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Published online on December 11, 2001, 10.1073/pnas.261555198

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Geophysics
 A large carbon sink in the woody biomass of Northern forests

R. B. Myneni*,dagger ,Dagger , J. Dong*,dagger , C. J. Tucker§, R. K. Kaufmann*, P. E. Kauppi,||, J. Liski**,dagger dagger , L. Zhou*, V. AlexeyevDagger Dagger , and M. K. Hughes§§

* Department of Geography, Boston University, 675 Commonwealth Avenue, Boston, MA 02215; § National Aeronautics and Space Administration Goddard Space Flight Center, Code 923, Greenbelt, MD 20771; Departments of  Limnology and Environmental Protection and ** Forest and Ecology, University of Helsinki, P.O. Box 27, FIN-00014 Helsinki, Finland; || Forest Section, International Institute for Applied System Analysis, A-2361, Laxenburg, Austria; dagger dagger  European Forest Institute, Torikatu 34, FIN-80100 Joensuu, Finland; Dagger Dagger  Saint-Petersburg Forest Ecological Center, 21 Instituskii Avenue, St. Petersburg, 194021 Russia; and §§ Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721

Communicated by Charles D. Keeling, University of California at San Diego, La Jolla, CA, October 17, 2001 (received for review February 19, 2001)

The terrestrial carbon sink, as of yet unidentified, represents 15-30% of annual global emissions of carbon from fossil fuels and industrial activities. Some of the missing carbon is sequestered in vegetation biomass and, under the Kyoto Protocol of the United Nations Framework Convention on Climate Change, industrialized nations can use certain forest biomass sinks to meet their greenhouse gas emissions reduction commitments. Therefore, we analyzed 19 years of data from remote-sensing spacecraft and forest inventories to identify the size and location of such sinks. The results, which cover the years 1981-1999, reveal a picture of biomass carbon gains in Eurasian boreal and North American temperate forests and losses in some Canadian boreal forests. For the 1.42 billion hectares of Northern forests, roughly above the 30th parallel, we estimate the biomass sink to be 0.68 ± 0.34 billion tons carbon per year, of which nearly 70% is in Eurasia, in proportion to its forest area and in disproportion to its biomass carbon pool. The relatively high spatial resolution of these estimates permits direct validation with ground data and contributes to a monitoring program of forest biomass sinks under the Kyoto protocol.

dagger R.B.M. and J.D. contributed equally to this work.

Dagger To whom reprint requests should be addressed. E-mail: rmyneni{at}bu.edu.

www.pnas.org/cgi/doi/10.1073/pnas.261555198
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