Wave Structure of the Tropical Stratosphere over the Marshall Islands Area during 1 April–1 July 1958
Wave Structure of the Tropical Stratosphere over the Marshall Islands Area during 1 April–1 July 1958
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1958年4月1日至7月1日马绍尔群岛地区热带平流层波浪结构
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
C. Tsay
中科院分区：
文献类型：
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作者：
R. Lindzen;C. Tsay
本文分析了1958年4月1日至7月1日期间马歇尔群岛地区平流层风资料在4-6天周期范围内的贡献。结果表明，除垂直波长<2 km的波外，这一时期赤道平流层4-6天的功率一定是由Kelvin波、重力-Rossby混合波和n=1的Rossby波的某些组合引起的，这些波的纬向波数<7-10。它进一步表明，理论模型，其中上述三种波型的每一个是与纬向波数为3或4是一致的数据。由此产生的观测校准模型被用来计算波吸收的平均流的加速度，然后与观测到的加速度进行比较。一般说来，波能令人满意地解释23公里以上的加速度。在23公里以下，需要一个额外的东风动量源，具有特定的垂直分布，我们表明，这可以由一个n=1的东风重力波提供，该东风重力波可以产生一个特定的垂直分布。
Abstract Stratospheric wind data for the Marshall Islands region during 1 April–1 July, 1958, are analyzed for contributions in the 4–6 day period range. It is shown that, excluding waves with vertical wavelengths <2 km from the data, 4–6 day power in the equatorial stratosphere during this period must be due to some combination of Kelvin, mixed gravity-Rossby, and n=1 Rossby waves with zonal wavenumbers <7–10. It is further shown that a theoretical model wherein each of the above three wave types is associated with a zonal wavenumber of either 3 or 4 is consistent with the data. The resulting observationally calibrated model is used to calculate the acceleration of the mean flow by wave absorption, which is then compared with the observed acceleration. In general, the waves satisfactorily account for accelerations above 23 km. Below 23 km there is a need for an additional source of easterly momentum with a specific vertical distribution which we show could be provided by an n=1 easterly gravity wave whos...