This time Dev will present his work in the Green-blue project. We will meet at the meeting room 2418 in the Kristine Bonnevies hus building. It is also possible to follow his talk on Zoom. This link will be sent via email to CBA members.
A short description about Dev's research :
DOC lateral transport from inland waters to oceans is of particular relevance to Norway with its long coast and its economic reliance on the marine ecosystem. To better understand the link between DOC and its effect on the phytoplankton bloom and fish spawning time, we develop a module within the Community Terrestrial System Model (abbreviated as CTSM, a land surface component of the Norwegian Earth System Model) to include DOC production in the soil, consumption, the riverine transport of DOC, and DOC leaching. CTSM is a useful tool to construct the historical DOC changes and project future DOC changes from local to regional and regional to global scales.
DOC production is modeled as flux from the decomposition of litter and soil organic matter within the soil carbon module of CTSM. In particular, DOC flux is produced in addition to respiration fluxes along the way when decomposition of litter and soil organic matter happens. Then produced DOC is exported to the river routing component. The following schematic figure shows a brief overview of modeling lateral riverine DOC transport in different hydrologic units after DOC production. DOC routed as overland flow from hillslope into the sub-network channel. Sub-network receives riverine DOC from the hillslope, routes riverine DOC through the channel, and discharges it into the main channel. The main channel receives riverine DOC from the sub-network channel and/or inflow, if any, from the upstream spatial units and discharges water to its downstream spatial units or to the ocean. River routing in CTSM assumes that all the tributaries within a spatial unit can be treated as a single hypothetical sub-network as shown in the schematic.
I will present more details on the steps of DOC modeling and show preliminary results of DOC production from the soil carbon module of CTSM.