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| Titel |
Can an Earth System Model simulate better climate change at mid-Holocene than an AOGCM? A comparison study of MIROC-ESM and MIROC3 |
| VerfasserIn |
R. Ohgaito, T. Sueyoshi, A. Abe-Ouchi, T. Hajima, S. Watanabe, H.-J. Kim, A. Yamamoto, M. Kawamiya |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 4 ; Nr. 9, no. 4 (2013-07-19), S.1519-1542 |
| Datensatznummer |
250018090
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| Publikation (Nr.) |
 copernicus.org/cp-9-1519-2013.pdf |
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| Zusammenfassung |
| The importance of evaluating models through paleoclimate simulations is
becoming more recognized in efforts to improve climate projection. To
evaluate an integrated Earth System Model, MIROC-ESM, we performed
simulations in time-slice experiments for the mid-Holocene (6000 yr
before present, 6 ka) and preindustrial (1850 AD, 0 ka) periods under the
protocol of the Coupled Model Intercomparison Project 5/Paleoclimate
Modelling Intercomparison Project 3. We first give an overview of the
simulated global climates by comparing with simulations using a previous
version of the MIROC model (MIROC3), which is an atmosphere–ocean coupled
general circulation model. We then comprehensively discuss various aspects
of climate change with 6 ka forcing and how the differences in the models
can affect the results. We also discuss the representation of the
precipitation enhancement at 6 ka over northern Africa. The precipitation
enhancement at 6 ka over northern Africa according to MIROC-ESM does not
differ greatly from that obtained with MIROC3, which means that newly
developed components such as dynamic vegetation and improvements in the
atmospheric processes do not have significant impacts on the representation
of the 6 ka monsoon change suggested by proxy records. Although there is no
drastic difference between the African monsoon representations of the two
models, there are small but significant differences in the precipitation
enhancement over the Sahara in early summer, which can be related to
the representation of the sea surface temperature rather than the vegetation
coupling in MIROC-ESM. Because the oceanic parts of the two models are
identical, the difference in the sea surface temperature change is
ultimately attributed to the difference in the atmospheric and/or land
modules, and possibly the difference in the representation of low-level
clouds. |
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