Reconstruction of precipitation delta O-18 over the Tibetan Plateau since 1910

TitleReconstruction of precipitation delta O-18 over the Tibetan Plateau since 1910
Publication TypeJournal Article
Year of Publication2015
AuthorsGao J., Shen S.SP, Yao T.D, Tafolla N., Risi C., He Y.
JournalJournal of Geophysical Research-Atmospheres
Date Published2015/05
Type of ArticleArticle
ISBN Number2169-897X
Accession NumberWOS:000356696800025
Keywords18O spectral optimal gridding; ammonium record; climate-change; convection; glacier; ice cores; ice-core evidence; model; precipitation 18O; qinghai; reconstructed 18O data; stable-isotopes; temperature; Tibetan Plateau; variability

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.

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