HR: 1340h
AN: U43A-0859    [Abstracts]
TI: On the Sensitivity of the Oceanic pCO2 to Recent and Future Climate Induced Changes in Marine Carbon Tracers
AU: * Winguth, A M
EM: awinguth@uta.edu
AF: Dept. of Earth and Environmental Sciences, University of Texas at Arlington, 500 Yates St., Arlington, TX 76019, United States
AU: Groeger, M
EM: mgroeger@ifm-geomar.de
AF: IFM-GEOMAR, Wischhofstr. 1-3, Kiel, 24148, Germany
AU: Maier-Reimer, E
EM: maier-reimer@zmaw.de
AF: Max-Planck-Institute for Meteorology, Bundesstr. 55, Hamburg, 20146, Germany
AU: Mikolajewicz, U
EM: mikolajewicz@zmaw.de
AF: Max-Planck-Institute for Meteorology, Bundesstr. 55, Hamburg, 20146, Germany
AU: Schurgers, G
EM: guy.schurgers@nateko.lu.se
AF: Dept. of Physical Geography and Ecosystems Analysis, Lund University, Sölvegatan 12, Lund, 22362, Sweden
AU: Tjiputra, J
EM: jftjiputra@wisc.edu
AF: Geophysical Institute, University of Bergen, Allegaten 70, Bergen, 5007, Norway
AU: Vizcaino, M
EM: mirenvt@atmos.berkeley.edu
AF: Dept. of Geography, Univeristy of California, Berkeley, 531 McCone Hall, Berkley, CA 94720, United States
AB: A review is given of recent modeling studies with the ocean carbon cycle HAMOCC to evaluate the role of climate- induced changes of the carbon cycle for the oceanic pCO2. Single contributing terms for the total change in pCO2, including the temperature effect and non-temperature effects (DIC, ALK, S), are analyzed. For this purpose, an adjoint carbon cycle model has been developed and applied. Adjoint sensitivities indicate that in the North Atlantic changes in the seasonal pCO2 are predominantly controlled by DIC variations, whereas changes in the North Pacific are correlated about equally to changes in temperature and in DIC. Moreover, the adjoint simulation reveals that the temperature and non-temperature effects are mostly balanced in the equatorial regions, whereas in the Southern Ocean more non-linear processes control the pCO2. The implications of the results will be discussed in respect to past and future climate changes. Specifically, future long-term climate projections with a comprehensive earth system model indicate a significant sensitivity of the change in air-sea Δ pCO2 for the tropics and Southern Ocean to changes in the climate. In the Southern Ocean, these changes are partially linked to non-temperature effects, whereas in the tropics a temperature effect is predominant.
DE: 4215 Climate and interannual variability (1616, 1635, 3305, 3309, 4513)
DE: 4255 Numerical modeling (0545, 0560)
DE: 4260 Ocean data assimilation and reanalysis (3225)
DE: 4273 Physical and biogeochemical interactions
DE: 4806 Carbon cycling (0428)
SC: Union [U]
MN: 2007 Fall Meeting