| 中小尺度运动中风场和气压场的适应 |
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| 引用本文： | 叶笃正,李麦村.中小尺度运动中风场和气压场的适应[J].气象学报,1964,34(4):409-423. |
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| 作者姓名： | 叶笃正 李麦村 |
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| 作者单位： | 中国科学院地球物理研究所
(叶笃正)，中国科学院地球物理研究所(李麦村) |
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| 摘 要： | 在大型运动中有所谓地转适应的现象,本文研究了中小尺度运动中风场和气压场之间的适应问题。 由尺度分析可以发现:在一般中小尺度运动方程中,时间导数项较其中的各主要项小一个量极。因此可以认为中小尺度运动是在力的准平衡状态下进行缓慢的演变。当有某种原因破坏了这种力的准平衡态时,即有一种机制使运动回到准平衡来。这种准平衡态是惯性力(即速度平流)、科氏力和气压梯度力三者之间的准平衡。 由准平衡态的破坏恢复到准平衡的过程称为中小尺度的适应过程;准平衡态下的演变过程称为准常定过程。文中讨论了这两种过程中运动的物理性质。指出:对中尺度运动而言在适应过程中D>>ζ,在准常定过程中D≤ζ,这里D和ζ分别为散度和涡度。 设在某一有限的区域中,运动的平衡态受到了严重破坏,作为初值问题可以计算破坏以后运动的发展。计算结果表明:在短暂的时间内,气象要素有一急烈变化和调整,重新恢复准平衡态;时间稍长运动即进入准常定的演变。
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| 收稿时间： | 1964/4/10 0:00:00 |
| 修稿时间： | 5/1/1994 12:00:00 AM |
THE ADAPTATION BETWEEN THE PRESSURE AND THE WIND FIELD IN THE MESO-AND SMALL-SCALE MOTION |
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| YEH TU-CHENG and LI MAI-TSUN.THE ADAPTATION BETWEEN THE PRESSURE AND THE WIND FIELD IN THE MESO-AND SMALL-SCALE MOTION[J].Acta Meteorologica Sinica,1964,34(4):409-423. |
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| Authors: | YEH TU-CHENG and LI MAI-TSUN |
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| Institution: | Institute of Geophysics and Meteorology, Academia Sinica;Institute of Geophysics and Meteorology, Academia Sinica |
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| Abstract: | In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation.This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion.Therefore it may be concluded that the motion of these scales also proceeds slowly under the condition of quasi-balanced forces just as that the large-scale motion proceeds quasi-geostrophically.If,however,in some way this quasi-balanced condition is disturbed,there must be a mechanism to bring the motion back to the quasi-balanced state.For the meso- and small-scale motion the inertia force (velocity advection),the coriolis force and the force of pressure gradient are in quasi-balanced state. |
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