ENSO SIMULATED BY A HYBRID COUPLED OCEAN-ATMOSPHERE MODEL AND ITS MECHANISMS

Wu Aiming; Ni Yunqi

Vol.11, NO.4, 2000

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2000 > 11(4): 419-429

Wu Aiming, Ni Yunqi. Enso simulated by a hybrid coupled ocean-atmosphere model and its mechanisms. J Appl Meteor Sci, 2000, 11(4): 419-429.

Citation:

Wu Aiming, Ni Yunqi. Enso simulated by a hybrid coupled ocean-atmosphere model and its mechanisms. J Appl Meteor Sci, 2000, 11(4): 419-429.

Wu Aiming, Ni Yunqi. Enso simulated by a hybrid coupled ocean-atmosphere model and its mechanisms. J Appl Meteor Sci, 2000, 11(4): 419-429.

Citation:

Wu Aiming, Ni Yunqi. Enso simulated by a hybrid coupled ocean-atmosphere model and its mechanisms. J Appl Meteor Sci, 2000, 11(4): 419-429.

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ENSO SIMULATED BY A HYBRID COUPLED OCEAN-ATMOSPHERE MODEL AND ITS MECHANISMS

Wu Aiming^**,
Ni Yunqi^***

Department of Atmospheric Sciences, Nanjing University, Nanjing 210093

Received Date: 1999-02-08
Rev Recd Date: 1999-11-16
Publish Date: 2000-11-30

Abstract

Abstract

A hybrid coupled ocean-atmosphere model is developed, with which a 45-year simulation is performed. Analysis shows that the model can reproduce ENSO interannual variability over the tropical Pacific. The principal period is about 4 to 5 years. The negative feedback mechanism of ENSO is investigated. The results show that the damping of warm phase can be attributed to the strength ening of the cold water upwelling accompanied with the strong anomalous easterly over the eastern Pacific during the developing period of El Nino and the cold advection along the equator. The damping of cold phase is mainly related to the delaying effects of the equatorial wave reflection.
- Hybrid coupled ocean-atmosphere model;
- Model ENSO;
- Negative feedback mechanism

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References(11)

Figures and Tables

图 1 耦合模式模拟的Niño3指数 (实线, 单位: ℃) 和TW2指数 (经5个月滑动平均, 阴影, 单位: m/s) 随时间的变化

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图 2 TW2指数的功率谱分布

(虚线为95%红噪声水平, 周期T=256/k, k为波数 )

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图 3 第20～39模式年沿赤道的 (5°N～5°S内平均) (a) SSTA (单位: ℃), (b) 海表纬向风异常 (单位: m/s), (c) 沿赤道 (5°N～5°S内平均, 中间图) 及沿10°S (7°N～13°S内平均, 两侧图) 斜温层深度距平 (单位: m) 的时间-经度剖面

(阴影表示正区)

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图 4 位相合成后ENSO8个位相的SSTA水平分布 (单位: ℃) 和海表风应力异常的水平分布

(图a中阴影表示正区, 图b中阴影区表示显著辐合区)

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图 5 位相合成后沿赤道 (5°N～5°S内平均) 的 (a) SSTA (单位: ℃), (b) 垂直速度异常 (单位: cm/s), (c) 沿赤道 (5°N～5°S内平均, 中间图) 及沿10°S (7°N～13°S内平均, 两侧图) 的斜温层深度距平 (单位: m)

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图 6 位相合成后的 (a) SSTA总倾向, (b) 倾向方程中第7项贡献, (c) 倾向方程中第 8项贡献沿赤道 (5°N～5°S内平均, 中间图) 及沿10°S (7°N～13°S内平均, 两侧图) 的位相-经度剖面

(阴影区表示 ≥ 0.05 ℃/月)

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References

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