| 中国科学院气候系统模式模拟的ENSO循环 |
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| 引用本文： | 苏同华,薛峰,孙泓川,周广庆.中国科学院气候系统模式模拟的ENSO循环[J].海洋学报(英文版),2015,34(1):55-65. |
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| 作者姓名： | 苏同华 薛峰 孙泓川 周广庆 |
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| 作者单位： | 中国科学院大气物理研究所国际气候与环境科学中心, 北京, 100029;福建省气象台, 福州, 350001,中国科学院大气物理研究所国际气候与环境科学中心, 北京, 100029,江苏省气象台, 南京, 210009,中国科学院大气物理研究所国际气候与环境科学中心, 北京, 100029 |
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| 基金项目： | The Strategic Priority Research Program of Chinese Academy of Sciences under contract No. XdA05110201; the National Basic Research Program (973 Program) of China under contract No. 2010CB951901. |
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| 摘 要： | On the basis of more than 200-year control run, the performance of the climate system model of Chinese Academy of Sciences(CAS-ESM-C) in simulating the El Ni?o-Southern Oscillation(ENSO) cycle is evaluated, including the onset, development and decay of the ENSO. It is shown that, the model can reasonably simulate the annual cycle and interannual variability of sea surface temperature(SST) in the tropical Pacific, as well as the seasonal phase-locking of the ENSO. The model also captures two prerequisites for the El Ni?o onset, i.e., a westerly anomaly and a warm SST anomaly in the equatorial western Pacific. Owing to too strong forcing from an extratropical meridional wind, however, the westerly anomaly in this region is largely overestimated. Moreover, the simulated thermocline is much shallower with a weaker slope. As a result, the warm SST anomaly from the western Pacific propagates eastward more quickly, leading to a faster development of an El Ni?o. During the decay stage, owing to a stronger El Ni?o in the model, the secondary Gill-type response of the tropical atmosphere to the eastern Pacific warming is much stronger, thereby resulting in a persistent easterly anomaly in the western Pacific. Meanwhile, a cold anomaly in the warm pool appears as a result of a lifted thermocline via Ekman pumping. Finally, an El Ni?o decays into a La Ni?a through their interactions. In addition, the shorter period and larger amplitude of the ENSO in the model can be attributed to a shallower thermocline in the equatorial Pacific, which speeds up the zonal redistribution of a heat content in the upper ocean.
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| 关 键 词： | climate system model of Chinese Academy of Sciences El Ni?o-Southern Oscillation cycle El Ni?o thermocline wind stress |
| 收稿时间： | 4/7/2014 12:00:00 AM |
| 修稿时间： | 2014/9/10 0:00:00 |
The El Niño-Southern Oscillation cycle simulated by the climate system model of Chinese Academy of Sciences |
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| SU Tonghu,XUE Feng,SUN Hongchuan and ZHOU Guangqing.The El Niño-Southern Oscillation cycle simulated by the climate system model of Chinese Academy of Sciences[J].Acta Oceanologica Sinica,2015,34(1):55-65. |
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| Authors: | SU Tonghu XUE Feng SUN Hongchuan and ZHOU Guangqing |
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| Institution: | 1.International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Fujian Meteorological Observatory, Fuzhou 350001, China2.International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China3.Jiangsu Meteorological Observatory, Nanjing 210009, China |
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| Abstract: | On the basis of more than 200-year control run, the performance of the climate system model of Chinese Academy of Sciences (CAS-ESM-C) in simulating the El Niño-Southern Oscillation (ENSO) cycle is evaluated, including the onset, development and decay of the ENSO. It is shown that, the model can reasonably simulate the annual cycle and interannual variability of sea surface temperature (SST) in the tropical Pacific, as well as the seasonal phase-locking of the ENSO. The model also captures two prerequisites for the El Niño onset, i.e., a westerly anomaly and a warm SST anomaly in the equatorial western Pacific. Owing to too strong forcing from an extratropical meridional wind, however, the westerly anomaly in this region is largely overestimated. Moreover, the simulated thermocline is much shallower with a weaker slope. As a result, the warm SST anomaly from the western Pacific propagates eastward more quickly, leading to a faster development of an El Niño. during the decay stage, owing to a stronger El Niño in the model, the secondary Gill-type response of the tropical atmosphere to the eastern Pacific warming is much stronger, thereby resulting in a persistent easterly anomaly in the western Pacific. Meanwhile, a cold anomaly in the warm pool appears as a result of a lifted thermocline via Ekman pumping. Finally, an El Niño decays into a La Niña through their interactions. In addition, the shorter period and larger amplitude of the ENSO in the model can be attributed to a shallower thermocline in the equatorial Pacific, which speeds up the zonal redistribution of a heat content in the upper ocean. |
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| Keywords: | climate system model of Chinese Academy of Sciences El Niñ o-Southern Oscillation cycle El Niñ o thermocline wind stress |
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