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Problem.png

What is the net land exchange rate for

DJF?

What is the net land exchange rate for JJA?

What is the net annual land exchange rate?


What is the net ocean exchange rate for DJF?

What is the net ocean exchange rate for JJA?

What is the annual net ocean exchange rate?

Problem.png

The table below estimates the global carbon fluxes to and from the land surface and ocean for annual
means and seasonal means (DJF = December, January, February; JJA = June, July, August). Units are in
GtC/year.
Global Flux (GtC/yr)
DJF
JJA
Annual Mean
Land photosynthesis
uptake
90.8
212.3
126.8
Land respiration source 91.1
183.4
123.0
Ocean uptake
100.7
98.8
98.4
Ocean out-gassing
87.8
97.5
96.2
source
Now fill in the following table by calculating the net exchange from the land to
atmosphere and ocean to atmosphere for DJF, JJA and the annual mean. Note that a positive sign
convention means that carbon is going towards the atmosphere. In other words, a negative net flux
indicates that the land/ocean is acting as a carbon SINK and a positive net flux indicates that the
land/ocean is acting as a carbon SOURCE.
Global Flux (GtC/yr)
DJF
JJA
Annual Mean
Net Land
Net Ocean

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A certain amount of carbon flows between the land and the atmosphere and between the sea and the atmosphere and this quantity... View the full answer

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