Large-scale planetary disturbances in stratospheric temperature at high-latitudes in the southern summer hemisphere
Large-scale planetary disturbances in stratospheric temperature at high-latitudes in the southern summer hemisphere
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DOI：
10.5194/acp-8-7557-2008
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发表时间：
2008-12
影响因子：
6.3
通讯作者：
M. Shepherd;T. Tsuda
中科院分区：
文献类型：
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作者：
M. Shepherd;T. Tsuda
利用COSMIC/FORMOSAT 3卫星星座在20 km和30 km高度的GPS射电掩星测量数据，研究了南半球夏季（2006年12月- 2007年2月）60 S-75 S纬度的全球大尺度（周期为bbb50 - 5天）波的结构和传播。光谱分析揭示了向东传播的行星尺度扰动，波数为1和2，周期为10、16和23天，以及波数为1和2的平稳波。得到的结果表明，南极夏季平流层非常活跃。这项工作的新颖之处在于使用了GPS COSMIC数据，每天提供多个低空时间，从而可以在南纬高纬度地区进行大规模的波分析，揭示通常在夏季观测不到的行星波活动，但更符合平流层冬末和春季的情况。
The global structure and propagation of large- scale (periods >5 days) waves in the Southern Hemisphere summer (December 2006-February 2007) at 60 S-75 S lat- itude are examined using temperature data from GPS ra- dio occultation measurements by COSMIC/FORMOSAT 3 satellite constellation at 20 km and 30 km altitude. Spectral analysis has revealed eastward propagating planetary scale perturbations with wavenumbers 1 and 2 and periods of 10, 16 and 23 days, and stationary waves with wavenumbers 1 and 2. The results obtained show a very dynamically active Antarctic summer stratosphere. The novel aspect of the work is in the use of the GPS COSMIC data providing multiple lo- cal times each day, thus allowing large-scale wave analysis at high Southern latitudes and revealing planetary wave activity not normally observed in summer, but more consistent with late winter and spring conditions in the stratosphere.