Evaluation of Spatial-Temporal Characteristics of Rainfall Variations over Thailand Inferred from Different Gridded Datasets

The fidelity of gridded rainfall datasets is important for the characterization features across globe. This study investigates climatology, interannual variability, and spatial-temporal variations seasonal over Thailand during 1970–2007 period using station data obtained from Thai Meteorological Department (TMDstn). In addition, performance three datasets, namely APHRODITE, CRU, GPCC, in reproducing these were intercompared further validated with results derived TMDstn. Results show that can reproduce spatial distribution TMDstn’s summer mean rainfall. However, large systematic underestimation seen while GPCC shows better agreement TMDstn as compared to others. winter, well captured by all data, especially upper part Thailand, they failed capture high intensity south eastern parts Thailand. Meanwhile, underestimated variability winter season Using EOF analysis, we demonstrate first two dominant modes rainfall, explained variance EOF-1. season, a good found between both pattern temporal variation. Overall, relatively climatology their year-to-year variation Furthermore, largely dependent on complexity topography. this indicates existence bias when Therefore, need users pay attention reliability trying identify possible mechanisms responsible