 |
| Titel |
Modeling the ocean carbon cycle in the Paleocene-Eocene Thermal Maximum with an Earth System Model |
| VerfasserIn |
Mathias Heinze, Tatiana Ilyina |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080149
|
|
|
|
|
|
| Zusammenfassung |
| During the Paleocene-Eocene Thermal Maximum (PETM; Â 55 million years ago) the climate
underwent significant changes within short geological timescales. The atmosphere, ocean and
land system was affected by a massive carbon release which caused an intense global
warming, indicated by a negative δ13C-carbon isotope excursion and carbonate dissolution in
the ocean. In terms of released carbon and concomitant changes in ocean carbon cycle, the
PETM probably serves as the most analogous event in Earth’s history for ongoing
ocean acidification. However the dimensions of the changes in ocean carbon cycle
during the PETM are still uncertain based on the ambiguous amount and time scale
of the carbon release. We use the fully coupled Earth System Model of the Max
Planck Institute for Meteorology (MPI- ESM) which includes ocean and atmospheric
general circulation models (MPI-OM & ECHAM respectively) and models of ocean
biogeochemistry (HAMOCC) and land vegetation (JSBACH). Such modeling system
enables us to simulate the closed carbon cycle in the oceanic, land and atmospheric
compartments. Moreover, by using a three-dimensional ESM we get a more detailed
representation of the ocean biogeochemistry and the underlying physical processes. After
initializing the ocean biogeochemistry within Late Paleocene (pre-PETM) boundary
conditions in an ocean standalone setup, we ran the model into a steady state under 2x
pre-industrial atmospheric CO2 concentrations (560 ppmv). Starting from this
climate state we compute different carbon release scenarios for the onset of the
PETM. Within these model-runs of several 1000 years duration we prescribe a
carbon release of up to 1.5 Gt a-1, which is at the upper limit of estimations for the
PETM. We focus on how ocean biogeochemistry is affected, but also highlight the
interactions between the different compartments of the carbon cycle. First model results
and modifications implemented in HAMOCC for application to the PETM will be
presented. |
|
|
|
|
|
|