Warm season precipitation signal in δ H values of wood lignin methoxyl groups from high elevation larch trees in Switzerland.

Rationale: In this study, we tested stable hydrogen isotope ratios of wood lignin methoxyl groups (δ H values) as a palaeoclimate proxy in dendrochronology. This is a quite new method in the field of dendrochronology and the sample preparation is much simpler than the methods used before to measure δ H values from wood.

Methods: We measured δ H values in high elevation larch trees (Larix decidua Mill.