Chamber adaptations for CO2 flux measurements in small streams: making them smaller and lighter
Salimon, Universidade Federal do Acre, firstname.lastname@example.org
Sousa, CiŽncias Ambientais - UFPA/MPEG/EMBRAPA, email@example.com
CO2 outgasing from rivers in the Amazon basin has been given great attention in the last five years, since it plays a major role in the regional carbon balance, and might be one of the flowpaths that could be ďinvisibleĒ to eddy covariance and towers methodology. The usual chamber and floating apparatus used for CO2 flux measurements in water are quite large and heavy, with a total volume of 30 liters (maximum length 100 cm and maximum widh 50 cm) and were designed for ocean measurements, which restricts the distance that can be traveled by feet when measuring flux in small streams in forests or pastures where no road can be used (specially in the rainy season). We propose here to adapt usual soil chambers, which are smaller and lighter and therefore require smaller floating apparatus, with total volume of 5 liters (maximum length 50 cm and maximum widh 30 cm). In order to estimate the performance in these two chambers we will be measuring CO2 fluxes with both systems in small streams and medium size rivers in Southwestern Amazonia (Acre State) to compare the differences between them. Results will be available in late September for the LBA-ECO meeting.