Abstract

During descents into the sea to depths of over 1400 feet Beebe observed that the color of the water illuminated by the sun was a pure blue and measured the candle power of the illumination at various depths down to 800 feet. At 800 feet the spectrum was a narrow band centering at about wave length 520mμ. Using the light absorption coefficients of sea water as measured in the laboratory and the Raman-Einstein-Smoluchowski theory of the scattering of light in liquids, it is found that the spectrum of the daylight at 800 feet in the sea has a maximum brightness at about 500mμ; this agrees well enough with the observation.

The calculated candle powers of the undersea daylight illumination were much greater than the observed values. The assumption that the absorption in the sea below 200 feet was the same as the laboratory measured absorption and in the surface layers down to 200 feet was about 5 times the laboratory value led to good agreement between the observed and calculated candlepowers at all depths. The surface layer absorption would be accounted for if 25 millionths of the volume of the surface water was occupied by opaque material.

© 1932 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Scattering of Daylight in the Sea

C. L. Utterback and Wilhelm Jorgensen
J. Opt. Soc. Am. 26(6) 257-259 (1936)

Brightness and Polarization of the Daylight Sky at Various Altitudes above Sea Level

R. Tousey and E. O. Hulburt
J. Opt. Soc. Am. 37(2) 78-92 (1947)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription