. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography I I I I 1—1 l—J I—L 15° 12° 9° 6° 3° 0° 3° 6* 9° 12° 15* James, 1939). These spectrally dependent coefficients show that the min- imum attenuation coefficient (a) occurs at ym and has a value of (nr1) for pure water, I7 = Ine -adz Here I0 and Iz are the direct beam intensities entering and leaving the layer dz. The difficulty of beam attenuance measurements has been overcome, for many applications, by obtaining spectral irradiance (2tt)
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography I I I I 1—1 l—J I—L 15° 12° 9° 6° 3° 0° 3° 6* 9° 12° 15* James, 1939). These spectrally dependent coefficients show that the min- imum attenuation coefficient (a) occurs at ym and has a value of (nr1) for pure water, I7 = Ine -adz Here I0 and Iz are the direct beam intensities entering and leaving the layer dz. The difficulty of beam attenuance measurements has been overcome, for many applications, by obtaining spectral irradiance (2tt) measurements (, Tyler and Smith, 1970). Spectral irradiance is the solar radia- tional energy passing through a horizontal unit area of surface, in unit time, in unit increments of wavelength, in either upward or downward direction. Such measurements show that the wavelength of maximum irradi- ance shifts toward ym with increasing depth in clear water (fig. 6) this agrees with the spectral attenuance measurements. t r T r. h 24 Figure 6. The complete solar spectrum of downward irradiance in the sea (after. Jerlov3 1968). 1284. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by Supt. of Docs. U. S. G. P. O.
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