Preprints
https://doi.org/10.5194/essd-2020-236
https://doi.org/10.5194/essd-2020-236

  21 Sep 2020

21 Sep 2020

Review status: this preprint is currently under review for the journal ESSD.

HydroGFD3.0: a 25 km global near real-time updated precipitation and temperature data set

Peter Berg, Fredrik Almén, and Denica Bozhinova Peter Berg et al.
  • Swedish Meteorological and Hydrological Institute, Folkborgsvägen 17, 601 76 Norrköping, Sweden

Abstract. HydroGFD (Hydrological Global Forcing Data) is a data set of bias adjusted reanalysis data for daily precipitation, and minimum, mean, and maximum temperature. It is mainly intended for large scale hydrological modeling, but is also suitable for other impact modeling. The data set has an almost global land area coverage, excluding the Antarctic continent, at a horizontal resolution of 0.25°, i.e. about 25 km. It is available for the complete ERA5 reanalysis time period; currently 1979 until five days ago. This period will be extended back to 1950 once the back catalogue of ERA5 is available. The historical period is adjusted using global gridded observational data sets, and to acquire real-time data, a collection of several reference data sets is used. Consistency in time is attempted by relying on a background climatology, and only making use of anomalies from the different data sets. Precipitation is adjusted for mean bias as well as the number or wet days in a month. The latter is relying on a calibrated statistical method with input only of the monthly precipitation anomaly, such that no additional input data about the number of wet days is necessary. The daily mean temperature is adjusted toward the monthly mean of the observations, and applied to 1 h timesteps of the ERA5 reanalysis. Daily mean, minimum and maximum temperature are then calculated. The performance of the HydroGFD3 data set is on par with other similar products, although there are significant differences in different parts of the globe, especially where observations are uncertain. Further, HydroGFD3 tends to have higher precipitation extremes, partly due to its higher spatial resolution. In this paper, we present the methodology, evaluation results, and how to access to the data set at https://doi.org/10.5281/zenodo.3871707.

Peter Berg et al.

 
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Peter Berg et al.

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HydroGFD3.0 P. Berg, F. Almén, and D. Bozhinova https://doi.org/10.5281/zenodo.3871707

Peter Berg et al.

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Short summary
HydroGFD3.0 (Hydrological Global Forcing Data) is a data set daily precipitation and temperature intended for use in hydrological modeling. The method uses different observational data sources to correct the variables from a model estimation of precipitation and temperature. An openly available data set covers the years 1979–2019, and times after this are available by request.