Hi Xia, The topic to look up in the documentation is "anomaly". I think the best place to start would be this FAQ: How do I calculate climatologies and climatological anomalies? at http://ferret.pmel.noaa.gov/FERRET_17sep07/FAQ/analysis/climatologies.html or if you search the archives of the Users List for "anomaly" or "anomalies" you will find more discussion. Ansley Changshui Xia wrote:
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