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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.
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| Authors: |
Erickson, D;
Govindasamy, B;
Caldeira, K;
Mirin, A;
Thompson, S L;
Delire, C;
Milovich, J;
Wickett, M
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| Publication Date: | 2004 Apr 06 |
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| OSTI Identifier: | 15013893 |
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| Report Number(s): | UCRL-TR-203417 |
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| DOE Contract Number: | W-7405-ENG-48 |
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| Resource Type: | Technical Report |
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| Research Org: | Lawrence Livermore National Laboratory (LLNL), Livermore, CA |
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| Sponsoring Org: | USDOE |
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| Country of Publication: | United States |
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| Language: | English |
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| Format: | Size: PDF-file: 19 pages; size: 0.4 Mbytes |
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| Other Number(s): | TRN: US200803%%1055 |
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| Subject: | 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; BIOSPHERE; CARBON; CLIMATES; FERTILIZATION; CARBON DIOXIDE |
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| Update Date: | 2008 Feb 28 |
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