The format of the workshop will be a mixture of presentation and breakout groups with discussions in the plenary. The presentations will cover the needs of GEWEX, the current usage of data sets in climate analysis, existing data sets and validation data and methodology.
Currently we plan for two breakout groups:
1. Feedback on the current water vapour data sets discussing:
a. Impact of uncertainties in climate applications;
b. Identification of gaps in existing and planned data sets;
c. Needs for improvement and/or redesign.
2. Feedback group on a comparison of temperature/water vapour data sets discussing:
a. What data sets can participate?
b. Develop a strategy for the assessment, particularly establishing a basis for estimating the range of uncertainties in such data on various time and space scales. One question is at what space and time scales should the comparison be performed to assess systematic differences due to (1) different instruments, (2) different (inter)calibration procedures, (3) different retrieval schemes including their a priori and cloud mask, (4) different aggregation and data reduction schemes, etc.?
c. What independent validation data are available and what validation methodology is appropriate at what level of data?