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Effects of photorespiration, the cytochrome pathway, and the alternative pathway on the triple isotopic composition of
 

Summary: Effects of photorespiration, the cytochrome pathway, and the
alternative pathway on the triple isotopic composition of
atmospheric O2
Alon Angert1
Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel
Shimon Rachmilevitch
Department of Plant Sciences, Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, Israel
Eugeni Barkan and Boaz Luz
Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel
Received 21 May 2002; revised 21 November 2002; accepted 21 November 2002; published 25 March 2003.
[1] The triple isotopic composition of atmospheric O2 is a new tracer used to estimate
changes in global productivity. To estimate such changes, knowledge of the relationship
between the discrimination against 17
O and the discrimination against 18
O is needed.
This relationship is presented as q = ln(17
a)/ln(18
a). Here, the value of theta was
evaluated for the most important processes that affect the isotopic composition of
oxygen. Similar values were found for dark respiration through the cytochrome pathway

  

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

 

Collections: Geosciences