Oxygen Isotope Ratios in Trees Reflect Mean Annual Temperature and Humidity

Details Oxygen Isotope Ratios in Trees Reflect Mean Annual Temperature and Humidity Oxygen Isotope Ratios in Trees Reflect Mean Annual Temperature and Humidity

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...211.1417b&link_type=abstract

Science, Volume 211, Issue 4489, pp. 1417-1419

Physics

34

Scientific paper

Values of the oxygen isotope ratios (δ 18O) in tree-ring cellulose closely reflect the δ 18O values in atmospheric precipitation and hence mean annual temperature. The change in δ 18O in cellulose is 0.41 per mil per degree Celsius for selected near-coastal stations. The values of δ 18O in precipitation and cellulose also change with altitude, as demonstrated for Mount Rainier, Washington. A temperature lapse rate of 5.2 degrees ± 0.5 degrees C per 1000 meters calculated from cellulose δ 18O values agrees with the accepted mean annual lapse rate of 5 degrees C per 1000 meters for this region. Cellulose δ 18O values and δ 18O values of carbon dioxide equilibrated with leaf water differ by a fixed 16 per mil.

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