Quantum Yields of Soluble and Particulate Material in the Ocean
Abstract
The goals of this project were to better define the characteristics of spectral fluorescence quantum yields of particulate and soluble material in the ocean. Methods were developed for improved estimates of soluble absorption coefficients of oceanic material to improve estimates of the absorbed quantum flux that is needed to estimate The yields. These methods were implemented in numerous cruises in the California Current Indian Ocean and Sea of Japan. Fluorescence excitation and emission spectra were determined and scaled to known fluorescence standards to estimate quantum yields. Coastal waters of the Southern California Bight and San Diego Bay exhibited nearly linear response of fluorescence per absorbed quanta for 350 nm excitation and 450 nm emission suggesting that The quantum yield is relatively invariant. Cultures of phytoplankton were grown to evaluate the spectral quantum yield of in vivo chlorophyll a fluorescence. We determined that mycosporine amino acids with UV absorption, and xanthophyll pigments with absorption near 490 nm dramatically suppress The quantum yield of fluorescence. The results we have obtained could be used to improve models of trans-spectral sources for underwater light fields.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1999
- Accession Number
- ADA375906
Entities
People
- B. G. Mitchell
Organizations
- Scripps Institution of Oceanography