Improved spring temperature reconstruction using earlywood blue intensity in southeastern China

Because instrumental observations are too short to fully represent long-term natural variability, high-resolution temperature proxy records essential understanding past climate and assessing current variability in the context of patterns. In subtropics, progress this field has been hampered by a relative lack long truly temperature-sensitive records. study, we provide an assessment dendroclimatic potential blue intensity (BI) ring-width (RW) measurements from two hot/humid Pinus massoniana sites China. Our results show that RW exhibits significant (p < .05) response precipitation over hydrological year (previous November October) winter–spring season (January March). We find earlywood parameter be most robust for reconstruction purposes; 1916–2015 period, it explains 36% regional-scale spring (March–May) variance. Strong agreements between observed large area southeastern China implied our exhibited high reliability spatial representation. As expected, reconstructed data directly correlated with El Niño–Southern Oscillation. These suggest there is great use BI advance regions hot humid regimes. However, more studies needed understand (1) which subtropical tree species will appropriate (2) how overcome biases differential staining sapwood heartwood.