Scientists enhance gridded precipitation dataset for Tibetan Plateau

An valid gridded precipitation dataset is fundamental for a bigger figuring out of climate alternate, and hydrological and ecological processes on the Tibetan Plateau. On the opposite hand, the precipitation observation community on this plot is sparse. The observed precipitation is at probability of advanced meteorological and orographic stipulations, limiting the accuracy of the gridded precipitation dataset. The diversity of precipitation instruments within the Tibetan Plateau and surrounding areas has additionally severely affected the correction of measured precipitation.

By compensating the precipitation undercatch from diversified sorts of instruments all the plan in which via the Tibetan Plateau and optimizing the precipitation frequency distribution within the interpolation plan, a learn body of workers from the Northwest Institute of Eco-Environment and Sources (NIEER) of the Chinese Academy of Sciences (CAS) proposed a brand unusual precipitation dataset.

The dataset makes spend of the observed precipitation of 159 stations as the recordsdata source (Fig. 1) and corrects the gauge undercatch. Then by comparing six in most cases used interpolation schemes utilizing precipitation frequency error as the evaluate favorite, the optimal interpolation plan valid for the Tibetan Plateau is received.

Besides, a situation of day after day gridded precipitation dataset with a spatial determination of 10km from January 1, 1980 to December 31, 2009 is received in accordance with those works.

The outcomes uncover that undercatch correction is fundamental for save recordsdata, which would maybe decrease the distributional error by 30% at most. A skinny-plate splines interpolation algorithm pondering altitude as a covariate is helpful to diminish the statistical distributional error in traditional.

When put next with the present gridded precipitation dataset, this dataset has better precipitation frequency distribution characteristics, a extra realistic indicate designate, variance, and a bigger suppressive smoothing pause widely present within the old gridded precipitation merchandise (Fig. 2).

The outcomes provide a quite loyal gridded precipitation dataset for those hydrometeorological experiences on the Tibetan Plateau.

The dataset has been revealed online in a paper titled “Cutting back the Statistical Distribution Error in Gridded Data for the Tibetan Plateau” within the Journal of Hydrometeorology.

Extra records:
Jiapei Ma et al. Cutting back the Statistical Distribution Error in Gridded Precipitation Data for the Tibetan Plateau, Journal of Hydrometeorology (2020). DOI: 10.1175/JHM-D-20-0096.1