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| Titel |
Simulating the mid-Pliocene Warm Period with the CCSM4 model |
| VerfasserIn |
N. A. Rosenbloom, B. L. Otto-Bliesner, E. C. Brady, P. J. Lawrence |
| 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 (2013-04-26), S.549-561 |
| Datensatznummer |
250017808
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| Publikation (Nr.) |
 copernicus.org/gmd-6-549-2013.pdf |
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| Zusammenfassung |
| This paper describes the experimental design and model results from a 500 yr
fully coupled Community Climate System, version 4, simulation of the
mid-Pliocene Warm Period (mPWP) (ca. 3.3–3.0 Ma). We simulate the mPWP
using the "alternate" protocol prescribed by the Pliocene Model
Intercomparison Project (PlioMIP) for the AOGCM simulation (Experiment 2).
Results from the CCSM4 mPWP simulation show a 1.9 °C increase in
global mean annual temperature compared to the 1850 preindustrial control,
with a polar amplification of ~3 times the global warming. Global
precipitation increases slightly by 0.09 mm day−1 and the monsoon
rainfall is enhanced, particularly in the Northern Hemisphere (NH). Areal sea
ice extent decreases in both hemispheres but persists through the summers.
The model simulates a relaxation of the zonal sea surface temperature (SST)
gradient in the tropical Pacific, with the El Niño–Southern Oscillation
(Niño3.4) ~20% weaker than the preindustrial and exhibiting
extended periods of quiescence of up to 150 yr. The maximum Atlantic
meridional overturning circulation and northward Atlantic oceanic heat
transport are indistinguishable from the control. As compared to PRISM3,
CCSM4 overestimates Southern Hemisphere (SH) sea surface temperatures, but
underestimates NH warming, particularly in the North Atlantic, suggesting
that an increase in northward ocean heat transport would bring CCSM4 SSTs
into better alignment with proxy data. |
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