Triple-isotope composition of atmospheric oxygen as a tracer of biosphere productivity.

Looks at triple-isotope composition of atmospheric oxygen as a tracer of biosphere productivity. The three natural occurring isotopes of oxygen; Dependence on the isotopic composition of photosynthetically produced O2 from terrestrial and aquatic plants; Estimate of the size of the 17O/16O anomaly in tropospheric O2; Reflection of the influence of the influence of biospheric cycling and stratospheric photochemical processes; Proposal.