Tropical Pacific interactions in the WCRP-CMIP3 multi-model dataset

Meteorological applications

article

Ana Laura Berman¹  Gabriel Silvestri² 

[1] Universidad de Buenos Aires;Unidad Mixta Internacional: Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos/Centre National de la Recherche Scientifique (UMI: IFAECI/CNRS)

关键词: sea surface temperature;    tropical Pacific;    global climate models;    oceanic interactions;    Wavelet Coherence analysis;   

DOI  :  10.1002/met.300

学科分类：社会科学、人文和艺术（综合）

来源: Wiley

【 摘 要 】

The ability of numerical models in reproducing the observed statistical links between the sea surface temperature of central and eastern tropical Pacific Ocean is analysed in this paper. Significant links in the whole spectrum of frequency were studied for models of the World Climate Research Program (WCRP-CMIP3/IPCC-AR4) using the methodology of wavelet coherence. During the second half of the twentieth century, in-phase or quasi-in-phase links in oscillations of 2–6 years, a lack of relation in oscillations of 8–12 years and time lagged links in the longest periodicities are detected in the observed dataset. Some of the analysed models are able to reproduce the observed relationships in oscillations shorter than 6 years and few of them also reproduce the lacks of significant relation in the band of 8–12 years. On the other hand, all models have serious problems representing the observed time lagged links in the longest waves. The analysis shows that climate models are still unable to reproduce specific features of tropical Pacific interactions with potential effect on the Southern Hemisphere atmospheric circulation and, in particular, the South American climatic variability.

【 授权许可】

CC BY|CC BY-NC|CC BY-NC-ND