Observations of Low-Frequency Inertia-Gravity Waves in the Lower Stratosphere over Arecibo
Observations of Low-Frequency Inertia-Gravity Waves in the Lower Stratosphere over Arecibo
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阿雷西博上空平流层下部低频惯性重力波的观测
DOI：
10.1175/1520-0469(1989)046
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
M. Larsen
中科院分区：
文献类型：
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作者：
C. Cornish;M. Larsen
1982年5月和1983年4月，我们用位于波多黎各（18.4°N）阿雷西博的430 MHz雷达对副热带对流层上部和平流层下部的水平风进行了观测。这两组观测结果显示，对流层顶上方的风场中存在一种缓慢变化的、反气旋旋转的、持续的结构，这与如果振荡与准惯性周期波相关联的话所预期的情况类似。1982年5月的数据的频谱分析表明，在地球固定的地球固定的参考框架的周期接近26小时的波。我们的计算表明，在18公里高度附近的临界水平上，内禀波周期从惯性频率的2.5倍变化到零。垂直于和平行于传播方向的扰动速度之间的相位变化是系统的高度以下的固有频率等于惯性频率，但表现出一个复杂的行为之间的高度和…
Abstract Observations of the horizontal wind in the subtropical upper troposphere and lower stratosphere were made with the 430-MHz radar located at Arecibo, Puerto Rico (18.4°N), in May 1982 and April 1983. Both sets of observations displayed a slowly varying, anticyclonically rotating, persistent structure in the wind field just above the tropopause, similar to what would be expected if the oscillations are associated with quasi-inertia period waves. A spectral analysis of the May 1982 data revealed that a wave with a period in the earth-fixed earth-fixed reference frame close to 26 h was present. Our calculations show that the intrinsic wave periods varied from ∼2.5 times the inertial frequency to zero at a critical level near 18-km altitude. The changes in phase between perturbation velocities perpendicular and parallel to the propagation direction were systematic below the height where the intrinsic frequency was equal to the inertial frequency but showed a complicated behavior between that height an...