Boundary-layer budget estimations of CO2 fluxes over the Swedish Recab area
Abstract
A convective boundary layer (CBL) can be treated as a large cuvette, in which the surface fluxes of CO_2 can be inferred from measured changes in CO_2 concentrations and CBL height over time. This method was used to calculate regional-scale CO_2 fluxes over the Swedish Recab area in August 2001. The necessary data were obtained during an intensive field campaign involving measurements from several towers, a small flux aircraft and another aircraft used for boundary-layer profiling. In the study area, a 100 m high tower measures profile and flux continuously. The aim of the present study was to see if the accurately measured temporal CO_2 concentration changes at the top of that high tower could be representative for the concentration changes in the whole boundary layer and if they could be used in combination with the large-scale ECMWF data and the boundary layer height modelling to calculate regional CO_2 fluxes. If so, the method could be used for long-term flux estimates over the area. Comparisons were made between the tower-measured CO_2 concentrations and the aircraft-measured boundary layer concentration profiles, the modelled boundary layer heights and the heights determined from the measured temperature profiles and also the calculated CO_2 fluxes and the fluxes from the towers and the flux aircraft.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA.....6118M