What is the mean amount (in grams) of dissolved carbon in a ton of sea water?

Question

What is the mean amount (in grams) of dissolved carbon in a ton of sea water ?

1. The value I want is the concentration value in say the first two metres of surface water (A distribution of this concentration by depth would also help)
2. If I take say the 10% surface area where the CO₂ concentration is the highest on the globe, what does it change about the result ?

Please feel free to answer even if your answer is not the complete one but just part of it. Thanks

Answer 1

This graph at Wikipedia/Wikimedia is part of the answer :

source:

• en.wikipedia.org/wiki/Oceanic_carbon_cycle#/media/File:WOA05_GLODAP_pd_DIC_AYool.png
• en.wikipedia.org/wiki/File:WOA05_GLODAP_pd_DIC_AYool.png

2.15 mol/m³ at the surface in 1990 seems like a approximative value, which makes approximately 27 g.

Now, the two questions left are:

• How did this value evolve since 1990?
• Does this concentration change a lot with depth?