Impact Factor: 3.9

Aug.  2016

Article Contents

# Impacts of Two Types of El Niño on the MJO during Boreal Winter

• The features of the MJO during two types of El Niño events are investigated in this paper using the daily NCEP-2 reanalysis data, OLR data from NOAA, and Real-time Multivariate MJO index for the period 1979-2012. The results indicate that the MJO exhibits distinct features during eastern Pacific (EP) El Niño events, as compared to central Pacific (CP) El Niño events. First, the intensity of the MJO is weakened during EP El Niño winters from the tropical eastern Indian Ocean to the western Pacific, but enhanced during CP El Niño winters. Second, the range of the MJO eastward propagation is different during the two types of El Niño events. During EP El Niño winters, the MJO propagates eastwards to 120°W, but only to 180° during CP El Niño winters. Finally, the frequency in eight phases of the MJO may be affected by the two types of El Niño. Phases 2 and 3 display a stronger MJO frequency during EP El Niño winters, but phases 4 and 5 during CP El Niño winters.

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## Manuscript History

Manuscript received: 17 December 2015
Manuscript revised: 23 March 2016
Manuscript accepted: 12 April 2016
###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

## Impacts of Two Types of El Niño on the MJO during Boreal Winter

• 1. Center for Monsoon and Environment Research/School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou 510275
• 2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
• 3. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301

Abstract: The features of the MJO during two types of El Niño events are investigated in this paper using the daily NCEP-2 reanalysis data, OLR data from NOAA, and Real-time Multivariate MJO index for the period 1979-2012. The results indicate that the MJO exhibits distinct features during eastern Pacific (EP) El Niño events, as compared to central Pacific (CP) El Niño events. First, the intensity of the MJO is weakened during EP El Niño winters from the tropical eastern Indian Ocean to the western Pacific, but enhanced during CP El Niño winters. Second, the range of the MJO eastward propagation is different during the two types of El Niño events. During EP El Niño winters, the MJO propagates eastwards to 120°W, but only to 180° during CP El Niño winters. Finally, the frequency in eight phases of the MJO may be affected by the two types of El Niño. Phases 2 and 3 display a stronger MJO frequency during EP El Niño winters, but phases 4 and 5 during CP El Niño winters.

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