| MODULATION OF MADDEN-JULIAN OSCILLATION ON TIBETAN PLATEAU VORTEX |
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| 作者姓名： | 赵福虎 李国平 黄楚惠 刘晓冉 |
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| 作者单位： | Chongqing Meteorological Observatory, Chongqing 401147 China; College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225 China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanj |
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| 摘 要： | This study uses NCEP/NCAR daily reanalysis data, NOAA outgoing long-wave radiation (OLR) data, the real-time multivariate MJO (RMM) index from the Australian Bureau of Meteorology and Tibetan Plateau vortex (TPV) data from the Chengdu Institute of Plateau Meteorology to discuss modulation of the Madden-Julian Oscillation (MJO) on the Tibetan Plateau Vortex (TPV). Wavelet and composite analysis are used. Results show that the MJO plays an important role in the occurrence of the TPV that the number of TPVs generated within an active period of the MJO is three times as much as that during an inactive period. In addition, during the active period, the number of the TPVs generated in phases 1 and 2 is larger than that in phases 3 and 7. After compositing phases 1 and 7 separately, all meteorological elements in phase 1 are apparently conducive to the generation of the TPV, whereas those in phase 7 are somewhat constrained. With its eastward propagation process, the MJO convection centre spreads eastward, and the vertical circulation within the tropical atmosphere changes. Due to the interaction between the mid-latitude and low-latitude atmosphere, changes occur in the baroclinic characteristics of the atmosphere, the available potential energy and eddy available potential energy of the atmosphere, and the circulation structures of the atmosphere over the Tibetan Plateau (TP) and surrounding areas. This results in significantly different water vapour transportation and latent heat distribution. Advantageous and disadvantageous conditions therefore alternate, leading to a significant difference among the numbers of plateau vortex in different phases.
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| 关 键 词： | modulation wavelet analysis composite analysis low-frequency oscillation Tibetan Plateau vortex real-time multivariate MJO index |
| 修稿时间： | 2015/9/29 0:00:00 |
MODULATION OF MADDEN-JULIAN OSCILLATION ON TIBETAN PLATEAU VORTEX |
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| ZHAO Fu-hu,LI Guo-ping,HUANG Chu-hui and LIU Xiao-ran.MODULATION OF MADDEN-JULIAN OSCILLATION ON TIBETAN PLATEAU VORTEX[J].Journal of Tropical Meteorology,2016,22(1):30-41. |
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| Authors: | ZHAO Fu-hu LI Guo-ping HUANG Chu-hui and LIU Xiao-ran |
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| Institution: | Chongqing Meteorological Observatory, Chongqing 401147 China; College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225 China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanj |
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| Abstract: | This study uses NCEP/NCAR daily reanalysis data, NOAA outgoing long-wave radiation (OLR) data, the real-time multivariate MJO (RMM) index from the Australian Bureau of Meteorology and Tibetan Plateau vortex (TPV) data from the Chengdu Institute of Plateau Meteorology to discuss modulation of the Madden-Julian Oscillation (MJO) on the Tibetan Plateau Vortex (TPV). Wavelet and composite analysis are used. Results show that the MJO plays an important role in the occurrence of the TPV that the number of TPVs generated within an active period of the MJO is three times as much as that during an inactive period. In addition, during the active period, the number of the TPVs generated in phases 1 and 2 is larger than that in phases 3 and 7. After compositing phases 1 and 7 separately, all meteorological elements in phase 1 are apparently conducive to the generation of the TPV, whereas those in phase 7 are somewhat constrained. With its eastward propagation process, the MJO convection centre spreads eastward, and the vertical circulation within the tropical atmosphere changes. Due to the interaction between the mid-latitude and low-latitude atmosphere, changes occur in the baroclinic characteristics of the atmosphere, the available potential energy and eddy available potential energy of the atmosphere, and the circulation structures of the atmosphere over the Tibetan Plateau (TP) and surrounding areas. This results in significantly different water vapour transportation and latent heat distribution. Advantageous and disadvantageous conditions therefore alternate, leading to a significant difference among the numbers of plateau vortex in different phases. |
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| Keywords: | modulation wavelet analysis composite analysis low-frequency oscillation Tibetan Plateau vortex real-time multivariate MJO index |
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