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What is CREW?
Eumetsat's CREW (Cloud Retrieval Evaluation Workshop) is a research activity to evaluate the strengths and weaknesses of the most important algorithms that retrieve cloud property from passive imager instruments onboard both polar and geostationary satellites (SEVIRI, AVHRR, and MODIS). The CREW working group members operate the most advanced cloud retrieval algorithms. Their level-2 data products are inter-compared and validated against observations from the A-Atrain satellite constellation (CALIPSO, CLOUDSAT, and AMSR). The results of the inter-comparison are discussed at the Eumetsat Cloud Retrieval Intercomparioson Workshops. The first CREW took place in Norrköping, Sweden from 17.-19. May 2006, and the second CREW in Locarno, Switzerland in February 2009.
The third CREW will be held in Madison, USA from 15.-17. November 2011.
Why? – The science
Clouds cover about 70 % of the Earth's surface and play a dominant role in the energy and water cycle of our planet. Only satellite observations provide a continuous survey of the state of the atmosphere over the globe, at the space-time scales at which cloud processes occur. more here
How? - The approach
Currently 13 groups provide data sets of retrieved cloud physical properties, i.e., Cloud mask, cloud fraction, cloud top temperature, cloud top pressure, cloud top height, cloud optical depth, effective radius, cloud water path, cloud type, and convective signature. The data is inter-compared for 4 days, that were most suitable for validation purposes. We cooperate with the GEWEX - Cloud Assessment project that rather compares climatologies, whereas CREW is intended for investigating the details of the retrieval algorithms.
Who? - The members
Funded by
Organised by
List of Participants
For whom? – The users
Validation of weather and climate models, UV forecast, aviation, solar energy more here
