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Volume 30 Issue 1

Jan.  2013

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2013 >  30(1): 101-115

Effect of Boundary Layer Latent Heating on MJO Simulations

  • 1.

    Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149;The State Key Laboratory of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong;Climate Prediction Division, National Climate Center, Beijing 100081;Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149


doi: 10.1007/s00376-012-2031-x

  • A latent heating peak in the PBL was detected in a simulation by a global GCM that failed to reproduce Madden--Julian Oscillation (MJO). The latent heating peak in the PBL was generated by very shallow convection, which prevented moisture from being transported to the free troposphere. Large amount of moisture was therefore confined to the PBL, leading to a dry bias in the free atmosphere. Suffering from this dry bias, deep convection became lethargic, and MJO signals failed to occur. When the latent heating peak in the PBL was removed in another simulation, reasonable MJO signals, including the eastward propagation and the structure of its large-scale circulation, appeared. We therefore propose that the excessive latent heating peak in the PBL due to hyperactive shallow convection may be a reason for a lack of MJO signals in some simulations by other GCMs as well.
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    • Manuscript History

    Manuscript received: 10 January 2013
    Manuscript revised: 10 January 2013
    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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    Effect of Boundary Layer Latent Heating on MJO Simulations

    • 1. Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149;The State Key Laboratory of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong;Climate Prediction Division, National Climate Center, Beijing 100081;Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149
    • Manuscript received: 2013-01-10
    • Manuscript revised: 2013-01-10

    Abstract: A latent heating peak in the PBL was detected in a simulation by a global GCM that failed to reproduce Madden--Julian Oscillation (MJO). The latent heating peak in the PBL was generated by very shallow convection, which prevented moisture from being transported to the free troposphere. Large amount of moisture was therefore confined to the PBL, leading to a dry bias in the free atmosphere. Suffering from this dry bias, deep convection became lethargic, and MJO signals failed to occur. When the latent heating peak in the PBL was removed in another simulation, reasonable MJO signals, including the eastward propagation and the structure of its large-scale circulation, appeared. We therefore propose that the excessive latent heating peak in the PBL due to hyperactive shallow convection may be a reason for a lack of MJO signals in some simulations by other GCMs as well.

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