Remedy 2: Verification and further deployment of the GAIA-CLIM approach to metrological characterisation to Raman Lidar measurements

Primary gap remedy type: 
Proposed remedy description: 

Work within GAIA-CLIM has advanced the metrological characterisation of raman lidar water vapour products. Verification of the results generated in GAIA-CLIM is required prior to broad-scale adoption of the traceable measurement and processing approach by networks. At the same time work is required to improve the temporal coverage of measurements to increase their utility with a particular focus on advancing daytime measurements.


For water vapour lidar calibration, the proposed remedy will dramatically improve the traceability of water vapour Raman lidar measurements and data consistency globally, and will help to manage changes in the system.

Measurable outcome of success: 

Success would be, for example, if long term comparison between Raman lidar water vapour measurements and another traceable reference measurement technique (e.g. GRUAN radiosondes) would be compared over long term showing a reduction in the lidar calibration uncertainty using absolute techniques as well as the added value of synergetic lidar-radiometer products during daytime operations. Evidences of this improvement have been reported in literature but comparisons over long time periods have not been reported yet.

Expected viability for the outcome of success: 
  • High
Scale of work: 
  • Individually
  • Single institution
Time bound to remedy: 
  • Less than 5 years
Indicative cost estimate (investment): 
  • Low cost (< 1 million)
Potential actors: 
  • Academia, individual research institutes
  • SMEs/industry
  • National measurement institutes