13 C response surface resolves humidity and temperature signals in trees

Details 13 C response surface resolves humidity and temperature signals in trees 13 C response surface resolves humidity and temperature signals in trees

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000gecoa..64..161e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 64, Issue 2, pp.161-167

Physics

11

Scientific paper

Stem cellulose of bean plants ( Vicia faba ) grown under controlled conditions exhibits inverse linear carbon-isotope reactions to changes in both relative humidity (RH) and temperature (T), readily mappable as a planar 13 C response surface in RH-T space. The analogous response surface for annual late-wood cellulose 13 C from a field calibration using fir trees ( Abies alba ) in the Black Forest, southern Germany, also supports resolution of independent -RH and -T effects. The response of cellulose 13 C to RH and T derived from this new calibration differs markedly from estimates based on univariate linear regression analysis: The sensitivity of 13 C to RH is stronger than that inferred previously ( c. -0.17 /% vs. -0.12 /%, respectively), whereas the -T coefficient is weaker and reversed in sign ( c. -0.15 /K vs. +0.36 /K). This new perspective on the coupled influence of moisture and temperature changes on tree-ring cellulose 13 C helps to unify divergent observations about carbon-isotope signals in trees, especially the broad range of apparent -T relations obtained in calibration studies, which are often used as paleoclimate transfer functions. Although this highlights the large potential uncertainties surrounding paleoclimate reconstruction based solely on 13 C data, coupling of the carbon-isotope response-surface approach with equivalent response surfaces for hydrogen or oxygen isotopes may afford new opportunities for investigating the nature of past climate variability and change from tree-ring sequences.

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