National Oceanic and
Atmospheric Administration
United States Department of Commerce


FY 1993

Temporal sampling requirements for low frequency temperature variability in the eastern equatorial Pacific Ocean

Hayes, S.P., and M.J. McPhaden

NOAA Tech. Memo. ERL PMEL-96, NTIS: PB93-136422, 17 pp (1992)

The effects of temporal subsampling of the near equatorial thermal field are examined using Monte-Carlo techniques. Approximately 3 years of continuous data from moored temperature sensors on the equator at 110°W and 140°W in the Pacific Ocean were randomly subsampled at frequencies of 1, 2, and 5 samples per month. Spectra of subsampled and original series demonstrate that the errors caused by subsampling are position, depth, and frequency dependent. In general, for a given number of samples errors are larger at the eastern location and in the thermocline. Adequate (spectral agreement to within a factor of two) resolution for periods longer than 3 months can be obtained at most depths with five samples per month. Fewer measurements are required near the surface.

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