Quantifying the effects of limited CO2 fertilization on future climate
The response of the land biosphere to the ongoing increase in atmospheric CO{sub 2} is not fully understood. To evaluate the approximate upper and lower limits of land sequestration of carbon, we performed simulations using a comprehensive carbon-climate model. In one case the land biosphere is vigorously fertilized by added CO{sub 2} and sequesters carbon throughout the 21st century. In a second case, CO{sub 2} fertilization saturates in year 2000; in this case the land becomes an additional source of CO{sub 2} by 2050. The predicted atmospheric CO{sub 2} concentration at year 2100 differs by 40% between the two cases. Current uncertainties preclude determination of whether the land biosphere will amplify or damp atmospheric CO{sub 2} increases by the end of the century.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15013893
- Report Number(s):
- UCRL-TR-203417; TRN: US200803%%1055
- Country of Publication:
- United States
- Language:
- English
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