Work package 1 also deals with interpolation of processed observations on the European scale and connects and interacts with European efforts on the global as well as regional and national scale. In particular the interpolation methods are being developed to take better account of the physical structures of precipitation and temperature and with respect to the land orographic structures. In addition, as it is in UERRA, uncertainty estimation evaluation methods have been developed.


More data and new versions of data sets (E-OBS and CRU in particular) have been released. There is a much increased interest in very recent data analyses in near real time due to climate variations and recent records seen in the climate change.


In UERRA the gridded observational data sets are seen as complimentary information that may even be used for some data that are not available otherwise. Otherwise, the main connection with the main reanalysis Numerical Weather Prediction (NWP) model based reanalyses, is for validation and use as a mainly independent data set. The Work Package 3 in UERRA works with such methods and with estimation of uncertainties in the reanalysis and will use both these moderate resolution but all area covering, data sets and supplemented by regional and national data sets produced with other resources but provided to UERRA through the UERRA partners and scientists. The more local data sets are of very high resolution and allow for detailed analysis of error structures and particularly of correlations both in space at high (2 km) resolution and in time.