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High‐resolution δ 13 C measurements of oak show a previously unobserved spring depletion
Author(s) -
Ogle Neil,
McCormac F. G.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02484
Subject(s) - spring (device) , depletion region , geology , atmospheric sciences , environmental science , physics , quantum mechanics , semiconductor , thermodynamics
We have subdivided single tree rings into between 24 and 35 contiguous samples and measured the δ 13 C value for each. These high‐resolution measurements show a previously unobserved spring depletion as part of a pattern of enrichment‐depletion‐enrichment‐depletion through a single growing season as opposed to the depletion‐enrichment‐depletion cycle previously thought to exist. The earlywood/latewood transition does not coincide with identifiable isotopic boundaries and therefore is not a suitable demarcation point for sampling as part of palaeoclimatic study. Latewood and post spring depletion values of δ 13 C were separately correlated with geophysical parameters. Post spring depletion wood yielded better correlations and is therefore more suitable for palaeoclimatic study.