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Fractionation of oxygen isotopes by respiration and diffusion in soils and its implications for the isotopic composition
 

Summary: Fractionation of oxygen isotopes by respiration and diffusion
in soils and its implications for the isotopic composition
of atmospheric O2
Alon Angert and Boaz Luz
Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel
Dan Yakir
Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot, Israel
Abstract. The 18
O content of atmospheric O2 is an important tracer for past changes in the
biosphere and has been used to estimate changes in the balance between terrestrial and marine
productivity. Its quantitative use depends on knowledge of the isotopic fractionations associated
with the various O2 production and consumption processes. Here we monitored oxygen
concentration and d18
O of O2 in sandy and clayey soils to evaluate in situ 18
O fractionation
associated with soil respiration. In the clayey soil, O2 concentrations decreased as low as 1% at 150
cm depth, and d18
O values ranged from 0% to 1.6% relative to atmospheric O2. In the sandy soil
the O2 concentration was 20.3820.53%, and d18
O values were 0.06 0.015% to 0.06

  

Source: Alon, Angert - Institute of Earth Sciences, Hebrew University of Jerusalem

 

Collections: Geosciences