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| The products listed here are various indices and calculations
created from the sea level data we archive. To view and download the individual
station data, check the DATA page.
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| SEA LEVEL
DEVIATIONS (GLOBAL) Deviations are defined here as the difference between the mean sea level for the given month and the 1993 to 1995 mean sea level at that station. This averaging period is chosen to correspond with various TOPEX/Poseidon products. Sea level has been corrected for the inverse barometer effect using atmospheric pressure obtained from the Climate Analysis Center. |
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SEA LEVEL DEVIATIONS (PACIFIC OCEAN), TIDE GAUGE - ALTIMETER ANALYSIS Deviations are defined here as the difference between the mean sea level for the given month and the 1993 to 2001 mean sea level at that station. Contour lines are obtained from the near-real time Topex altimeter analysis. |
| SEA LEVEL
ANOMALIES (PACIFIC OCEAN), TIDE GAUGE - ALTIMETER ANALYSIS Anomalies are defined here as the difference between the mean sea level for the given month and the mean annual cycle, specified as the long-term average sea level for that month at that station. The typical averaging period for the annual cycle is 1993 to 2001. Sea level has been corrected for the inverse barometer effect using atmospheric pressure obtained from the Climate Analysis Center. Contour lines are obtained from the near-real time Topex altimeter analysis. |
| UPPER OCEAN
VOLUME (TROPICAL PACIFIC) Sea level observations in the Pacific Ocean between 15S and 15N are used to compute a time series index for upper layer volume variations relative to a mean value of about 70x1014 m3. The annual cycle is not removed. A complete description of this index is given by Wyrtki in the Journal of Geophysical Research (1987, Volume 90, pp. 7129-7132). |
| CURRENT
INDICES (TROPICAL PACIFIC) 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 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). |
| TOPOGRAPHY
(TROPICAL PACIFIC) 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 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). |
