Global Carbon Sinks and Their Variability Inferred from Atmospheric O 2 and δ 13 C-Reference-Cited by-同舟云学术

Global Carbon Sinks and Their Variability Inferred from Atmospheric O 2 and δ 13 C

Published:2000-03-31 Issue:5462 Volume:287 Page:2467-2470
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Battle M.¹,Bender M. L.¹,Tans P. P.²,White J. W. C.³,Ellis J. T.⁴,Conway T.²,Francey R. J.⁵

Affiliation:

1. Department of Geoscience, Guyot Hall, Princeton University, Princeton, NJ 08544 USA.

2. National Oceanic and Atmospheric Administration/Climate Monitoring and Diagnostics Laboratory, R/E/CG1, 325 Broadway, Boulder, CO 80303 USA.

3. Institute for Arctic and Alpine Research, and Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA.

4. Graduate School of Oceanography, University of Rhode Island, South Ferry Road, Narragansett, RI 02882, USA.

5. Division of Atmospheric Research, Commonwealth Scientific and Industrial Research Organization, Mordialloc, Victoria 3195, Australia.

Abstract

Recent time-series measurements of atmospheric O 2 show that the land biosphere and world oceans annually sequestered 1.4 ± 0.8 and 2.0 ± 0.6 gigatons of carbon, respectively, between mid-1991 and mid-1997. The rapid storage of carbon by the land biosphere from 1991 to 1997 contrasts with the 1980s, when the land biosphere was approximately neutral. Comparison with measurements of δ 13 CO 2 implies an isotopic flux of 89 ± 21 gigatons of carbon per mil per year, in agreement with model- and inventory-based estimates of this flux. Both the δ 13 C and the O 2 data show significant interannual variability in carbon storage over the period of record. The general agreement of the independent estimates from O 2 and δ 13 C is a robust signal of variable carbon uptake by both the land biosphere and the oceans.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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