马镜娴. 1986. 地形和非绝热加热共同强迫的流型突变[J]. 气象学报, 44(4):395-402, doi:10.11676/qxxb1986.057
地形和非绝热加热共同强迫的流型突变
ABRUPT CHANGE OF QUASIGEOSTROPHIC FLOW FORCED BY OROGRAPHY AND DIABATIC HEATING
投稿时间:1984-06-14  修订日期:1985-10-04
DOI:10.11676/qxxb1986.057
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马镜娴 甘肃省气象科学研究所 
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中文摘要:
      本文用低谱模式,研究了地形和非绝热加热共同强迫的准地转气流的突变.在一定的参数集合,随着外部热力强迫参数的渐变,激发出了谱系数与西风急流位置的突变.与单纯非绝热加热强迫的情况相比,地形引入后,改变了流型多平衡态的参数范围和流型突变的参数临界点的位置,并使平衡态流型的经向度加大.由夏至冬转换期间突然建立的南支急流的形态也更为接近观测事实.
英文摘要:
      A low-order spectral model is used to study abrupt change of quasigeostrophic current forced by both orography and diabatic heating.In certain parametric combinations,along with the gradual change of external thermal forcing,it is found that abrupt changes of both the spectral coefficients and the locations of the west jet stream can be stimulated.Introducing the orography into the model results in a change of the parametric range in which the multiple equilibrium of flow patterns exist and the shift of the parametric critical points at which the abrupt change of the locations of west jet streams is created,as well as an increase of the wave components of the equilibrium flow patterns.The aspects of simulated "South-Branch" jet streams are quite similar to the observational fact in the present of both the orography and the diabatic hearing than those in the case of the heating forcing.
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