Data for paper 'Estimating intra-seasonal intrinsic water-use efficiency from high-resolution tree-ring δ13C data in boreal Scots pine forests'

This dataset supports the study of Tang et al. (2022) accepted by New Phytologist. In Tang et al. (2022), we estimated intrinsic water-use efficiency (iWUE), a key index for carbon and water balance, from tree-ring δ¹³C data (iWUE_iso) at high-resolution intra-seasonal scale for two <em>Pinus</em> <em>sylvestris </em>forests from 2002 to 2019. We compared the intra-seasonal variations and inter-annual trends of iWUE_iso with that of iWUE estimated from eddy-covariance (iWUE_EC) and leaf gas exchange data (iWUE_gas). We also quantified how iWUE_iso estimates were impacted by post-photosynthetic δ¹³C modification and non-explicit consideration of mesophyll and photorespiratory effects in iWUE_iso calculations. This dataset includes (1) intra-seasonal tree-ring δ¹³C data for the two study sites from 2002 to 2019; (2) δ13C of leaf and phloem sugars for the two study sites in year 2018 to quantify post-photosynthetic δ¹³C modification; (3) iWUE_iso, iWUE_gas and iWUE_EC data series at intra-seasonal and inter-annual scales from 2002 to 2019 in the two study sites.