Reconstruction of precipitation δ18O over the Tibetan Plateau since 1910

An accurate representation of the spatiotemporal variation of stable isotopes in precipitation over the Tibetan Plateau (TP) is critical information for hydrological and ecological applications for the region. This paper reconstructs annual O-18 data with 2.5 degrees x3.75 degrees latitude-longitude resolutions over the TP since 1910 using the spectral optimal gridding (SOG) method. The SOG calculates empirical orthogonal functions (EOFs) from the Laboratoire de Meteorologie Dynamique isotopic version general circulation model over the TP from 1978 to 2007 and regresses the O-18 data of 10 ice cores over TP against the EOF basis functions. The reconstructed data can effectively demonstrate spatiotemporal characteristics of TP precipitation O-18. The spatial average interannual O-18 anomalies agree well with the time series of Guliya ice core O-18, implying Guliya O-18's typical representation of the TP O-18 temporal variation.