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Volume 10 Issue 3

Jul.  1993

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 1993 >  10(3): 287-295

The Propagation of Disturbances Excited by Low-Frequency Oscillations in the Tropics

  • 1.

    LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080


doi: 10.1007/BF02658134

  • The propagation of disturbances excited by low-frequency oscillations in the tropics is investigated by applying the theory of wave packet dynamics. For simplicity, a linearized barotropic model is adopted and the zonal circulation is taken as basic current. Suppose that the disturbances or waves are superimposed on jet-like westerly basic cur-rent and excited by the forcing in the tropics. We have (1) only the eastward propagating (m>0, n>0 and σ>0) low-frequency disturbances and the stationary (σ = 0) waves can propagate into the middle and high latitudes in the Northern Hemisphere; the others, such as the westward propagating low-frequency wave (m>0, n0) due to the fact that the group velocity of stationary wave is larger; (3) there is a whole wave train excited by the forcing in the tropics and extended into the middle and high latitudes, if the amplitude of the source is independent on time, especially, the low-frequency wave (σ > 0) is of travelling type propagating along the ray; (4) if the source lasts only for an interval of time, namely, its amplitude also has the character of low-frequency oscillation, the excited wave train is not always a whole one, but is restricted in the vicinity of source region in the beginning, extended from the source region to the middle and high latitudes in its saturated stage, after that it gradually becomes weaker and weaker and is detectable only in some area at high latitude, and eventually disappears. Undoubtedly, case (4) is closer to the reality, even though case (3) gives a more impressive wavy pattern.
  • [1] Li Liming, Huang Feng, Chi Dongyan, Liu Shikuo, Wang Zhanggui, 2002: Thermal Effects of the Tibetan Plateau on Rossby Waves from the Diabatic Quasi-Geostrophic Equations of Motion, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 901-913.  doi: 10.1007/s00376-002-0054-4
    [2] Lu Keli, Zhu Yongchun, 1994: Seasonal Variation of Stationary and Low-Frequency Rossby Wave Rays, ADVANCES IN ATMOSPHERIC SCIENCES, 11, 427-435.  doi: 10.1007/BF02658163
    [3] Jiang Guorong, 1996: CISK-related Rossby Waves in the Tropical Atmosphere, ADVANCES IN ATMOSPHERIC SCIENCES, 13, 115-123.  doi: 10.1007/BF02657032
    [4] Lu Peisheng, 1992: The Structure and Propagation of Stationary Planetary Wave Packet in the Barotropic Atmosphere, ADVANCES IN ATMOSPHERIC SCIENCES, 9, 157-166.  doi: 10.1007/BF02657506
    [5] YANG Peicai, WANG Geli, BIAN Jianchun, ZHOU Xiuji, 2010: The Prediction of Non-stationary Climate Series Based on Empirical Mode Decomposition, ADVANCES IN ATMOSPHERIC SCIENCES, 27, 845-854.  doi: 10.1007/s00376-009-9128-x
    [6] Daeun JEONG, Ki-Hong MIN, Gyuwon LEE, and Kyung-Eak KIM, 2014: A Case Study of Mesoscale Convective Band (MCB) Development and Evolution along a Quasi-stationary Front, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 901-915.  doi: 10.1007/s00376-013-3089-9
    [7] Qian Yongfu, Qian Yun, Wang Qianqian, 1994: Numerical Modellings of Properties of the Summer Quasi-Stationary Circulation Systems and Their Monthly Variations, ADVANCES IN ATMOSPHERIC SCIENCES, 11, 399-407.  doi: 10.1007/BF02658159
    [8] Zhu Zhengxin, Cheng Shaopeng, 1988: NUMERICAL EXPERIMENTS ON NH SUBTROPICAL UPPER TROPOSPHERIC QUASI-STATIONARY VORTICES IN SUMMER, ADVANCES IN ATMOSPHERIC SCIENCES, 5, 209-216.  doi: 10.1007/BF02656782
    [9] FuZuntao, Zhao Qiang, QiaoFangli, Liu Shikuo, 2000: Response of Atmospheric Low-frequency Wave to Oceanic Forcing in the Tropics, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 569-575.  doi: 10.1007/s00376-000-0020-y
    [10] Zhang Ren, Yu Zhihao, 2000: Low-Frequency CISK-Rossby Wave and Stratospheric QBO in the Tropical Atmosphere, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 311-321.  doi: 10.1007/s00376-000-0012-y
    [11] HE Jinhai, YU Jingjing, SHEN Xinyong, 2007: Impacts of SST and SST Anomalies on Low-Frequency Oscillation in the Tropical Atmosphere, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 377-382.  doi: 10.1007/s00376-007-0377-2
    [12] Fu Congbin, Ye Duzheng, 1988: THE TROPICAL VERY LOW-FREQUENCY OSCILLATION ON INTERANNUAL SCALE, ADVANCES IN ATMOSPHERIC SCIENCES, 5, 369-388.  doi: 10.1007/BF02656760
    [13] Ren Shuzhan, 1991: New Approach to Study the Evolution of Rossby Wave Packet, ADVANCES IN ATMOSPHERIC SCIENCES, 8, 79-86.  doi: 10.1007/BF02657366
    [14] Huang Ronghui, 1984: THE CHARACTERISTICS OF THE FORCED STATIONARY PLANETARY WAVE PROPAGATIONS IN SUMMER NORTHERN HEMISPHERE, ADVANCES IN ATMOSPHERIC SCIENCES, 1, 84-104.  doi: 10.1007/BF03187619
    [15] Ni Yunqi, Zhang Qin, Lin Wuyin, 1991: Seasonal Characteristics and Interannual Variability of Monthly Scale Low-Frequency Oscillation in a Low-Order Global Spectral Model, ADVANCES IN ATMOSPHERIC SCIENCES, 8, 307-316.  doi: 10.1007/BF02919613
    [16] Chen Longxun, Zhu Congwen, Wang Wen, Zhang Peiqun, 2001: Analysis of the Characteristics of 30-60 Day Low-Frequency Oscillation over Asia during 1998 SCSMEX, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 623-638.  doi: 10.1007/s00376-001-0050-0
    [17] Xu Xiangde, 1991: The Effect of Spatial Structure Character of Heat Source on the Ray Path and the Evolution of Wave Energy of Meridional Wave Train, ADVANCES IN ATMOSPHERIC SCIENCES, 8, 87-98.  doi: 10.1007/BF02657367
    [18] X.L. Wang, H.L. Rui, A. Leetmaa, 1996: The Dynamics of ENSO Anomaly as Revealed in Ensemble Climate Simulations-Impact of Mean Stationary Wave, ADVANCES IN ATMOSPHERIC SCIENCES, 13, 425-444.  doi: 10.1007/BF03342035
    [19] Li Guitong, Li Chongyin, 1998: Activities of Low-Frequency Waves in the Tropical Atmosphere and ENSO, ADVANCES IN ATMOSPHERIC SCIENCES, 15, 193-203.  doi: 10.1007/s00376-998-0039-z
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    • Manuscript History

