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Chapter 2: The North American Carbon Budget: Past, Present, and Future
Pages 33-38

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From page 33...
... ; - the goals and objectives should be explicitly described; - critical content areas missing from the chapter are interannual variability of carbon fluxes and impacts of severe and extended droughts; - indicators and feedbacks are missing from Section 2.4; - consistent use of units is recommended; - numbers with 3-4 significant digits over-state the confidence the reader should have, and all numbers should include uncertainties. And one broader concern to note: This chapter follows the global overview in Chapter 1, where "sinks" are sinks in the cycle perturbed by anthropogenic CO2 and CH4, and the assumption is that globally, the net unperturbed background sinks are zero summed across all reservoirs.
From page 34...
... For part of the Introduction and the Historical Context section, it is appropriate to cite some older but classical studies (e.g., Caspersen et al., 2000; Goodale et al., 2002, etc) for the historical context of the North American carbon cycle studies.
From page 35...
... - Section 2.4 should also discuss the interannual variability of carbon fluxes besides indicators and feedbacks. - Section 2.5.2 should quantitatively describe the regional carbon sinks, fossil fuel emissions, and the percentage of fossil fuels emissions are offset by ecosystem carbon uptake.
From page 36...
... P72, Line 21 The focus here should not be North American carbon balance, but North American carbon sink, or the carbon sequestration capacity of North American ecosystems. P72, Line 23-25 Since this statement is put in the historical context, it is better to cite some older and classical studies (e.g., Caspersen et al., 2000; Goodale et al., 2002)
From page 37...
... . They can indicate trends in photosynthetic activity or gross primary productivity, but not net carbon uptake.
From page 38...
... P88, Line 15-19 These sentences clearly indicate that there is large interannual variability in ecosystem carbon fluxes, which contradicts Key Finding 4 (that the magnitude of the terrestrial carbon sink has persisted at a similar magnitude over time)

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