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$ CO_{2} $-fertilization and potential future terrestrial carbon uptake in India
Abstract There is huge knowledge gap in our understanding of many terrestrial carbon cycle processes. In this paper, we investigate the bounds on terrestrial carbon uptake over India that arises solely due to CO2-fertilization. For this purpose, we use a terrestrial carbon cycle model and consider two extreme scenarios: unlimited $ CO_{2} $-fertilization is allowed for the terrestrial vegetation with $ CO_{2} $ concentration level at 735 ppm in one case, and $ CO_{2} $-fertilization is capped at year 1975 levels for another simulation. Our simulations show that, under equilibrium conditions, modeled carbon stocks in natural potential vegetation increase by 17 Gt-C with unlimited fertilization for $ CO_{2} $ levels and climate change corresponding to the end of 21st century but they decline by 5.5 Gt-C if fertilization is limited at 1975 levels of $ CO_{2} $ concentration. The carbon stock changes are dominated by forests. The area covered by natural potential forests increases by about 36% in the unlimited fertilization case but decreases by 15% in the fertilization-capped case. Thus, the assumption regarding $ CO_{2} $-fertilization has the potential to alter the sign of terrestrial carbon uptake over India. Our model simulations also imply that the maximum potential terrestrial sequestration over India, under equilibrium conditions and best case scenario of unlimited $ CO_{2} $-fertilization, is only 18% of the 21st century SRES A2 scenarios emissions from India. The limited uptake potential of the natural potential vegetation suggests that reduction of $ CO_{2} $ emissions and afforestation programs should be top priorities.
$ CO_{2} $-fertilization and potential future terrestrial carbon uptake in India
Abstract There is huge knowledge gap in our understanding of many terrestrial carbon cycle processes. In this paper, we investigate the bounds on terrestrial carbon uptake over India that arises solely due to CO2-fertilization. For this purpose, we use a terrestrial carbon cycle model and consider two extreme scenarios: unlimited $ CO_{2} $-fertilization is allowed for the terrestrial vegetation with $ CO_{2} $ concentration level at 735 ppm in one case, and $ CO_{2} $-fertilization is capped at year 1975 levels for another simulation. Our simulations show that, under equilibrium conditions, modeled carbon stocks in natural potential vegetation increase by 17 Gt-C with unlimited fertilization for $ CO_{2} $ levels and climate change corresponding to the end of 21st century but they decline by 5.5 Gt-C if fertilization is limited at 1975 levels of $ CO_{2} $ concentration. The carbon stock changes are dominated by forests. The area covered by natural potential forests increases by about 36% in the unlimited fertilization case but decreases by 15% in the fertilization-capped case. Thus, the assumption regarding $ CO_{2} $-fertilization has the potential to alter the sign of terrestrial carbon uptake over India. Our model simulations also imply that the maximum potential terrestrial sequestration over India, under equilibrium conditions and best case scenario of unlimited $ CO_{2} $-fertilization, is only 18% of the 21st century SRES A2 scenarios emissions from India. The limited uptake potential of the natural potential vegetation suggests that reduction of $ CO_{2} $ emissions and afforestation programs should be top priorities.
$ CO_{2} $-fertilization and potential future terrestrial carbon uptake in India
Bala, Govindasamy (author) / Gopalakrishnan, Ranjith (author) / Jayaraman, Mathangi (author) / Nemani, Ramakrishna (author) / Ravindranath, N. H. (author)
2010
Article (Journal)
Electronic Resource
English
BKL:
43.47
Globale Umweltprobleme
/
43.47$jGlobale Umweltprobleme
Technical cross-fertilization between terrestrial microgrids and ship power systems
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