| 地形的动力作用与冷锋锋生研究 |
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| 引用本文： | 肖庆农,伍荣生,张颖.地形的动力作用与冷锋锋生研究[J].大气科学,1997,21(3):289-296. |
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| 作者姓名： | 肖庆农 伍荣生 张颖 |
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| 作者单位： | 南京大学大气科学系中尺度灾害性气象开放实验室,南京 210093 |
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| 摘 要： | 本文建立了一个考虑天气尺度水平变形场的二维、滞弹性、非静力平衡锋生模式，对冷锋过山时的锋生锋消机制进行了数值研究，试验结果表明:当无地形影响时，由于变形场的锋生作用与摩擦等因子的锋消作用相互抵消，冷锋最终达到其强度的准定常状态；当考虑地形影响时，地形强迫环流与锋面环流相互作用，使得锋面强度在山前和山后发生变化，在冷锋开始爬坡时锋生，爬过半山腰后开始锋消，过山顶后锋面强度变化不明显或者有微弱锋生，到达山脚后开始强烈锋生，并在地形下游其强度达到最大；总之，冷锋在翻越山脉或从高原移到平原之后，锋面发展的强度比冷锋不遇到地形时的更大。
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| 关 键 词： | 锋生 地形影响 数值研究 |
Dynamic Influence of Orography on Frontogenesis |
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| Xiao Qingnong,Wu Rongsheng and Zhang Ying.Dynamic Influence of Orography on Frontogenesis[J].Chinese Journal of Atmospheric Sciences,1997,21(3):289-296. |
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| Authors: | Xiao Qingnong Wu Rongsheng and Zhang Ying |
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| Abstract: | In this paper, a two-dimensional, anelastic non-hydrostatic frontal model including synoptic horizontal deformation wind fields is developed to study frontogenesis over orography. It indicates that the model can simulate the frontal development and its corresponding circulation vividly. If there is no orography, frontogenesis of deformation fields and frontolysis effects of friction can reach quasi-equilibrium and hence the front is in a steady state. If orography is existed, its circulation interacts with the frontal circulation and the frontal intensity changes on the upwind and downwind side. On the upslope side of the orography, a cold front is first in frontogenesis state and then in frontolysis after passes the mid-upslope. The frontal intensity varies slowly or only slight frontogenesis is on the downslope side of orography. After the front passes through the mountain foot, frontogenesis is obvious and reaches a maximum point in far downstream of orography. The intensity with orography is much greater than that without orography. |
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| Keywords: | frontogenesis orography numerical study |
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