Abstract
The recent proposals to estimate the oceanic uptake of CO{sub 2} by monitoring the oceanic change in {sup 13}C/{sup 12}C isotope ratio or the air-sea {sup 13}C/{sup 12}C isotopic disequilibrium is reviewed. Because the history of atmospheric CO{sub 2} and {sup 13}CO{sub 2} since preindustrial times is almost the same, the oceanic penetration depth of both tracers must be the same. This dynamic constraint permits the establishment of yet a third method to estimate the global ocean uptake of CO{sub 2} from {sup 13}C measurements. Using available observations in conjunction with canonical values for the global carbon cycle parameters the three methods yield inconsistent oceanic CO{sub 2} uptake rates for the time period 1970-1990, ranging from 0 to over 3 GtC year{sup -1}. However, uncertainties in the available carbon cycle data must be taken into account. Using a non-linear estimation procedure, a consistent scenario with an oceanic CO{sub 2} uptake rate of 2.2{+-}0.8 GtC year{sup -1} can be established. The method also permits an investigation of the sensitivities of the different approaches. An analysis of the results of two three-dimensional simulations with the Hamburg Model of the Oceanic Carbon Cycle shows that the {sup 13}C isotope indeed tracks the oceanic
More>>
Citation Formats
Heimann, M, and Maier-Reimer, E.
On the relations between the oceanic uptake of CO{sub 2} and its carbon isotopes.
Germany: N. p.,
1994.
Web.
Heimann, M, & Maier-Reimer, E.
On the relations between the oceanic uptake of CO{sub 2} and its carbon isotopes.
Germany.
Heimann, M, and Maier-Reimer, E.
1994.
"On the relations between the oceanic uptake of CO{sub 2} and its carbon isotopes."
Germany.
@misc{etde_10125518,
title = {On the relations between the oceanic uptake of CO{sub 2} and its carbon isotopes}
author = {Heimann, M, and Maier-Reimer, E}
abstractNote = {The recent proposals to estimate the oceanic uptake of CO{sub 2} by monitoring the oceanic change in {sup 13}C/{sup 12}C isotope ratio or the air-sea {sup 13}C/{sup 12}C isotopic disequilibrium is reviewed. Because the history of atmospheric CO{sub 2} and {sup 13}CO{sub 2} since preindustrial times is almost the same, the oceanic penetration depth of both tracers must be the same. This dynamic constraint permits the establishment of yet a third method to estimate the global ocean uptake of CO{sub 2} from {sup 13}C measurements. Using available observations in conjunction with canonical values for the global carbon cycle parameters the three methods yield inconsistent oceanic CO{sub 2} uptake rates for the time period 1970-1990, ranging from 0 to over 3 GtC year{sup -1}. However, uncertainties in the available carbon cycle data must be taken into account. Using a non-linear estimation procedure, a consistent scenario with an oceanic CO{sub 2} uptake rate of 2.2{+-}0.8 GtC year{sup -1} can be established. The method also permits an investigation of the sensitivities of the different approaches. An analysis of the results of two three-dimensional simulations with the Hamburg Model of the Oceanic Carbon Cycle shows that the {sup 13}C isotope indeed tracks the oceanic penetration of anthropogenic CO{sub 2}. Because of its different time history, bomb produced radiocarbon, as measured at the time of GEOSECS, correlates much less well to excess carbon. (orig.)}
place = {Germany}
year = {1994}
month = {Nov}
}
title = {On the relations between the oceanic uptake of CO{sub 2} and its carbon isotopes}
author = {Heimann, M, and Maier-Reimer, E}
abstractNote = {The recent proposals to estimate the oceanic uptake of CO{sub 2} by monitoring the oceanic change in {sup 13}C/{sup 12}C isotope ratio or the air-sea {sup 13}C/{sup 12}C isotopic disequilibrium is reviewed. Because the history of atmospheric CO{sub 2} and {sup 13}CO{sub 2} since preindustrial times is almost the same, the oceanic penetration depth of both tracers must be the same. This dynamic constraint permits the establishment of yet a third method to estimate the global ocean uptake of CO{sub 2} from {sup 13}C measurements. Using available observations in conjunction with canonical values for the global carbon cycle parameters the three methods yield inconsistent oceanic CO{sub 2} uptake rates for the time period 1970-1990, ranging from 0 to over 3 GtC year{sup -1}. However, uncertainties in the available carbon cycle data must be taken into account. Using a non-linear estimation procedure, a consistent scenario with an oceanic CO{sub 2} uptake rate of 2.2{+-}0.8 GtC year{sup -1} can be established. The method also permits an investigation of the sensitivities of the different approaches. An analysis of the results of two three-dimensional simulations with the Hamburg Model of the Oceanic Carbon Cycle shows that the {sup 13}C isotope indeed tracks the oceanic penetration of anthropogenic CO{sub 2}. Because of its different time history, bomb produced radiocarbon, as measured at the time of GEOSECS, correlates much less well to excess carbon. (orig.)}
place = {Germany}
year = {1994}
month = {Nov}
}