Data/hora: 24/06/2024 19:51:19

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 29/06/1995
Data da última atualização: | 05/04/2017
Autoria: | TAYLOR, J. A.; LLOYD, J.
Título: | Sources and sinks of atmospheric CO2.
Ano de publicação: | 1992
Fonte/Imprenta: | Australian Journal of Botany, v.40, n.4/5, p.407-418, 1992.
Idioma: | Inglês
Conteúdo: | The biosphere plays an important role in determining the sources, sinks, levels and rates of change of atmospheric CO2 concentrations. Significant uncertainties remain in estimates of the fluxes of CO2 from biomass burning and deforestation and uptake and storage of CO2 by the biosphere arising from increased atmospheric CO2 concentrations. Calculation of problale rates of carbon sequestration for the major ecosystem complexes and global 3-D tracer transport model runs indicate the possibility that a significant net CO2 uptake (>1 Pg C yr-1) a CO2 fertilisation effect may be occurring in tropical rainforests, effectively accounting for much of the missing sink. This sink may currently balance much of the CO2 added to the atmosphere from deforestation and biomass burning. Interestingly, CO2 released from biomass burning may itself be playing an important role in enhanced carbon storage by tropical rainforests. This has important implications for predicting future CO2 concentrations. If tropical rainforest destruction continues then much of the CO2 stored as a result of the CO2 fertilisation effect will be released to the atmosphere and much of the missing sink will disappear. These effects have not been considered in the IPCC (Intergovernmental Panel on Climate Change) projections of future atmospheric CO2 concentrations. Predictions which take account of the combined effects of deforestation, the return of carbon previously stored throught the CO2 fertilisation effect and the loss of a large proportion of the missing sink as a result of deforestation whould result in much higher predicted concentrations and rates of increase of atmospheric CO2 and as a consequence accelerated rates of climate change.
Palavras-Chave: | Atmospheric; Biosfera; Tropical forest.
Thesagro: | Atmosfera; Desmatamento; Floresta Tropical.
Thesaurus Nal: | biosphere; deforestation.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (28445-1) - ADD - SP - PP - SP14442 -  - 14442 - DIS