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Sea Level Anomalies or SSHA (Sea Surface Height Anomalies)
Difference between the observed sea surface height and the mean sea level. The SLA allows us to monitor ocean variability due to seasonal variations and climatic phenomena such as El Niño. Sea level variability (the standard deviation over time) is somewhere between 2-3 cm and 60 cm, depending on energy levels in different parts of the ocean. For altimetry data, these anomalies are not usually computed with respect to a seasonal mean, but to a multi-annual mean.