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- W2209997133 abstract "A very close coupling exists between changes in atmospheric O2 and CO2 concentrations, owing to the chemistry of photosynthesis, respiration, and combustion. The coupling is not perfect, however, because CO2 variations are partially buffered by reactions involving the inorganic carbon system in seawater, which has no effect on O2. Measurements over the past two decades document variations in O2 on a range of space and time scales, including a long-term decrease driven mostly by fossil fuel burning and seasonal cycles driven by exchanges with the land biosphere and the oceans. In this chapter, these and other features seen in the measurements are described, also discussing variations in the tracer ‘atmospheric potential oxygen,’ which is a linear combination of O2 and CO2 designed to be insensitive to exchanges from the land biosphere and thereby sensitive mostly to oceanic processes. Challenges associated with measuring variations in O2 are addressed, and various applications of the observations are discussed, including quantifying the magnitude of the global land and ocean carbon sinks and testing ocean biogeochemical models. An updated budget for global carbon sinks based on O2 measurements from the Scripps O2 program is presented for the decades of the 1990s and 2000s." @default.
- W2209997133 created "2016-06-24" @default.
- W2209997133 creator A5073053492 @default.
- W2209997133 creator A5076790483 @default.
- W2209997133 date "2014-01-01" @default.
- W2209997133 modified "2023-10-13" @default.
- W2209997133 title "Studies of Recent Changes in Atmospheric O2 Content" @default.
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