Raft launched in Amstelveense Poel
End of May 2016, AWS postdoc Joanda Verspagen, AWS postdoc Arie Vonk and Dr Ko van Huissteden launched a raft to measure carbon dioxide (CO2) fluxes from the Amstelveense Poel.
In nutrient-rich shallow peat lakes, large amounts of carbon are mineralized, which are released to the atmosphere as carbon dioxide (CO2) and methane (CH4). During summer however, these lakes harbor algal blooms that need CO2 for photosynthesis and growth. Dense blooms can quickly consume most of the dissolved CO2, which is replenished from the atmosphere, creating a CO2 flux from the atmosphere into the water.
Concentrations of the greenhouse gases CO2 and methane have increased dramatically since the industrial revolution. Rising atmospheric CO2 concentrations are expected to intensify algal blooms, particularly in nutrient-rich lakes. However, very little is known about the factors that influence the CO2 flux (and the methane flux) between the atmosphere and the water in dense blooms
To study the CO2 and methane fluxes, earth scientists from the Vrije Universiteit and biologists from the University of Amsterdam have launched a raft with measuring equipment in the Amstelveense Poel.
The raft is equipped with an eddy covariance system that measures the flux of CO2 between the water and the atmosphere, and with multi-sensor probes that measure CO2 and oxygen concentrations, pH, etc., in the water. At the same time, an intense monitoring program is carried out to study the dynamics of the algal bloom and the fluxes of CO2 and methane from the sediment into the water. Together, these measurements will give more insight into the role of nutrient-rich lakes in the global carbon cycle.