COSMIC GPS Observations of Northern Hemisphere winter stratospheric gravity waves and comparisons with an atmospheric general circulation model
COSMIC GPS Observations of Northern Hemisphere winter stratospheric gravity waves and comparisons with an atmospheric general circulation model
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DOI：
10.1029/2008gl033174
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发表时间：
2008-05
影响因子：
5.2
通讯作者：
S. Alexander;T. Tsuda;Y. Kawatani
中科院分区：
文献类型：
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作者：
S. Alexander;T. Tsuda;Y. Kawatani
利用COSMIC卫星温度数据，从尺寸为10°×5°的网格单元中垂直波长小于7公里的重力波推导出2006/07冬季北半球平流层平均势能Ep；并研究大小为 20° × 5° × 7 天的细胞的纵向和横向变化。 17-23公里处的大Ep主要与副热带急流有关，并表现出显着的纵向变化。由于背景风条件，当地地形来源对总 Ep 的贡献可能出现在加拿大落基山脉、斯堪的纳维亚半岛和日本北部上方，但不会出现在喜马拉雅山脉上方。通过过滤 0-10 m s−1 背景纬向风观察到，许多波浪可能具有较低的地面相速度。将 COSMIC 结果与 T106L60 AGCM 进行比较，证实了与副热带急流相关的生成、向上传播和观测到的重力波的低相速度。
COSMIC satellite temperature data are used to derive the 2006/07 winter mean stratospheric Northern Hemisphere potential energy Ep from gravity waves with vertical wavelengths less than 7 km in grid cells of size 10° × 5°; and to study longitudinal and latitudinal variability in cells of size 20° × 5° × 7 days. Large Ep at 17–23 km is mostly associated with the sub‐tropical jet and shows significant longitudinal variability. Some contribution to total Ep from local orographic sources may occur above the Canadian Rockies, Scandinavia and northern Japan, but not above the Himalayas, due to the background wind conditions. Many of the waves are likely to have low ground‐based phase speeds, as observed by filtering around the 0–10 m s−1 background zonal wind. COSMIC results are compared with a T106L60 AGCM, confirming sub‐tropical jet related generation, upward propagation and low phase speeds of the observed gravity waves.