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INSTAAR seminar: Miguel Goñi - Mobilization & export of particulate and dissolved organic carbon...

Monday, January 24, 2022, 12:00PM - 1:00PM

Speaker

Miguel Goñi

Full title

Mobilization and export of particulate and dissolved organic carbon in contrasting small mountainous river watersheds in California and Oregon

 

Dr. Goñi’s seminar will be held Remotely.

 

Zoom link: https://cuboulder.zoom.us/s/94699942840
Password: noon2021

 

Mobilization and Export of Particulate and Dissolved Solids and Organic Carbon from Contrasting Small Mountainous River Watersheds in California and Oregon

 

The magnitude, composition and timing of dissolved and particulate fluxes by rivers are important components of the biogeochemical cycles of many elements (e.g., carbon, nitrogen, silica, trace metals) along the land-ocean continuum, from soils and streams to estuaries and the coastal ocean. In this study, we evaluate the concentration vs discharge relationships of total suspended solids (TSS), total dissolved solids (TDS), particulate organic carbon (POC) and dissolved organic carbon (DOC) in the tributaries and main-stems of two small mountainous river systems in northern California and central Oregon (Eel and Umpqua River systems, respectively). The Eel and Umpqua watersheds share some important characteristics, including comparable climate, vegetation, watershed size and mean annual discharge. However, the two systems also differ greatly in the type of underlying bedrock, soil thickness and tectonic setting, with the Eel system displaying thinner soils, higher uplift and erosion rates, and much more friable bedrock than the Umpqua system. We focus on the distinct concentration-discharge relationships for different constituents among the different streams and investigate compositional differences in the context of hydrological and watershed characteristics. Furthermore, using the discharge-concentrations relationships, we investigate the timing and magnitude of export fluxes of TSS, TDS, POC and DOC, including their relationship to seasonal ocean conditions offshore (e.g., waves and wind). These findings provide insights into how seasonal and inter-annual differences in the fluvial discharge patters and compositions may affect the fate of land-derived materials entering the coastal regions.

Audience

Free and open to the public. Contact instaar@colorado.edu for the Zoom link and password.