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Proceedings Paper

Method for removing a majority of the error in PUV attenuation coefficients due to spectral drift in response with depth in the water column
Author(s): Karen W. Patterson; Raymond C. Smith; Charles Rockwell Booth
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Paper Abstract

It is well known that UV radiation has the potential to cause significant damage to living organisms. Generally, shorter UV wavelengths have the potential to do exponentially more damage than longer wavelengths. Therefore, in calculating biological doses of radiation to marine organisms, even small spectral variations in recorded UV irradiance s can propagate into large errors. The PUV instrument made by Biospherical Instruments, Inc. is a commonly used filter-based radiometer used to measure UV radiation in the water column. it has long been known that he signal from the PUV becomes increasingly weighted by longer wavelengths with increasing depth in the water column. This is due to the increased attenuation of shorter UV wavelengths are compared to longer UV wavelengths in the water column. Presented here is a method of removing the majority of the spectral drift effect from the UV attenuation coefficients calculated from PUV data for biogenic waters. Chlorophyll and dissolved organic matter are allowed to vary independently with depth in a simple high-resolution spectral model for a variety of atmospheric total zone concentrations and solar zenith angels. To investigate the magnitude of errors and possible corrections, attenuation coefficients are calculated using the estimated PUV spectral response function for each channel and for 1nm model wavebands at 305, 320, 340 and 380 nm. The same process was conducted for clear water. Differences between the PUV-weighted attenuation coefficients and corresponding model attenuation coefficients for clear water and biogenic waters are used to develop a fairly simple method of eliminating a large portion of the spectral drift effect in attenuation coefficients calculated from PUV data.

Paper Details

Date Published: 6 February 1997
PDF: 6 pages
Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); doi: 10.1117/12.266393
Show Author Affiliations
Karen W. Patterson, Univ. of California/Santa Barbara (United States)
Raymond C. Smith, Univ. of California/Santa Barbara (United States)
Charles Rockwell Booth, Biospherical Instruments, Inc. (United States)

Published in SPIE Proceedings Vol. 2963:
Ocean Optics XIII
Steven G. Ackleson; Robert J. Frouin, Editor(s)

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