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| Titel |
Evaluation of the eastern equatorial Pacific SST seasonal cycle in CMIP5 models |
| VerfasserIn |
Z. Y. Song, H. L. Liu, C. Z. Wang, L. P. Zhang, F. L. Qiao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 5 ; Nr. 10, no. 5 (2014-10-23), S.837-843 |
| Datensatznummer |
250117070
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| Publikation (Nr.) |
 copernicus.org/os-10-837-2014.pdf |
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| Zusammenfassung |
| The annual cycle of sea surface temperature (SST) in the eastern equatorial
Pacific (EEP) has the largest amplitude in the tropical oceans, but it is
poorly represented in the coupled general circulation models (CGCMs) of the
Coupled Model Intercomparison Project Phase 3 (CMIP3). In this study, 18
models from CMIP5 are evaluated in terms of their capability of simulating
the SST annual cycle in the EEP. Fourteen models are able to simulate the
annual cycle fairly well, which suggests that the performances of CGCMs have
been improved. The results of multi-model ensemble (MME) mean show that CMIP5
CGCMs can capture the annual cycle signal in the EEP with a correlation
coefficient up to 0.9. Moreover, the CMIP5 models can simulate the westward
propagation character of the EEP SST – in particular, EEP region 1 (EP1)
near the eastern coast leading EEP region 2 (EP2) near the central equatorial
Pacific by 1 to 2 months in spring. However, the models fail to reproduce the
in-phase SST relationship between EP1 and EP2 in August and September. For
amplitude simulations, the model SST in EP1 shows weaker seasonal variation
than the observations due to the large warm SST biases from the southeastern
tropical Pacific in the boreal autumn. In EP2, the simulated SST amplitudes
are nearly the same as the observations while there is the presence of a
quasi-constant cold bias associated with poor cold tongue simulation in the
CGCMs. To improve CGCM simulation of a realistic SST seasonal cycle, local
and remote SST biases that exist in both CMIP3 and CMIP5 CGCMs must be
resolved at least for simulating the SSTs in the central equatorial Pacific
and the southeastern tropical Pacific. |
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