GrieSSinger, J., Braeuning, A., Helle, G., Schleser, G., Hochreuther, P., Meier, W. and Zhu, H.: A Dual Stable Isotope Approach Unravels Common Climate Signals and Species-Specific Responses to Environmental Change Stored in Multi-Century Tree-Ring Series from the Tibetan Plateau, Geosciences, 9(4), 151, doi:10.3390/geosciences9040151, 2019.

A Dual Stable Isotope Approach Unravels Common Climate Signals and Species-Specific Responses to Environmental Change Stored in Multi-Century Tree-Ring Series from the Tibetan Plateau

Please check inferred material, should this be soil or leaf water? Please check isotopeInterpretation1_name: can this be changed to a standardized term? eg. P_isotope (GF)

TP (31/12/19): climate interpretation (T_air-positive) removed from isotopeInterpretation3; isotopeInterp2 was incomplete and removed; OCh: replaced to P_E (precipitation_Evaporation, PDSI), Soil water replaced to Leaf water

Calibration with instrumental rainfall record; More specifically, inverse correlations between the I´18O of precipitation and the amount of precipitation are observed at low latitudes, known as the a€˜amount effecta€™ (AraguA¡s-AraguA¡s et al., 1998; Dansgaard, 1964). Therefore, smaller amounts of precipitation are associated with higher I´18O values for precipitation, representing the enrichment of 18O in the source water that is taken up by the trees.

Warmer conditions enhance the evaporation of the soil water, which increases δ18O in the source water.

The isotopic composition of the leaf water originating from soil moisture is subsequently modulated by its transpiration through the stomata, leading to the preferential loss of the lighter isotope (16O) and the consequent enrichment of the leaf water 18O. During the transpiration process, lower relative humidity increases the δ18O of the leaf water.

Because tree-ring δ18O correlates negatively with precipitation and relative humidity and positively with temperature, moisture-related climatic indices are expected to be suitable parameters to explain the variations in tree-ring oxygen isotopes.