ICOS-INWIRE report 6.3 comp TCCON
A comparison of TCCON observations of column-averaged dry air mole fractions of CO2 with a combination of tall-tower based in-situ profile observations for the PBL, boundary layer height data, and TM3-simulated CO2 mixing ratios for the free troposphere. In general, the dry-air mole fractions retrieved by the different methods (TM3 model, synthetic model + tall-tower in-situ, TCCON) agreed within limits. The model-derived columns are likely biased high vs. TCCON during winter and also possibly during summer. One possible reason could be that the age of air in the stratosphere is too low in the TM3 model. This would lead to overestimated CO2 values in the upper part of the column. More surprising was the small difference between CO2 profiles derived from model + in-situ observations vs. just modelled ones. The original expectation had been that stronger impacts would be found when using in-situ observations from the towers rather than TM3 model output. However, this was only found for Orleans but not for Bialystok.
- Developing and testing autonomous stations equipped with greenhouse gas concentration (WP2) and fluxes (WP3) sensor systems able to operate autonomously in remote areas and in technically challenging environments.
- Enhancing the capabilities of the ICOS atmospheric and ecosystem networks through the ICOS Thematic Centers for producing new timely delivery and near real time data products as well as of GHG surface (ICOS) and total column (TCCON) concentration, boundary layer height from lidar (WP3), and eddy-covariance GHG fluxes (WP5)
- Developing integrated data-products combining ground-based upward looking remote sensing and surface in-situ measurements to validate satellite retrievals (WP5 and WP6)
- Improving inter-operability between ICOS and other in-situ GHG monitoring networks, through the development of innovative software and database tools (WP6) that will deliver data to the GMES
This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement n°313169.