    Manuscript received: 10 July 1993
    Manuscript revised: 10 July 1993
    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

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    The Propagation of Disturbances Excited by Low-Frequency Oscillations in the Tropics

    • 1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080
    • Manuscript received: 1993-07-10
    • Manuscript revised: 1993-07-10

    Abstract: The propagation of disturbances excited by low-frequency oscillations in the tropics is investigated by applying the theory of wave packet dynamics. For simplicity, a linearized barotropic model is adopted and the zonal circulation is taken as basic current. Suppose that the disturbances or waves are superimposed on jet-like westerly basic cur-rent and excited by the forcing in the tropics. We have (1) only the eastward propagating (m>0, n>0 and σ>0) low-frequency disturbances and the stationary (σ = 0) waves can propagate into the middle and high latitudes in the Northern Hemisphere; the others, such as the westward propagating low-frequency wave (m>0, n0) due to the fact that the group velocity of stationary wave is larger; (3) there is a whole wave train excited by the forcing in the tropics and extended into the middle and high latitudes, if the amplitude of the source is independent on time, especially, the low-frequency wave (σ > 0) is of travelling type propagating along the ray; (4) if the source lasts only for an interval of time, namely, its amplitude also has the character of low-frequency oscillation, the excited wave train is not always a whole one, but is restricted in the vicinity of source region in the beginning, extended from the source region to the middle and high latitudes in its saturated stage, after that it gradually becomes weaker and weaker and is detectable only in some area at high latitude, and eventually disappears. Undoubtedly, case (4) is closer to the reality, even though case (3) gives a more impressive wavy pattern.

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