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Published June 23, 2007 | Published + Supplemental Material
Journal Article Open

New constraints on Northern Hemisphere growing season net flux


Observations of the column-averaged dry molar mixing ratio of CO_2 above both Park Falls, Wisconsin and Kitt Peak, Arizona, together with partial columns derived from aircraft profiles over Eurasia and North America are used to estimate the seasonal integral of net ecosystem exchange (NEE) between the atmosphere and the terrestrial biosphere in the Northern Hemisphere. We find that NEE is ∼25% larger than predicted by the Carnegie Ames Stanford Approach (CASA) model. We show that the estimates of NEE may have been biased low by too weak vertical mixing in the transport models used to infer seasonal changes in Northern Hemisphere CO_2 mass from the surface measurements of CO_2 mixing ratio.

Additional Information

© 2007 American Geophysical Union. Received 5 March 2007; revised 27 April 2007; accepted 1 May 2007; article first published online 23 June 2007. We thank the TransCom 3 modeling community (K. Gurney, M. Prather, T. Maki, L. Bruhwiler, Y. Chen, R. Law, C. Yuen, S. Fan, M. Heimann, and D. Baker) for making the results of their simulations publicly available. This work was supported by a NASA grant NNG05GD07G. N. Y. Krakauer was supported by Graduate Fellowships from both NASA Earth and Space Science and the Betty and Gordon Moore Foundation.

Attached Files

Published - grl23074.pdf

Supplemental Material - grl23074-sup-0001-readme.txt

Supplemental Material - grl23074-sup-0002-ts01.txt

Supplemental Material - grl23074-sup-0003-ts02.txt

Supplemental Material - grl23074-sup-0004-fs01.eps

Supplemental Material - grl23074-sup-0005-fs02.eps

Supplemental Material - grl23074-sup-0006-fs03.eps

Supplemental Material - grl23074-sup-0007-t01.txt

Supplemental Material - grl23074-sup-0008-t02.txt


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