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Boreal forests and atmosphere - Biosphere exchange of carbon dioxideTwo approaches to investigating the role of boreal forests in the global carbon cycle are presented. First, a tracer support model which incorporates the normalized-difference vegetation index obtained from advanced, very high resolution radiometer radiances was used to simulate the annual cycle of CO2 in the atmosphere. Results indicate that the seasonal growth of the combined boreal forests of North America and Eurasia accounts for about 50 percent of the mean seasonal CO2 amplitude recorded at Pt. Barrow, Alaska and about 30 percent of the more globally representative CO2 signal at Mauna Loa, Hawaii. Second, tree-ring width data from four boreal treeline sites in northern Canada were positively correlated with Pt. Barrow CO2 drawdown for the period 1971-1982. These results suggest that large-scale changes in the growth of boreal forests may be contributing to the observed increasing trend in CO2 amplitude. They further suggest that tree-ring data may be applicable as indices for CO2 uptake and remote sensing estimates of photosynthetic activity.
Document ID
19880026805
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
D'Arrigo, Rosanne (Lamont-Doherty Geological Observatory Palisades, NY, United States)
Jacoby, Gordon C. (Lamont-Doherty Geological Observatory Palisades, NY, United States)
Fung, Inez Y. (NASA Goddard Institute for Space Studies New York, United States)
Date Acquired
August 13, 2013
Publication Date
September 24, 1987
Publication Information
Publication: Nature
Volume: 329
ISSN: 0028-0836
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other