An Assessment of Indo-Pacific Oceanic Channel Dynamics in the FGOALS-g2 Coupled Climate System Model

• Published in: Advances in atmospheric sciences Vol. 30; no. 4; pp. 997 - 1016
• Main Author: 徐腾飞 袁东亮 俞永强 赵霞
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science Press 01.07.2013; Springer Nature B.V; Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071; University of Chinese Academy of Sciences, Beijing 100049%Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071%State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
• Subjects: Atmospheric Sciences; Climate models; Climate system; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Meteorology; Ocean currents; Ocean temperature; Ocean-atmosphere interaction; Oceans; Sea surface temperature; Surface water; 全球海洋; 次表层海温异常; 气候系统模式; 滞后相关; 热带印度洋; 耦合; 赤道太平洋; 通道; FGOALS-g2; Indonesian Throughflow; Indian Ocean Dipole; ENSO; oceanic channel
• ISSN: 0256-1530; 1861-9533
• DOI: 10.1007/s00376-013-2131-2

Lag correlations of sea surface temperature anomalies （SSTAs）, sea surface height anomalies （SSHAs）, subsurface temperature anomalies, and surface zonal wind anomalies （SZWAs） produced by the Flexible Global Ocean-Atmosphere-Land System modeh Grid-point Version 2 （FGOALS-g2） are analyzed and com- pared with observations. The insignificant, albeit positive, lag correlations between the SSTAs in the south- eastern tropical Indian Ocean （STIO） in fall and the SSTAs in the central-eastern Pacific cold tongue in the following summer through fall are found to be not in agreement with the observational analysis. The model, however, does reproduce the significant lag correlations between tile SSHAs in the STIO in fall and those in the cold tongue at the one-year time lag in the observations. These, along with the significant lag correlations between the SSTAs in the STIO in fall and the subsurface temperature anomalies in the equatorial Pacific vertical section in the following year, suggest that the Indonesian Throughflow plays an important role in propagating the Indian Ocean anomalies into the equatorial Pacific Ocean. Analyses of the interannual anomalies of the Indonesian Throughflow transport suggest that the FGOALS-g2 climate system simulates, but underestimates, the oceanic channel dynamics between the Indian and Pacific Oceans. FGOALS-g2 is shown to produce lag correlations between the SZWAs over the western equatorial Pacific in fall and the cold tongue SSTAs at the one-year time lag that are too strong to be realistic in comparison with observations. The analyses suggest that the atmospheric bridge over the Indo-Pacific Ocean is overestimated in the FGOALS-g2 coupled climate model.