| 30—60天大气振荡的全球特征 |
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| 引用本文： | 李崇银.30—60天大气振荡的全球特征[J].大气科学,1991,15(3):66-76. |
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| 作者姓名： | 李崇银 |
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| 作者单位： | LASG中国科学院大气物理研究所 |
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| 摘 要： | 利用ECMWF格点资料,分析研究了大气季节内(30—60天)振荡的全球特征。30—60天振荡动能的分布表明高纬度地区要比赤道地区大得多。说明那里有较突出的30—60天振荡。中高纬度地区的30—60天振荡与热带有明显不同,垂直结构为正压模态,以纬向2—4波为主,多为向酉传播。30—60天振荡存在明显的低频遥相关,北半球主要为欧亚—太平洋(EAP)型和PNA型,南半球主要有澳洲—南非(ASA)型和环南美(RSA)型,并且在全球范围构成南北半球相互衔接的低频波列,即EAP-ASA波列和PNA-RSA波列。南北半球30—60天大气振荡有明显的相互影响,本文研究了南北半球30—60天振荡相互影响的3种主要过程。
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| 关 键 词： | 大气低频遥相关 低频波列 正压模态 |
GLOBAL CHARACTERISTICS OF 30-60 DAY ATMOSPHERIC OSCILLATION |
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| Li Chongyin.GLOBAL CHARACTERISTICS OF 30-60 DAY ATMOSPHERIC OSCILLATION[J].Chinese Journal of Atmospheric Sciences,1991,15(3):66-76. |
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| Authors: | Li Chongyin |
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| Abstract: | The global characteristics of intraseasonal ( 30-60 day ) atmospheric oscillation are investigated by using ECMWF data . The distribution of kinetic energy of the 30 - 60 day oscillation shows it is a very large in the high latitudes. This means the 30-60 day atmospheric oscillation is prominent in the high latitudes as in the tropical atmosphere . The 30 - 60 day oscillations in the middle-high latitudes are clearly different properties with that in the tropical atmosphere . They are barotropical modes for vertical structure , dominated by perturbances of zonal wavenumbers 2 - 4 and propagate slowly westwards. The low - frequency teleconnection is very obvious for the 30 - 60 day oscillation . There are mainly the Europe-Asia-Pacific (EAP) pattern and PNA pattern in the Northern Hemisphere, and the Australia- South Africa ( ASA ) pattern and Round South America ( RSA ) pattern . Especially , above - low - frequency teleconnection patterns link each other in the global atmosphere and constitute two low - frequency wavetrains , i . e . EAP-ASA wavetrain and PNA-RSA wavetrain, or EAP-RSA wavetrain and ASA-PNA-wavetrain. There are obvious interactions of 30-60 day oscillation between the Northern and Southern Hemisphere, and their three fundamental processes are discussed in this paper. |
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| Keywords: | Low - frequency teleconnection Low - frequency wavetrian Barotropical mode |
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