Greenhouse gas emissions from Batang Ai, a tropical reservoir

Greenhouse gas footprint


Reservoirs are significant sources of greenhouse gases (GHG), but their contribution to global C emissions remains uncertain. Part of this uncertainty is due to limited empirical data on the mechanisms underlying reservoir C fluxes and their variability at a local scale. This lack of information is especially apparent in tropical regions, where reservoir C emissions tend to be the highest. This project focuses on understanding CO2 and CH4 dynamics in Batang Ai (Malaysia), a tropical reservoir. The first objective is to assess the different C emission pathways (diffusion, ebullition, and downstream emissions) and how they vary in space and time to shape the C footprint of the reservoir. The second objective is to study how metabolic C processes, underlying CO2 and CH4 fluxes, vary in the water column and sediments along the river to reservoir gradient. The final objective is to quantify the vertical transport of C gases in order to understand the role of physical processes in sustaining surface fluxes.

Microbial community associated to carbon dynamic


The construction of human made reservoirs includes flooding of a large area of the terrestrial landscape, deeply altering the natural carbon dynamics of the watershed. Amongst the processes affected, some of major concern are GHG production, consumption, and emissions. While our current knowledge about these is mostly from assessments in temperate and boreal biomes, reservoir constructions are growing fast in the tropics. Therefore, we are interested in exploring how the presence of a reservoir influences the dynamics of carbon, particularly CO2 and CH4, and the associated microbial communities in the tropical reservoir Batang Ai (Malaysia).