I am working on a table of data from a chart that appears in the IPCC AR6 WG1 report, Global Carbon and Other Biogeochemical Cycles and Feedbacks-Chapter 5, Figure 5.12 |
Global carbon (CO2) budget (2010–2019) on page 700.
I must admit from the outset that I have not, nor do I intend to, read the entire report. I am, however, searching to see if someone more familiar with Figure 5.12 who can provide a bit more of an explanation of the details presented in Figure 5.12. Also, I am NOT a climate scientist, so apologies in advance if my questions are readily apparent to those more familiar with the science.
Specifically, I would like to understand more about the CO2 fluxes to and from the atmosphere that are nicely summarized toward the top of the chart:
Question 1: The carbon fluxes shown toward the left side, beneath
Net land flux display two values alongside
Gross photosynthesis of
113 (orange) and
29 (red). I assume that
Gross photosynthesis refers to GPP (as opposed to Net primary Production or NPP) but I'm puzzled as to what the
29 (red) refers to. Both the
113 (orange) and
29 (red) point toward the earth indicating carbon flux away from the atmosphere (e.g. reducing carbon in the atmosphere) which I understand happens with Naturally occurring photosynthesis. The
29 (red), however, indicates an anthropogenic activity, purportedly related to
Gross photosynthesis that reduces carbon in the atmosphere. I'm puzzled as to what that
29 (red) may be.
Question 2: Similar to the carbon fluxes shown on the left side, beneath
Net land flux, I'd like to know more about what constitutes the carbon fluxes shown on the right side, beneath
Net ocean flux. Here I am looking for any information on the carbon flux that makes up the
Ocean-atmosphere gas exchange, including the carbon flux toward the atmosphere of
54.6 (orange) and
23 (red) (e.g. increasing carbon in the atmosphere), and the flux away from the atmosphere of
54.0 (orange) and
25.5 (red) (e.g. reducing carbon in the atmosphere).
Excerpts or simply page numbers in the report where I may learn more about the above numbers would be greatly appreciated.