. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 340 S. JOHNSEN AND E. A WIDDER 7 cm 4 cm fiber optic cable to spectrophotometer 3 cm diameter convex lens 7 cm mm ins aperture 3 cm glass tank (no lid) plexiglas platform. log 1 filter 3 mm iris aperture 3 cm diameter convex lens fiber optic pinhole source Figure 1. Diagram of the apparatus used to measure transparency. Calculating the effect of tissue transmission spectra on the spectrum of downwelling light Unless the percent transmission of a tissue is constant with respect to wavelength, the tissue will have an effec
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 340 S. JOHNSEN AND E. A WIDDER 7 cm 4 cm fiber optic cable to spectrophotometer 3 cm diameter convex lens 7 cm mm ins aperture 3 cm glass tank (no lid) plexiglas platform. log 1 filter 3 mm iris aperture 3 cm diameter convex lens fiber optic pinhole source Figure 1. Diagram of the apparatus used to measure transparency. Calculating the effect of tissue transmission spectra on the spectrum of downwelling light Unless the percent transmission of a tissue is constant with respect to wavelength, the tissue will have an effect on the spectrum of the downwelling light that passes through it. In general, percent transparency was positively and linearly proportional to wavelength (see Results). Hereafter, the slope of the regression of percent transpar- ency on wavelength is referred to as the T-W slope. The alteration of the spectrum of downwelling light after pass- ing through materials with different T-W slopes was cal- culated. The downwelling spectrum was taken in Ocean- ographer Canyon at 260 m and 60 m, using the PS 1000 multichannel spectrometer. These two depths were chosen because they represent a near-surface and an asymptotic light field. An underwater light field is referred to as asymptotic when the position of the sun has no effect on the light field's spatial characteristics (Jerlov, 1976). Light was transmitted to the PS 1000, operated from the back dive chamber of the JSL submersible, via a 1-mm fiber- optic through-hull penetrator. To calculate the effects of tissues with different T-W slopes on the downwelling light spectrum, a spectrum with a given slope was multiplied by the measured downwelling light spectrum and the resultant spectrum was divided by its peak value. To factor out the absolute value of the T-W slope, the slopes used were normalized by percent transmission at 480 nm. Therefore, a normalized T-W slope of 1%/nm describes a linear transmission spectrum that has a val
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
