title: Air mass origin signals in δ18O of tree-ring cellulose revealed by back-trajectory modeling at the monsoonal Tibetan plateau.
abstract: A profound consideration of stable oxygen isotope source water origins is a precondition for an unambiguous palaeoenvironmental interpretation of terrestrial δ18O archives. To stress the influence of air mass origins on widely used δ18O tree-ring chronologies, we conducted correlation analyses between six annually resolved δ18O tree-ring cellulose ([Formula: see text]) chronologies and mean annual air package origins obtained from backward trajectory modeling. This novel approach has been tested for a transect at the southeastern Tibetan plateau (TP), where air masses with different isotopic composition overlap. Detailed examinations of daily precipitation amounts and monthly precipitation δ18O values ([Formula: see text]) were conducted with the ERA Interim and Laboratoire de Météorologie Dynamique General Circulation Model (LMDZiso) data, respectively. Particularly the southernmost study sites are influenced by a distinct amount effect. Here, air package origin [Formula: see text] relations are generally weaker in contrast to our northern located study sites. We found that tree-ring isotope signatures at dry sites with less rain days per year tend to be influenced stronger by air mass origin than tree-ring isotope values at semi-humid sites. That implies that the local hydroclimate history inferred from [Formula: see text] archives is better recorded at semi-humid sites.
authors.affiliation: Institute of Geography, University Erlangen-Nuremberg, Wetterkreuz 15, 91058, Erlangen, Germany. jakob.wernicke@fau.de.
authors.forename: Jakob
authors.initials: J
authors.lastname: Wernicke
authors.affiliation: Institute of Geography, University Erlangen-Nuremberg, Wetterkreuz 15, 91058, Erlangen, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Hochreuther
authors.affiliation: Institute of Geography, University Erlangen-Nuremberg, Wetterkreuz 15, 91058, Erlangen, Germany.
authors.forename: Jussi
authors.initials: J
authors.lastname: Grießinger
authors.affiliation: Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhu
authors.affiliation: Institute of Geographical Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing, China.
authors.forename: Lily
authors.initials: L
authors.lastname: Wang
authors.affiliation: Institute of Geography, University Erlangen-Nuremberg, Wetterkreuz 15, 91058, Erlangen, Germany.
authors.forename: Achim
authors.initials: A
authors.lastname: Bräuning
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D018653:Juniperus / Q000737:chemistry; D028221:Larix / Q000737:chemistry; D008962:Models, Theoretical; D010103:Oxygen Isotopes / Q000032:analysis*; D028222:Picea / Q000737:chemistry; D018609:Tibet; D014197:Trees / Q000737:chemistry; D014887:Weather
chemical_list: D010103:Oxygen Isotopes; D002482:Cellulose
keywords: Asian summer monsoon; Backward trajectory; Tibetan plateau; Tree-ring δ 18O