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| Titel |
Simulations of the mid-Pliocene Warm Period using two versions of the NASA/GISS ModelE2-R Coupled Model |
| VerfasserIn |
M. A. Chandler, L. E. Sohl, J. A. Jonas, H. J. Dowsett, M. Kelley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 2 ; Nr. 6, no. 2 (2013-04-24), S.517-531 |
| Datensatznummer |
250017806
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| Publikation (Nr.) |
 copernicus.org/gmd-6-517-2013.pdf |
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| Zusammenfassung |
The mid-Pliocene Warm Period (mPWP) bears many similarities to aspects of
future global warming as projected by the Intergovernmental Panel on Climate
Change (IPCC, 2007). Both marine and terrestrial data point to high-latitude
temperature amplification, including large decreases in sea ice and land
ice, as well as expansion of warmer climate biomes into higher latitudes.
Here we present our most recent simulations of the mid-Pliocene climate
using the CMIP5 version of the NASA/GISS Earth System Model (ModelE2-R). We
describe the substantial impact associated with a recent correction made in
the implementation of the Gent-McWilliams ocean mixing scheme (GM), which
has a large effect on the simulation of ocean surface temperatures,
particularly in the North Atlantic Ocean. The effect of this correction on
the Pliocene climate results would not have been easily determined from
examining its impact on the preindustrial runs alone, a useful demonstration
of how the consequences of code improvements as seen in modern climate
control runs do not necessarily portend the impacts in extreme climates.
Both the GM-corrected and GM-uncorrected simulations were contributed to the
Pliocene Model Intercomparison Project (PlioMIP) Experiment 2. Many findings
presented here corroborate results from other PlioMIP multi-model ensemble
papers, but we also emphasise features in the ModelE2-R simulations that are
unlike the ensemble means. The corrected version yields results that more
closely resemble the ocean core data as well as the PRISM3D reconstructions
of the mid-Pliocene, especially the dramatic warming in the North Atlantic
and Greenland-Iceland-Norwegian Sea, which in the new simulation appears to
be far more realistic than previously found with older versions of the GISS
model. Our belief is that continued development of key physical routines in
the atmospheric model, along with higher resolution and recent corrections
to mixing parameterisations in the ocean model, have led to an Earth System
Model that will produce more accurate projections of future climate. |
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