Correlation Of Beam And Diffuse Attenuation Coefficients Measured In Selected Ocean Waters

John G. Shannon

doi:10.1117/12.954489

10 November 1975 Correlation Of Beam And Diffuse Attenuation Coefficients Measured In Selected Ocean Waters

John G. Shannon

Proceedings Volume 0064, Ocean Optics IV; (1975) https://doi.org/10.1117/12.954489
Event: 19th Annual Technical Symposium, 1975, San Diego, United States

Abstract

The beam (volume) attenuation coefficient, a, and diffuse attenuation coefficient, K, of optical radiation have been measured in selected U.S. East Coast, Bahama, and Puerto Rico Trench waters. The objective was to determine what, if any, empirical relationship exists between these two optical properties over a wide range of turbidity. a was determined from transmittance versus depth profiles made with a beam transmissometer. K was determined from relative irradiance versus depth profiles made with a relative irradiance meter. In order to eliminate data bias introduced by spatial movement, temporal fluctuations, and spectral dependency, a and K were measured simultaneously and at a common wavelength (A = 535 nm). "Effective" (depth averaged) values of a and K, designated a and K respectively, were calculated in order to characterize the variable data versus depth profiles at each station with single values. The empirical expression: K = 0.2 7+ 0.04, applicable for the range 0.11 m-1 < 7< 1.6 m-I, has been determined for data combined from all locations. The degree of concurrence of this relationship with data obtained by others is discussed. Definitions of a and K, and discussion related to their differences are also presented.

Citation Download Citation

John G. Shannon "Correlation Of Beam And Diffuse Attenuation Coefficients Measured In Selected Ocean Waters", Proc. SPIE 0064, Ocean Optics IV, (10 November 1975); https://doi.org/10.1117/12.954489

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available