The interannual variation used for NOAA sea-level anomaly calculations is derived by removing both the long-term trend and the average seasonal cycle from the monthly mean sea level.
Sources
- Monthly Anomalies - Sea Level Trends - NOAA Tides & Currents (tidesandcurrents.noaa.gov)
- https://www.epa.gov/sites/default/files/2021-04/documents/sea-level_td.pdf (epa.gov)
- https://iridl.ldeo.columbia.edu/descriptions/.topexnoaa.html (iridl.ldeo.columbia.edu)
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