Terrestrial Observation Panel on Climate (GCOS-GTOS) In situ issues WOAP-4 Hamburg March 2010 Han Dolman Chair of TOPC VU University Amsterdam

In situ provide a comprehensive observation basis regarding the land surface deliver long-term datasets to monitor trends and detect environmental changes in key terrestrial variables; provide crucial verifiable data for calibration and validation of satellite products; provide data to be integrated or assimilated within forecasting or analysis models; Provide regionalized and local data for use in downstream services. But, often run in research mode, no sustained funding, limited data access Data are being collected for non- climate purpose and have economic value (water, wood)

GTN-R There is concern at the lack of progress in GTN-H to get more river discharge stations on board

GTN-Permafrost, Glaciers do well Largely because there is dedicated institute (CALM). Aletsch use of Aster/GIS Data WGMC

EU: GMES Recommendations for In situ The GMES global land group proposes to select a number of networks for participation in a fast track in situ effort. Maturity of the network (state of harmonization/standardization, availability protocols, data quality control and data access) Relevance to global networks (e.g. the network forms part of a global network, e.g. GTN-G, GTN-H, FLUXNET, etc) Critical to understanding of changes in System Earth (GTN-P, LifeWatch, ICOS) Critical to providing local scale data and calibration/validation data for the space component of Global Land services Initially concentrate on coordination support activities

While we have a number of satellite ECV products, like albedo, Fapar etc., their validation is generally poor We need to find a mechanism to get our set of 35 global reference sites (linked with Fluxnet) and CEOS Cal-Val, similar to GRUAN