Observations of Inertia-Gravity Waves in the Atlantic from Inverted Echo Sounders during FGGE
Observations of Inertia-Gravity Waves in the Atlantic from Inverted Echo Sounders during FGGE
复制标题
FGGE 期间通过倒置回声测深仪观测大西洋惯性重力波
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
E. Katz
中科院分区：
文献类型：
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作者：
S. Garzoli;E. Katz
摘要本研究基于西大西洋赤道附近锚定的反向回声测深仪的观测结果。这是一种探测大垂直尺度惯性重力波的好方法。光谱分析表明，在2 ~ 5天的波段内，谱密度水平是变化的。4个反向回声测深仪（IES）记录中的3个显示以3.75天为中心的方差增加。此外，在下半年（风力较强）部署的两个测深仪在2.14天和2.31天也显示出差异的峰值。对3.75天的光谱峰值最可能的解释是大气强迫的，垂直传播的惯性重力波具有n=3模态给出的经向结构。对应的等效深度为h=0.7 m，垂直波长为~ 730 m。根据IES记录的方差估计，能量密度为E = 0.7 × 103 J m−2。
Abstract The study is based on observations from inverted echo sounders anchored near the equator in the western Atlantic Ocean. It appears to be a good method of detecting inertia-gravity waves with large vertical scale. The spectral analysis of the records shows variable spectral density levels in the band of 2–5 days. Three of the four Inverted Echo Sounder (IES) records show an increase in the variance centered at 3.75 days. In addition, two sounders deployed during the latter half of the year (stronger winds) also show a peak in the variance at 2.14 and 2.31 days. The most likely interpretation of the spectral peak at 3.75 days is an atmospherically forced, vertically propagating inertia-gravity wave with a meridional structure given by the n=3 mode. The corresponding equivalent depth is h=0.7 m, and the vertical wavelength is ∼730 m. The energy density, estimated from the variance in the IES records, is E = 0.7 × 103 J m−2.