. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Digital low-pass time series filtering techniques were used to produce the smooth curve in Fig. These techniques, to be explained in some detail below, permit an objective filtering of the unwanted periodicities with a minimum loss of significant data trends. The filtering was performed on a UNIVAC 110 8 using a FESTSA (Herman and Jacobson, 19 75) software system at the Atlantic Oceanographic and Meterological Laboratories. T UJ - CC < or CD
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Digital low-pass time series filtering techniques were used to produce the smooth curve in Fig. These techniques, to be explained in some detail below, permit an objective filtering of the unwanted periodicities with a minimum loss of significant data trends. The filtering was performed on a UNIVAC 110 8 using a FESTSA (Herman and Jacobson, 19 75) software system at the Atlantic Oceanographic and Meterological Laboratories. T UJ - CC < or CD a: < UJ o < < 300- 200-. 100 - 400 450 500 550 600 650 700 WAVELENGTH (nm) Figure Example of upwelling spectral irradiance before (broken line) and after (solid line) filtering to eliminate the effect of ocean, surface glitter variations due to surface waves. The spectra were digitized off the strip chart at intervals of 20 points per inch; the points were sufficiently close to retain the shape of the original traces. The trace in Fig. , provided 248 data points. As different wavelength drive speeds were used on different stations, this number varied from scan to scan. In order to choos frequency energy with is important to identi signals. Fig. con relative strengths of scan shown in Fig. metry scan using Tukey One can see strong per 30 data points per eye signals that give the appearance. e a filter that successfully removes high a minimum loss of significant trends, it fy the periods of the high frequency tains a plot (light, broken line) of the various periodicities of the spectrometry This is a power spectrum of the spectro- 's method (see Herman and Jacobson, 1975). iodicities at approximately 6,7,9,20, and le. These are the dominant high frequency original scan in Fig. its sawtooth 140. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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