Global distribution of atmospheric waves in the equatorial upper troposphere and lower stratosphere: COSMIC observations of wave mean flow interactions
Global distribution of atmospheric waves in the equatorial upper troposphere and lower stratosphere: COSMIC observations of wave mean flow interactions
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DOI：
10.1029/2008jd010039
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发表时间：
2008-12
影响因子：
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通讯作者：
S. Alexander;T. Tsuda;Y. Kawatani;M. Takahashi
中科院分区：
文献类型：
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作者：
S. Alexander;T. Tsuda;Y. Kawatani;M. Takahashi
[1]利用全球定位系统（gps）掩星卫星星座数据获取的温度剖面图，研究了垂直波长小于7 km的赤道重力波势能及其与背景准双年振荡（QBO）风的相互作用。数据被分成经度为20°、纬度为5°的网格。结果表明，垂直传播的对流产生的重力波与背景平均流相互作用。在下降的0 m s−1 QBO东切变相线附近的势能增强。通过带通滤波波数-频温度谱，得到了纬向波数s≤9的赤道俘获开尔文波和混合罗斯比重力波。它们的时间，空间和垂直结构，传播和波-平均流相互作用被检查相对于背景平均流。将COSMIC观测到的赤道波与OLR观测到的赤道波进行了比较，并讨论了差异。
[1] Temperature profiles derived from Constellation Observing System for Meteorology, Ionosphere and Climate Global Positioning System Radio Occultation satellite constellation data are used to study equatorial gravity wave potential energy associated with waves having vertical wavelengths of less than 7 km and their interaction with the background quasi-biennial oscillation (QBO) wind. The data are binned into grids of size 20° in longitude and 5° in latitude. Results show evidence of vertically propagating convectively generated gravity waves interacting with the background mean flow. Enhancements in potential energy around the descending 0 m s−1 QBO eastward shear phase line are observed. Equatorially trapped Kelvin waves and Mixed Rossby Gravity Waves with zonal wave numbers s ≤ 9 are obtained by bandpass filtering wave number-frequency temperature spectra. Their temporal, spatial and vertical structures, propagation and wave-mean flow interactions are examined with respect to the background mean flow. Equatorial waves observed by COSMIC are compared with those seen in OLR data, with differences discussed.