Consider the following: on an annual basis, C exchange from photosynthesis is 120 Gt, decomposition is 60 Gt, respiration is 60 Gt, ocean uptake of CO2 is 92 Gt of C, ocean release is 91 Gt of C, release of C to the atmosphere from anthropogenic

sources (fossil fuel use and land use change) is 6 Gt, and the atmosphere is increasing by 3.2 Gt of C. If terrestrial processes are responsible for the remaining C for net balance of the C cycle, then which of the following is likely? A) The terrestrial surface is a net sink of 1.8 Gt of C.
B) The terrestrial surface is a net source of 1.8 Gt of C.
C) The terrestrial surface is a net sink of 2.8 Gt of C.
D) The terrestrial surface is a net source of 2.8 Gt of C.


A

Biology & Microbiology

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a. 1.
b. 4.
c. 8.
d. 17.
e. 21.

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