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Discussion papers
https://doi.org/10.5194/os-2019-30
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-30
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 27 May 2019

Submitted as: research article | 27 May 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Ocean Science (OS).

The Pacific-Indian Ocean Associated Mode in CMIP5 Models

Minghao Yang, Xin Li, Weilai Shi, Chao Zhang, and Jianqi Zhang Minghao Yang et al.
  • College of Meteorology and Oceanography, National University of Defense Technology, Nanjing, 211101, China

Abstract. The Pacific-Indian Ocean associated mode (PIOAM) is the product of the tropical air-sea interaction at the cross-basin scale and the main mode of ocean variation in the tropics. Evaluating the capability of current climate models to simulate the PIOAM and finding the possible factors that affect the simulation results are beneficial to obtain more accurate future climate change prediction. Based on 55-yr the Hadley Centre Global Sea Ice and Sea Surface Temperature (HadISST) reanalysis and the output data from twenty-one Coupled Model Intercomparison Project (CMIP) phase 5 (CMIP5) models, the PIOAM in these CMIP5 models is assessed. It is found that the explained variance of PIOAM in almost all twenty-one CMIP5 models are underestimated. Although all models reproduce the spatial pattern of the positive sea surface temperature anomaly in the eastern equatorial Pacific well, only one-third of these models successfully simulate the ENSO mode with the east-west inverse phase in the Pacific Ocean. In general, CCSM4, GFDL-ESM2M and CMCC-CMS have a stronger capability to capture the PIOAM than that of the other models. The strengths of the PIOAM in the positive phase in less than one-fifth of the models are slightly stronger, and very close to HadISST reanalysis, especially in CCSM4. The interannual variation of PIOAM can be measured by CCSM4, GISS-E2-R and FGOALS-s2. Further analysis indicates that considering the carbon cycle, resolving stratosphere, chemical process or increasing the horizontal resolution of the atmospheric model may effectively improve the performance of the model to simulate the PIOAM.

Minghao Yang et al.
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Minghao Yang et al.
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Short summary
Based on the closed link with ENSO and IOD, the concept of the Pacific-Indian Ocean associated mode (PIOAM) is proposed. When studying the influence of SSTA in the Pacific and Indian oceans on weather and climate, the Pacific and Indian oceans should be considered as unified. Since the PIOAM is so important, how well do current climate models simulate it? The outputs from the climate system models for the CMIP5 were used for this research, from which we aim to provide a more complete evaluation.
Based on the closed link with ENSO and IOD, the concept of the Pacific-Indian Ocean associated...
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