Abstract
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.
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