Oxygen isotope ratios of cellulose-derived phenylglucosazone: An improved paleoclimate indicator of environmental water and relative humidity

Leonel Sternberg, Maria C. Pinzon, Patricia F. Vendramini, William T. Anderson, A. Hope Jahren, Kristina Beuning

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Oxygen atoms within fossil wood provide high-resolution records of climate change, particularly for the Quaternary. However, current analysis methods of fossil cellulose do not differentiate between different positions of the oxygen atoms. Here, we propose a refinement to tree-cellulose paleoclimatology modeling, using the cellulose-derived compound phenylglucosazone as the isotopic substrate. Stem samples from trees were collected at northern latitudes as low as 24°37′N and as high as 69°00′N. We extracted stem water and cellulose from each stem sample and analyzed them for their 18O content. In addition, we derived the cellulose to phenylglucosazone, a compound which lacks the oxygen attached to the second carbon of the cellulose-glucose moieties. Oxygen isotope analysis of phenylglucosazone allowed us to calculate the 18O content of the oxygen attached to the second carbon of the cellulose-glucose moieties. By way of these analyses, we tested two hypotheses: first, that the 18O content of the oxygen attached to second carbon will more closely reflect the 18O content of the stem water, and will not resemble the 18O content of either cellulose or its derivative phenylglucosazone. Second, tree-ring models that incorporate the variable oxygen isotope fractionation shown here and elsewhere are more accurate than those that do not. Our first hypothesis was rejected on the basis that the oxygen isotope ratios of the oxygen attached to the second carbon of the glucose moieties had a noisy isotopic signal with a large standard deviation and gave the poorest correlation with the oxygen isotope ratios of stem water. Related to this isotopic noise, we observed that the correlation between oxygen isotope ratios of phenylglucosazone with both stem water and relative humidity were higher than those observed for cellulose. Our hypothesis about tree-ring models which account for changes in the oxygen isotopic fractionation during cellulose synthesis was consistent only for the 18O content of phenylglucosazone. We showed that the tree-ring model based on the 18O content of phenylglucosazone was an improvement over existing models that are based on whole cellulose. Additionally, this approach may be used in other cellulose based archives such as peat deposits and lacustrine sediments.

Original languageEnglish
Pages (from-to)2463-2473
Number of pages11
JournalGeochimica et Cosmochimica Acta
Volume71
Issue number10
DOIs
StatePublished - May 15 2007

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Oxygen Isotopes
oxygen isotope ratio
paleoclimate
Cellulose
cellulose
relative humidity
Atmospheric humidity
Water
Oxygen
stem
oxygen
water
Carbon
tree ring
glucose
carbon
Fractionation
Glucose
oxygen isotope
indicator

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Oxygen isotope ratios of cellulose-derived phenylglucosazone : An improved paleoclimate indicator of environmental water and relative humidity. / Sternberg, Leonel; Pinzon, Maria C.; Vendramini, Patricia F.; Anderson, William T.; Jahren, A. Hope; Beuning, Kristina.

In: Geochimica et Cosmochimica Acta, Vol. 71, No. 10, 15.05.2007, p. 2463-2473.

Research output: Contribution to journalArticle

Sternberg, Leonel ; Pinzon, Maria C. ; Vendramini, Patricia F. ; Anderson, William T. ; Jahren, A. Hope ; Beuning, Kristina. / Oxygen isotope ratios of cellulose-derived phenylglucosazone : An improved paleoclimate indicator of environmental water and relative humidity. In: Geochimica et Cosmochimica Acta. 2007 ; Vol. 71, No. 10. pp. 2463-2473.
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AU - Jahren, A. Hope

AU - Beuning, Kristina

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