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Volume 19 Issue 2

Mar.  2002

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2002 >  19(2): 266-278

Wind Structure in an Intermediate Boundary Layer Model Based on Ekman Momentum Approximation

  • 1.

    Key Laboratory of Meso-Scale Severe Weather/ MOE, Department of Atmospheric Sciences. Nanjing University, Nanjing 210093,Key Laboratory of Meso-Scale Severe Weather/ MOE, Department of Atmospheric Sciences. Nanjing University, Nanjing 210093


doi: 10.1007/s00376-002-0021-0

  • A quasi three-dimensional, intermediate planetary boundary layer (PBL) model is developed by including inertial acceleration with the Ekman momentum approximation, but a nonlinear eddy viscosity (1993). The model could keep the same complexity as the classical Ekman model in numerical, but extends the conventional Ekman model to include the horizontal accelerated flow with the Ekman momentum approximation. A comparison between this modified Ekman model and other simplified accelerating PBL models is made. Results show that the Ekman model overestimates (underestimates) the wind speed and pumping velocity in the cyclonic (anticyclonic) shear flow due to the neglect of the acceleration flow, however, the semi-geostrophic Ekman model overestimates the acceleration effects resulting from the underestimating (overestimating) of the wind speed and pumping velocity in the cyclonic (anticyclonic) shear flow. The Ekman momentum approximation boundary layer model could be applied to the baroclinic atmosphere.The baroclinic Ekman momentum approximation boundary layer solution has both features of classical baroclinic Ekman layer and the Ekman momentum approximate boundary lager.
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    [2] Zhao Ming, Xu Yinzi, Wu Rongsheng, 1989: The Wind Structure in Planetary Boundary Layer, ADVANCES IN ATMOSPHERIC SCIENCES, 6, 365-376.  doi: 10.1007/BF02661542
    [3] He Jianzhong, 1993: Linear Momentum Approximation and Frontogenesis Caused by Baroclinic Ekman Momentum Flow, ADVANCES IN ATMOSPHERIC SCIENCES, 10, 103-112.  doi: 10.1007/BF02656958
    [4] TANG Xiaodong, TAN Zhemin, 2006: Boundary-Layer Wind Structure in a Landfalling Tropical Cyclone, ADVANCES IN ATMOSPHERIC SCIENCES, 23, 737-749.  doi: 10.1007/s00376-006-0737-3
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    [7] Meiying DONG, Chunxiao JI, Feng CHEN, Yuqing WANG, 2019: Numerical Study of Boundary Layer Structure and Rainfall after Landfall of Typhoon Fitow (2013): Sensitivity to Planetary Boundary Layer Parameterization, ADVANCES IN ATMOSPHERIC SCIENCES, 36, 431-450.  doi: 10.1007/s00376-018-7281-9
    [8] LIU Hongnian, JIANG Weimei, HUANG Jian, MAO Weikang, 2011: Characteristics of the Boundary Layer Structure of Sea Fog on the Coast of Southern China, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 1377-1389.  doi: 10.1007/s00376-011-0191-8
    [9] T. S. Spassova, 1992: A Theoretical Test of the Geostrophic Momentum Approximation, ADVANCES IN ATMOSPHERIC SCIENCES, 9, 251-255.  doi: 10.1007/BF02657516
    [10] Lu WANG, Wei QIANG, Haiyun XIA, Tianwen WEI, Jinlong YUAN, Pu JIANG, 2021: Robust Solution for Boundary Layer Height Detections with Coherent Doppler Wind Lidar, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 1920-1928.  doi: 10.1007/s00376-021-1068-0
    [11] ZHANG Guangzhi, XU Xiangde, WANG Jizhi, 2003: A Dynamic Study of Ekman Characteristics by Using 1998 SCSMEX and TIPEX Boundary Layer Data, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 349-356.  doi: 10.1007/BF02690793
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    • Manuscript History

    Manuscript received: 10 March 2002
    Manuscript revised: 10 March 2002
    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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    Wind Structure in an Intermediate Boundary Layer Model Based on Ekman Momentum Approximation

    • 1. Key Laboratory of Meso-Scale Severe Weather/ MOE, Department of Atmospheric Sciences. Nanjing University, Nanjing 210093,Key Laboratory of Meso-Scale Severe Weather/ MOE, Department of Atmospheric Sciences. Nanjing University, Nanjing 210093
    • Manuscript received: 2002-03-10
    • Manuscript revised: 2002-03-10

    Abstract: A quasi three-dimensional, intermediate planetary boundary layer (PBL) model is developed by including inertial acceleration with the Ekman momentum approximation, but a nonlinear eddy viscosity (1993). The model could keep the same complexity as the classical Ekman model in numerical, but extends the conventional Ekman model to include the horizontal accelerated flow with the Ekman momentum approximation. A comparison between this modified Ekman model and other simplified accelerating PBL models is made. Results show that the Ekman model overestimates (underestimates) the wind speed and pumping velocity in the cyclonic (anticyclonic) shear flow due to the neglect of the acceleration flow, however, the semi-geostrophic Ekman model overestimates the acceleration effects resulting from the underestimating (overestimating) of the wind speed and pumping velocity in the cyclonic (anticyclonic) shear flow. The Ekman momentum approximation boundary layer model could be applied to the baroclinic atmosphere.The baroclinic Ekman momentum approximation boundary layer solution has both features of classical baroclinic Ekman layer and the Ekman momentum approximate boundary lager.

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