Abstract
The current narrative of artificial upwelling (AU) is to use ocean pipes
to pump nutrient rich deep water to the ocean surface, thereby
stimulating the biological carbon pump. This simplistic concept of AU
does not take the response of the solubility pump or the
CO2 emission scenario into account. Using global
ocean-atmosphere model experiments and several idealized model tracers
we show that the effectiveness of almost globally applied AU from the
year 2020 to 2100 to draw down CO2 from the atmosphere
is strongly dependent on the CO2 emission scenario and
ranges from 1.01 Pg C / year under RCP 8.5 to 0.32 Pg C / year under RCP
2.6. The solubility pump becomes equally effective compared to the
biological carbon pump under the highest emission scenario (RCP 8.5),
but responds with CO2 outgassing under low
CO2emission scenarios.