Trends and regional distributions of land and ocean carbon sinks

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Author(s) Sarmiento, J.L., Gloor, M., Gruber, N., Beaulieu, C., Jacobson, A.R., Fletcher, S.E. Mikaloff, Pacala, S., Rodgers, K.
Publication Type Journal Items, Publication Status: Published
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Title Trends and regional distributions of land and ocean carbon sinks
Author(s) Sarmiento, J.L.
Gloor, M.
Gruber, N.
Beaulieu, C.
Jacobson, A.R.
Fletcher, S.E. Mikaloff
Pacala, S.
Rodgers, K.
Journal or Series Title Biogeosciences
Volume Number 7
Issue Number 8
Start Page 2351
End Page 2367
ISSN 1726-4189
Publisher Copernicus
Publication Place Katlenburg-Lindau
Publication Date 2010
Abstract We show here an updated estimate of the net land carbon sink (NLS) as a function of time from 1960 to 2007 calculated from the difference between fossil fuel emissions, the observed atmospheric growth rate, and the ocean uptake obtained by recent ocean model simulations forced with reanalysis wind stress and heat and water fluxes. Except for interannual variability, the net land carbon sink appears to have been relatively constant at a mean value of -0.27 Pg C yr(-1) between 1960 and 1988, at which time it increased abruptly by -0.88 (-0.77 to -1.04) Pg C yr(-1) to a new relatively constant mean of -1.15 Pg C yr(-1) between 1989 and 2003/7 (the sign convention is negative out of the atmosphere). This result is detectable at the 99% level using a t-test. The land use source (LU) is relatively constant over this entire time interval. While the LU estimate is highly uncertain, this does imply that most of the change in the net land carbon sink must be due to an abrupt increase in the land sink, LS = NLS - LU, in response to some as yet unknown combination of biogeochemical and climate forcing. A regional synthesis and assessment of the land carbon sources and sinks over the post 1988/1989 period reveals broad agreement that the Northern Hemisphere land is a major sink of atmospheric CO2, but there remain major discrepancies with regard to the sign and magnitude of the net flux to and from tropical land.
DOI 10.5194/bg-7-2351-2010
Additional Notes Received 30 October 2009, Published in Biogeosciences Discuss. 12 November 2009, Revised 5 July 2010, Accepted 12 July 2010, Published 6 August 2010
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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  author = "Sarmiento, J.L. and Gloor, M. and Gruber, N. and Beaulieu, C. and Jacobson, A.R. and Fletcher, S.E. Mikaloff and Pacala, S. and Rodgers, K.",
  title = "{T}rends and regional distributions of land and ocean carbon sinks",
  journal = "Biogeosciences",
  year = 2010,
  volume = "7",
  number = "8",
  pages = "2351--2367",

E-Citations record created: Mon, 20 Sep 2010, 06:18:39 CET