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Climate of the seasonal cycle in the North Pacific and the North Atlantic oceans

Time series of monthly sea‐surface temperature (SST), air temperature (AT) and sea level pressure (SLP) were constructed from merged releases of the Comprehensive Ocean‐Atmosphere Data Set (COADS). The time series were decomposed into seasonal and non‐seasonal (short and long‐term) components. The contribution of the seasonal cycle to the total variance of SST and AT exceeds 80% in the mid and in some high latitude locations and reaches its peak (>95%) in the centres of subtropical gyres. In most cases, a combination of annual and semiannual harmonics accounts for more than 95% of the seasonal variability.