A STUDY OF VARIATIONS OF THE GENERAL CIRCULATION
A STUDY OF VARIATIONS OF THE GENERAL CIRCULATION
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DOI：
10.1175/1520-0469(1950)007
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发表时间：
1950-06
期刊：
影响因子：
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通讯作者：
H. Riehl;T. Yeh;N. E. L. Seur
中科院分区：
文献类型：
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作者：
H. Riehl;T. Yeh;N. E. L. Seur
本文对近28个月来大气环流特别是高空西风带强度的变化进行了定量研究。强调以300毫巴高度为代表的对流层高层的作用，并试图确定热带是否对中纬度天气有任何可测量的影响。至少在研究的部分时期，计算覆盖了10°N至70°N的纬度带。为了清楚地显示波动，它们用季节和平均纬度梯度的偏差来表示。这些偏差占平均环流的20%以上，即使在最强西风带也是如此。关注的不是非常小的值，其准确性值得怀疑。当对偏差的纬度分布，特别是西风带动量的纬度分布进行随时间的绘制时，就会出现明确的长期趋势。高低西风动量带逐渐穿过纬度圈，有时由北向南，但通常是由北向南。
Abstract Changes of the general circulation, especially the strength of the upper westerlies, over 28 months are investigated quantitatively.The role of the high troposphere, represented by the 300-mb level, is stressed and it is sought to determine whether the tropics have any measurable influence on middle-latitude weather. Computations cover the latitude belt 10°N to 70°N, at least for part of the periods studied. To bring out the fluctuations clearly, they are expressed in terms of deviations from seasonal and mean latitudinal gradients. These deviations amount to over 20 per cent of the mean circulation, even in the belt of strongest westerlies. The concern is not with very small values whose accuracy would be questionable. When the latitudinal distribution of deviations, especially those of momentum of the westerlies, is plotted against time, definite long-term trends appear. Bands of high and low westerly momentum gradually traverse the latitude circles, sometimes from north to south, but usually f...