- 1Dipartimento di Ingegneria Civile, Ambientale e Meccanica and Centro Agricoltura, Alimenti, Ambiente, Università di Trento, Italy (aquarius_baig@yahoo.com)
- 2Autorità distrettuale del bacino del Po, Parma, Italy
The Po river basin, in the north of Italy, is the lifeline of the economic and ecology of the North of Italy. The 661 km long river covers an area of 71327 km2 and replenishes the water demands of agriculture, industry and domestic consumers. The topography is diverse with alps mountains in the north and fertile plains in the south. The annual precipitation is 1200 mm which varies between ~2000 mm in the Alps to ~700 mm in the downstream. This study presents the estimates the precipitation on daily resolution over a grid of 1 km across the Po river basin for the period from 1991 to 2021, thus providing a consistent datasets for analyses of the recent climatology of the area. Total 1511 number of observed precipitation stations were included in the study along with topographic information. The statistical technique of kriging was employed to produce the grid data cube. The workflow of the study is summarized in the following steps:
- obtain the meteorological data from the data providers
- estimate the empirical semivariogram
- fit theoretical models to the empirical semivariogram and analyses of the statistical correlation
- use the theoretical model for solving the kriging system
- produce continuous surface maps or time series of the quantity desired in any gridded point of the domain
- calculate estimation errors.
For the estimation of errors Leave-one-out (LOO) is adopted which consists of removing a single station at a time and performing the interpolation for the location of the removed point by using the remaining stations. The approach is repeated until every station has been, in turn, removed and estimates are calculated for each station.
The results have shown that the average precipitation in the basin is 1131 mm with significant spatial patterns, some of which are reported for example. The northern subbasins have shown annual precipitation up to 2500 mm while the downstream planes receives up to 550 mm. The results show clear spatial and temporal patterns across the basin which are reported in the study.
How to cite: Baig, S., Roatti, G., Brian, M., Tornatore, F., Formetta, G., and Rigon, R.: Daily precipitation dataset (1991-2021) at 1 km resolution over the Po river basin area using Kriging, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-17581, https://doi.org/10.5194/egusphere-egu25-17581, 2025.
