Mesoscale gravity wave variances from AMSU‐A radiances
Mesoscale gravity wave variances from AMSU‐A radiances
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DOI：
10.1029/2004gl019562
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发表时间：
2004-06
影响因子：
5.2
通讯作者：
Dong L. Wu
中科院分区：
文献类型：
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作者：
Dong L. Wu
本文提出了一种方差分析方法，用于从NOAA AMSU-A（Advanced Microwave Sounding Unit-A）辐射测量数据中提取重力波（GW）引起的温度波动。通过仔细去除仪器/测量噪声，该算法可以产生可靠的GW方差，最小可检测值小至0.1 K2。AMSU-A数据的初步分析显示，平流层中的GW方差图与UARS MLS（高层大气研究卫星微波临边探测器）发现的分布非常相似。然而，AMSU-A提供了更好的水平和时间分辨率来观测区域GW变化，例如亚南极岛屿上的活动。
A variance analysis technique is developed here to extract gravity wave (GW) induced temperature fluctuations from NOAA AMSU‐A (Advanced Microwave Sounding Unit‐A) radiance measurements. By carefully removing the instrument/measurement noise, the algorithm can produce reliable GW variances with the minimum detectable value as small as 0.1 K2. Preliminary analyses with AMSU‐A data show GW variance maps in the stratosphere have very similar distributions to those found with the UARS MLS (Upper Atmosphere Research Satellite Microwave Limb Sounder). However, the AMSU‐A offers better horizontal and temporal resolution for observing regional GW variability, such as activity over sub‐Antarctic islands.