Jo Uhlbaeck
PhD Student


Research interests

Project title: Particulate organic carbon dynamics along the LOAC

Supervisor: Professor Tim Quine, Professor Pierre Friedlingstein

Funding: C-CASCADES, Horizon 2020

Project description
Soils comprise the major reservoir of carbon on land, and one of the current challenges in assessing the global carbon budget is to interpret the magnitude of human impact on the lateral carbon export from land to ocean. The anthropogenic vs. natural input and transport of particulate organic carbon (POC) into and along stream systems from land to ocean is not yet well described (Regnier et al, 2013). Accelerated soil erosion due to changes in land use (e.g. increased agriculture), together with artificial catchments due to damming of river systems (e.g. hydropower), impact the volumes, transport and fate of suspended organic material. While mainly geomorphic processes control erosion and deposition of inorganic sediments, the mobility and transformation of POC is further subject to mineralisation and stabilisation processes, sequestration by burial into sediments, and microbial fermentation which contribute to the vertical emission of carbon species like CO2 and CH4 that are potent greenhouse gases. These sources, sinks and transformations of POC along the land-ocean aquatic continuum (LOAC) are dynamic and depend on input, transport and deposition of suspended organic materials. The objectives of this project are to quantify POC erosion, sedimentation and transformation rates along the LOAC, by database analyses, measurements of POC transfer, and model development.

This project is based at University of Exeter, will have a secondment at Uppsala University, and is part of C-CASCADES, which has received funding from the European Union’s Horizon 2020 research and innovation programme.

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