| Sea level observations are used to compute time series indices for the North Equatorial Current (NEC), the North Equatorial Counter-Current (NECC), the portion of the South Equatorial Current located north (SECN) and and south (SECS) of the equator. The indices are computed by perturbing the meridional profile of the mean surface dynamic height with monthly sea level variations and calculating the appropriate ridge to trough difference for each current for each month. The mean values of the indices have not been removed from the time series. A complete description of the derivation of these indices is given by Wyrtki in the Journal of Physical Oceanography (1974, Volume 4, pp. 372-380). |
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