Age‐Related Climate Response of Tree‐Ring δ13C and δ18O From Spruce in Northwestern China, With Implications for Relative Humidity Reconstructions,Journal of Geophysical Research: Biogeosciences

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Age‐Related Climate Response of Tree‐Ring δ13C and δ18O From Spruce in Northwestern China, With Implications for Relative Humidity Reconstructions
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2020-04-25 , DOI: 10.1029/2019jg005513
Guobao Xu _{1,

2} , Guoju Wu ₁ , Xiaohong Liu _{1,

3} , Tuo Chen ₁ , Bo Wang ₁ , Amy Hudson ₂ , Valerie Trouet ₂

Affiliation

Understanding varying climate responses in tree‐ring data across tree ages is important, but little is known about tree‐age effects on climate responses in tree‐ring stable isotopes. To detect whether age differences in tree‐ring δ¹³C and δ¹⁸O could lead to differing climate responses, we measured tree‐ring cellulose δ¹³C and δ¹⁸O (1901–2010) from Schrenk spruce (Picea schrenkiana ) trees in northwestern China with ages ranging from 110 to 470 years, which we binned into three age groups. Tree‐ring δ¹³C (pin‐corrected) and δ¹⁸O exhibited similar year‐to‐year variability between age groups and did not feature age‐related trends. δ¹³C series from old trees (270–470 years) showed stronger legacy effects, reflecting influences from the antecedent period (due to carbohydrate reserves and climate), compared to young trees (110–125 years). Both tree‐ring δ¹³C and δ¹⁸O values decreased with increasing relative humidity (RH) and precipitation and with decreasing mean and maximum temperatures during the main growing season (May–August). δ¹³C and δ¹⁸O exhibited age‐dependent climate responses: Young trees had a stronger climate response in δ¹³C but a weaker or similar climate response in δ¹⁸O compared to old trees. We developed multiple growing‐season RH reconstructions based on composite chronologies using δ¹³C and δ¹⁸O series from different age groups. In particular, we found that including δ¹³C from young trees improved the skill of RH reconstructions because of the age‐specific mechanisms driving the δ¹³C‐climate relationship, but that caution is warranted with regard to extreme values. We therefore suggest that young trees should be considered when using stable isotopes, particularly in δ¹³C, for climate reconstruction.

更新日期：2020-04-25

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