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Volume 13 Issue 1

Jan.  1996

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 1996 >  13(1): 124-132

Internal Gravity Waves Generated by a Local Thermal Source in an Irrotational Zonal-Vertical Plane: Numerical Analysis

  • 1.

    Center for Environmental Sciences, Peking University, Beijing 100871,Institute for Hydrospheric-Atmospheric Sciences, Nagoya 464-01, Japan,Geophysics Department, Peking University, Beijing 100871


doi: 10.1007/BF02657033

  • The vertical and horizontal propagation of internal gravity waves forced by a local thermal source at the lower boundary is examined using the irrotational two-dimensional model developed by Zhang et al. (1995). The source generates waves with the same absolute frequency 1 / 15 d-1 but different wavenumber. Internal gravity waves with wide spreading frequencies and wavenumbers appear due to wave-wave interactions. The foreced waves 1W (west-ward-propagating with wavenumber 1) and IE (eastward-propagating with wavenumber 1), whose absolute phase speeds are 31 m s-1, are predominant. Other forced waves with smaller phase speeds are relatively weaker. These waves interact with the zonal mean flow, causing the flow to alternate with easterly and westerly with a 32-month pe-riod. The absolute maximum wind speeds of easterly and westerly are 35 m s-1 which is larger than the largest phase speed of forced waves. The forced waves IE and 1W may accelerate easterly and westerly up to 31 m s-1, respectively. The excessive accelerations are due to the self-acceleration of waves IE and 1W or newly generated high frequency waves IE and 1W The horizontal propagation of the waves are mainly affected by the forcing and wave-low interactions which lead to fast-slow variations of wave phase speed and amplitude.
  • [1] 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
    [2] GAO Shouting, TAN Zhemin, ZHAO Sixiong, LUO Zhexian, LU Hancheng, WANG Donghai, CUI Chunguang, CUI Xiaopeng, SUN Jianhua, 2015: Mesoscale Dynamics and Its Application in Torrential Rainfall Systems in China, ADVANCES IN ATMOSPHERIC SCIENCES, 32, 192-205.  doi: 10.1007/s00376-014-0005-x
    [3] Zhang Daizhou, Qin Yu, 1995: QBO-like Oscillations Induced by Local Thermal Forcing, ADVANCES IN ATMOSPHERIC SCIENCES, 12, 245-254.  doi: 10.1007/BF02656837
    [4] Hengyi WENG, 2003: Impact of the 11-yr Solar Activity on the QBO in the Climate System, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 303-309.  doi: 10.1007/s00376-003-0017-4
    [5] CHEN Wen, WEI Ke, 2009: Interannual Variability of the Winter Stratospheric Polar Vortex in the Northern Hemisphere and their Relations to QBO and ENSO, ADVANCES IN ATMOSPHERIC SCIENCES, 26, 855-863.  doi: 10.1007/s00376-009-8168-6
    [6] Zou Han, Ji Chongping, Zhou Libo, 2000: QBO Signal in Total Ozone over Tibet, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 562-568.  doi: 10.1007/s00376-000-0019-4
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    [8] Gao Shouting, Liu Kunru, 1990: Introduction of the Direct Method by Illustrating Schr?dinger Equation and Its Application to Wave-Wave Striking Interaction, ADVANCES IN ATMOSPHERIC SCIENCES, 7, 186-191.  doi: 10.1007/BF02919156
    [9] Zeng Qingcun, Zhang Minghua, 2000: Wave-Mean Flow Interaction: the Role of Continuous-Spectrum Disturbances, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 1-17.  doi: 10.1007/s00376-000-0039-0
    [10] Bian Jianchun, Chen Hongbin, Zhao Yanliang, Lü Daren, 2002: Variation Features of Total Atmospheric Ozone in Beijing and Kunming Based on Dobson and TOMS Data, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 279-286.  doi: 10.1007/s00376-002-0022-z
    [11] A.B. Sikder, S.K. Patwardhan, H.N. Bhalme, 1993: Tropical Stratospheric Circulation and Monsoon Rainfall, ADVANCES IN ATMOSPHERIC SCIENCES, 10, 379-385.  doi: 10.1007/BF02658143
    [12] Luo Dehai, 1999: Nonlinear Three-Wave Interaction among Barotropic Rossby Waves in a Large-scale Forced Barotropic Flow, ADVANCES IN ATMOSPHERIC SCIENCES, 16, 451-466.  doi: 10.1007/s00376-999-0023-2
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    • Manuscript History

    Manuscript received: 10 January 1996
    Manuscript revised: 10 January 1996
    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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    Internal Gravity Waves Generated by a Local Thermal Source in an Irrotational Zonal-Vertical Plane: Numerical Analysis

    • 1. Center for Environmental Sciences, Peking University, Beijing 100871,Institute for Hydrospheric-Atmospheric Sciences, Nagoya 464-01, Japan,Geophysics Department, Peking University, Beijing 100871
    • Manuscript received: 1996-01-10
    • Manuscript revised: 1996-01-10

    Abstract: The vertical and horizontal propagation of internal gravity waves forced by a local thermal source at the lower boundary is examined using the irrotational two-dimensional model developed by Zhang et al. (1995). The source generates waves with the same absolute frequency 1 / 15 d-1 but different wavenumber. Internal gravity waves with wide spreading frequencies and wavenumbers appear due to wave-wave interactions. The foreced waves 1W (west-ward-propagating with wavenumber 1) and IE (eastward-propagating with wavenumber 1), whose absolute phase speeds are 31 m s-1, are predominant. Other forced waves with smaller phase speeds are relatively weaker. These waves interact with the zonal mean flow, causing the flow to alternate with easterly and westerly with a 32-month pe-riod. The absolute maximum wind speeds of easterly and westerly are 35 m s-1 which is larger than the largest phase speed of forced waves. The forced waves IE and 1W may accelerate easterly and westerly up to 31 m s-1, respectively. The excessive accelerations are due to the self-acceleration of waves IE and 1W or newly generated high frequency waves IE and 1W The horizontal propagation of the waves are mainly affected by the forcing and wave-low interactions which lead to fast-slow variations of wave phase speed and amplitude.

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