| 簡单斜压大气中热成风的建立和破坏(一) |
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| 引用本文： | 陈秋士.簡单斜压大气中热成风的建立和破坏(一)[J].气象学报,1963,33(1):51-63. |
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| 作者姓名： | 陈秋士 |
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| 作者单位： | 北京大学地球物理系 |
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| 摘 要： | 本文第一部分利用两层模式討論了热成风的适应問題.如果起始非热成风流場的热成风涡度大于溫度場的热成风涡度时,促使上升运动加强,反之,促使下沉运动加强。对于250—750毫巴之間的斜压系統,适应的特征尺度L_0,是决定流場向溫度場調整,还是溫度場向流場調整的临界水平尺度。 第二部分根据溫度場和流場的平流作用,分析了非热成风产生的机制.并由热成风适应速率和破坏速率的对比,討論了准地轉运动和非地轉运动的形成。 最后,用热成风不断破坏和建立的观点和方法,分析了长波斜压不稳定发展的过程,并进一步揭示了它的物理本貭。
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| 收稿时间： | 1962/8/16 0:00:00 |
| 修稿时间： | 1962/10/30 0:00:00 |
ON THE FORMATION AND THE DESTRUCTION OF THERMAL WIND IN A SIMPLE BAROCLINIC ATMOSPHERE |
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| CHEN CHU-SHIH.ON THE FORMATION AND THE DESTRUCTION OF THERMAL WIND IN A SIMPLE BAROCLINIC ATMOSPHERE[J].Acta Meteorologica Sinica,1963,33(1):51-63. |
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| Authors: | CHEN CHU-SHIH |
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| Institution: | Peking University |
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| Abstract: | In this paper, the principle of the variation,of the vertical motion in the adjusting process of the Thermal wind is discussed by means of a simple two-layer baroclinic model. When the thermal wind vorticity in wind field is larger than that in temperature field, the ascending motion must accelerated, and vice versa. For the baroclinic system in the upper troposphere between 250 mb and 750 mb, the temperature field is adjusted towards wind field when.the scale of the system is smaller than a critical scale L0, and the reversed is true when the scale of the system is larger than L0. This is, demonstrated by calculated examples in which two horizontal scale are used. They are about 1000 km and 300 km respectively. In the former (1000 km), the adjustment is mainly towards the temperature field, and later is mainly towards the wind field. According to the contrast between the rate of the formation of the thermal wind and that of the destruction, we elucidate primarily the physical process of the formation of the quisi-geostrophic motion and non-geostrophic motion. Finally we applied the method proposed in present paper to examine the baroclinic instability of the long wave, and then clerify the vorticity mechanism of the baroclinic instability. |
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