MSWEP (Multi-Source Weighted-Ensemble Precipitation) is a new global terrestrial precipitation (P) dataset (1979–2015) with a high 3-hourly temporal and 0.25° spatial resolution (Beck et al., 2016). The dataset is unique in that it takes advantage of a wide range of data sources, including gauge, satellite, and reanalysis data, to obtain the best possible P estimates at global scale. The following video shows 3-hourly P from MSWEP for the period June to December 2006:
The long-term mean of MSWEP is based on the elevation-corrected CHPclim dataset but replaced with more accurate regional datasets where available. A correction for gauge under-catch and orographic effects is introduced by inferring catchment-average P from streamflow observations at 13,762 stations across the globe.
The temporal variability of MSWEP is determined by weighted averaging of P anomalies from seven datasets; two based solely on interpolation of gauge observations (CPC Unified and GPCC), three on satellite remote sensing (CMORPH, GSMaP-MVK, and TMPA 3B42RT), and two on atmospheric model reanalysis (ERA-Interim and JRA-55).
MSWEP has been validated at global scale using hydrological modeling for approximately 9000 catchments and using independent P data from 125 FLUXNET stations. The dataset was found to perform favorably compared to popular gauge-adjusted datasets such as CPC Unified, TMPA 3B42, GPCP-1DD, and WFDEI-CRU. MSWEP was selected as the main P forcing for the state-of-the-art evaporation model GLEAM and for Tier-2 of the EU-FP7 project eartH2Observe. For more information about MSWEP, see the following open-access paper:
- Beck, H.E., A.I.J.M. van Dijk, V. Levizzani, J. Schellekens, D.G. Miralles, B. Martens, A. de Roo (2016): MSWEP: 3-hourly 0.25° global gridded precipitation (1979–2015) by merging gauge, satellite, and reanalysis data, Hydrology and Earth System Sciences Discussions, doi:10.5194/hess-2016–236.
MSWEP is available in the widely used netCDF format. Please enter your name and email address to receive the FTP address for downloading the data. By using MSWEP in any publication you agree to cite Beck et al. (2016). MSWEP is also available via a THREDDS data server. The map with bias correction factors, which can be used to reconstruct the original, non-corrected long-term averages, is available here (in GeoTIFF format).
Version 1.1 (2 August 2016) — No changes to the actual data, the only changes are in the netCDF formatting. First, we changed the order of the variables from “lon, time, lat” to “time, lat, lon”, which should solve some of the problems people have had with reading the data. Second, we fixed the time variable for the daily data, which was mistakenly offset by 1 day.
Version 1.0 (30 May 2016) — Initial release corresponding exactly to the description in Beck et al. (2016).
MSWEP is being developed by Hylke Beck (European Commission, Joint Research Centre, Ispra, Italy) in collaboration with Albert van Dijk (ANU, Canberra, Australia), Ad de Roo (JRC, Ispra, Italy), Vincenzo Levizzani (CNR-ISAC, Bologna, Italy), Jaap Schellekens (Deltares, Delft, The Netherlands), Diego Miralles (VU University Amsterdam, The Netherlands), and Brecht Martens (Ghent University, Belgium). We gratefully acknowledge the P dataset developers for producing and making their datasets available. The Global Runoff Data Centre (GRDC) and the U.S. Geological Survey (USGS) are thanked for providing most of the observed streamflow data. We would also like to thank the FLUXNET community for providing the eddy covariance data. This research received funding from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement no. 603608, “Global Earth Observation for integrated water resource assessment”: eartH2Observe.