Assessing the Applicability of Multi-Source Precipitation Merged Products on the Northeast Side of Tibetan Plateau

Abstract

Based on the automatic station observations in central Gansu, the applicability of multi-source precipitation merged products in Lanzhou and Wuwei cities, which are located on the northeast side of the Tibetan Plateau, is assessed using usual station verification and near gridding verification methods. Data are provided by the National Meteorological Information Center. The results are as follows. 1) The assimilation abilities of the two sources merged precipitation data and the three sources merged precipitation data to actual precipitation are great. The precipitation product merged from three sources is better than that from two sources, which is due to the smaller error and higher accuracy of three source merging precipitation data. However, the two types of precipitation-merged products underestimated the observational ones to certain extend. 2) Altitude has little effect on precipitation error, and the error in the transition zone from mountain to plain is relatively large. 3) The hourly merged precipitation analysis product has stronger reproducibility for weak precipitation and is closer to the observed precipitation. 4) The frequency of precipitation reflected by the merged product is larger than the observational field, while the precipitation intensity is reverse.