Record Display for the EPA National Library Catalog


Main Title Lifetime of Excess Atmospheric Carbon Dioxide.
Author Moore, B. ; Braswell, B. H. ;
CORP Author New Hampshire Univ., Durham. Inst. for the Study of Earth, Oceans and Space.;Environmental Research Lab., Athens, GA. Office of Research and Development.
Publisher c1994
Year Published 1994
Report Number EPA-R-816278; EPA/600/J-94/459;
Stock Number PB95-131132
Additional Subjects Climatic changes ; Global ; Biosphere ; Atmospheric composition ; Carbon dioxide ; Forest management ; Plant growth ; Mathematical models ; Decay ; Half life ; Ocean environments ; Carbon cycle ; Equilibrium ; Terrestrial radiation ; Delta function ; Exponential functions ; Concepts Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB95-131132 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 18p
The authors explore the effects of a changing terrestrial biosphere on the atmospheric residence time of carbon dioxide using three simple ocean carbon cycling models and a model of global terrestrial carbon cycling. We find differences in model behavior associated with the assumption of an active terrestrial biosphere (forest regrowth) and significant differences if we assume a donor-dependent flux from the atmosphere to the terrestrial component (e.g., a hypothetical terrestrial fertilization flux). To avoid numerical difficulties associated with treating the atmospheric carbon dioxide decay (relaxation) curve as being well approximated by a weighted sum of exponential functions, we define the single half-life as the time it takes for a model atmosphere to relax from its present-day value half way to its equilibrium sub p CO2 value. This scenario-based approach also avoids the use of unit pulse (Dirac Delta) functions which can prove troublesome or unrealistic in the context of a terrestrial fertilization assumption.