Modeling seasonal changes of atmospheric carbon dioxide and carbon 13
A two-dimensional (latitude-altitude) model of atmospheric CO/sub 2/ and delta/sup 13/C was constructed to simulate some features of seasonal carbon cycle fluctuations. The model simulates air-sea exchange, atmospheric diffusion, and fossil fuel carbon sources, which are functions of time and latitude. In addition, it uses biosphere-atmosphere fluxes of carbon that are based on global-scale biological models of vegetation growth and decay. Results of the model show fair agreement with observational results for CO/sub 2/ and delta/sup 13/C seasonal fluctuations. Their model results have far northern fluctuations with smaller amplitudes than are observed. Analysis of sources of CO/sub 2/ change at given latitudes shows that, for far southern latitudes, southern hemisphere biospheric fluxes are dominant in affecting the seasonal CO/sub 2/ fluctuations. Long-term decrease of delta/sup 13/C for the model is larger than for observations. This may be due to errors in the formulation for oceanic fluxes for /sup 13/C in the model or to a net uptake of carbon by the biosphere.
- Research Organization:
- NOAA Air Resources Lab., Boulder, CO
- OSTI ID:
- 6900274
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 91:D4; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Seasonal and inter-annual variability in 13C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains
Activities of the global biosphere as reflected in atmospheric CO/sub 2/ records
Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
500300 -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AIR-WATER INTERACTIONS
BIOSPHERE
CARBON 13
CARBON COMPOUNDS
CARBON CYCLE
CARBON DIOXIDE
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
ENVIRONMENT
EVEN-ODD NUCLEI
GEOGRAPHICAL VARIATIONS
ISOTOPES
LATITUDE EFFECT
LIGHT NUCLEI
MATHEMATICAL MODELS
NUCLEI
OXIDES
OXYGEN COMPOUNDS
POLLUTION
POLLUTION SOURCES
RADIOECOLOGICAL CONCENTRATION
SEASONAL VARIATIONS
STABLE ISOTOPES
VARIATIONS