TRMM precipitation downscaling in the data scarce Yarlung Zangbo River basin
Moisture migration distance (MMD) and NDVI were used to build a model of TRMM (tropical rainfall measuring mission)precipitation spatial-temporal downscaling for higher temporal-spatial resolution rainfall data production in the data scarce Yalung Zangbo river basin.The model was calibrated and validated using collected station observations in the area.MMD was found to correlate strongly with precipitation in the basin and better significance and representativeness was noted than traditional terrain factor DEM,and could eventually replace DEM in final spatial downscaling model;Accuracy of downscaled TRMM precipitation was found to vary significantly.The monthly R2 between downscaled and observed precipitation also varied from 0.5～0.9.RMSE fluctuated between 3.7 mm and 40 mm.R2 value was no more than 0.1 in some months due to observed extremes.Due to the poor accuracy of original TRMM daily precipitation in this area,the downscaled daily result showed less consistency with the observations,and the R2 was no more than 0.3 at all stations.
downscalingmoisture migration DistanceNDVITRMMYarlung Zangbo River
国家科技期刊平台
NSTL
万方数据
维普
