| 北半球50hPa平均环流的若干特征及其与500hPa的某些关联 |
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| 引用本文： | 瞿章,张海俊.北半球50hPa平均环流的若干特征及其与500hPa的某些关联[J].高原气象,1990,9(4):424-431. |
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| 作者姓名： | 瞿章 张海俊 |
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| 作者单位： | 中国科学院兰州高原大气物理研究所
(瞿章，张海俊)，中国科学院兰州高原大气物理研究所(贺慧霞) |
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| 基金项目： | 国家自然科学基金资助项目，中国科学院兰州分院择优基金资助项目 |
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| 摘 要： | 本文根据北半球50hPa20年平均环流的槽脊特征,分析发现:在全年各月,尤其是冬半年中高纬圈,以2波为主要特征;夏季50hPa平均环流在30°N圈的90—120°E上存在着可能是青藏高原影响的强高压脊。 对50hPa超长波的波数、波长以及500hPa占50hPa波长之比率分析发现:由于地转偏向力向北(南)的增加(减小)和平均波长向北(南)的减小(增大)的相反作用的共同结果,50hPa上的波数在极地和赤道少,而在中纬度最多,这与500 hPa相类似; 对流层(500hPa)与平流层(50hPa)的平均波长比率冬季明显大于夏季,尤其是中高纬度。这表明中高纬度对流层与平流层之间冬季比夏季有着更多的相互作用。这与Charney和Drazin的理论分析相一致。
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| 关 键 词： | 环流 平流层 槽脊 关联 波长 比率 |
SOME FEATURES OF 50 hPa MEAN CIRCULATION AND THEIR SOME CORRELATIVITY WITH 500 hPa CIRCULATION |
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| Qu Zhang Zhang Haijun He Huixia.SOME FEATURES OF 50 hPa MEAN CIRCULATION AND THEIR SOME CORRELATIVITY WITH 500 hPa CIRCULATION[J].Plateau Meteorology,1990,9(4):424-431. |
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| Authors: | Qu Zhang Zhang Haijun He Huixia |
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| Abstract: | In this paper the multi-year averaged features of both troughs and ridges on 50 hPa over 20 years (1965-1984) and their some correlativities with 500 hPa circulation have been analysed.
The results are as follows:
1) The dominated circulation on 50 hPa in all the year around is two wave pattern, especially in mid- and high-latitudes in the months of winter-half year. The strong high ridge over the Tibet Plateau in Summer may have some relation to the Plateau.
2) There are more wave numbers of ultra-long waves in mid-latitudes on 50 hPa than in high- and lower-latitudes, like that on 500 hPa. The some possibly reasons for it was explained.
3) The ratio of mean wave-length on 500 hPa to that on 50 hPa is considerably larger in Winter than in Summer, especially on mid- and high-latitudes. It seems that the interaction between stratosphere and troposphere on mid- and high-latitudes is stronger in Winter than in Summer. |
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| Keywords: | Stratosphere Multi-year mean trough and ridge The ratio of wave-length on 500 hPa to that on 50 hPa |
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