Deconvolution of the tree ring based delta/sup 13/C record
We assumed that the tree-ring based /sup 13/C//sup 12/C record constructed by Freyer and Belacy (1983) to be representative of the fossil fuel and forest-soil induced /sup 13/C//sup 12/C change for atmospheric CO/sub 2/. Through the use of a modification of the Oeschger et al. ocean model, we have computed the contribution of the combustion of coal, oil, and natural gas to this observed /sup 13/C//sup 12/C change. A large residual remains when the tree-ring-based record is corrected for the contribution of fossil fuel CO/sub 2/. A deconvolution was performed on this residual to determine the time history and magnitude of the forest-soil reservoir changes over the past 150 years. Several important conclusions were reached. (1) The magnitude of the integrated CO/sub 2/ input from these sources was about 1.6 times that from fossil fuels. (2) The forest-soil contribution reached a broad maximum centered at about 1900. (3) Over the 2 decade period covered by the Mauna Loa atmospheric CO/sub 2/ content record, the input from forests and soils was about 30% that from fossil fuels. (4) The /sup 13/C//sup 12/C trend over the last 20 years was dominated by the input of fossil fuel CO/sub 2/. (5) The forest-soil release did not contribute significantly to the secular increase in atmospheric CO/sub 2/ observed over the last 20 years. (6) The pre-1850 atmospheric p2 values must have been in the range 245 to 270 x 10/sup -6/ atmospheres.
- OSTI ID:
- 5765728
- Journal Information:
- J. Geophys. Res.; (United States), Vol. 88:C6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
03 NATURAL GAS
CARBON CYCLE
ENVIRONMENTAL TRANSPORT
EARTH ATMOSPHERE
TREE RINGS
ISOTOPE RATIO
BIOSPHERE
CARBON 12
CARBON 13
CARBON DIOXIDE
FOSSIL FUELS
NUMERICAL SOLUTION
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
ENERGY SOURCES
ENVIRONMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FUELS
ISOTOPES
LIGHT NUCLEI
MASS TRANSFER
NUCLEI
OXIDES
OXYGEN COMPOUNDS
STABLE ISOTOPES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
010900 - Coal
Lignite
& Peat- Environmental Aspects
020900 - Petroleum- Environmental Aspects
030800 - Natural Gas- Environmental Aspects