predictive capabilities of water, carbon and nitrogen gas fluxes in the Amazon region, we are examining the influence of land cover, topography and soil on stream dissolved organic carbon (DOC) flux and composition. Using 90-m SRTM digtal elevation (DEM) data and land cover/land use maps derived from Landsat-TM we have selected several catchments in the Tapajos national forest drainage area with contrasting land use, topography, and soils. Field sampling of throughfall, lysimeter and stream water components will provide insight into flow path dynamics and a better understanding of the chemical nature of DOC under contrasting land use patterns. DOC samples will be characterized and compared using Nuclear Magnetic Resonance (NMR). In addition to parameterizing model simulations of carbon and nitrogen dynamics, monitoring of DOC flux across select streams will be used for model validation.
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting