TY - JOUR
T1 - Measurement of Solar-stimulated Fluorescence in Natural Waters
AU - Hu, Chuanmin
AU - Voss, Kenneth J.
PY - 1998/1/1
Y1 - 1998/1/1
N2 - The oceanic Fraunhofer line discriminator (OFLD), designed to measure the solar -stimulated inelastic scattering in the ocean, has been deployed in various types of water in Florida Bay and the Dry Tortugas to measure Fraunhofer lines and oxygen-absorption lines near 689 nm in the solar spectrum. The line-filling principle and previous work enable us to partition the measured light into elastic, Raman scattering, and fluorescence components. We show that in optically deep, oligotrophic water, where chlorophyll a (Chl a) concentration is as low as 0.1 mg m −3 , fluorescence near 689 nm was still measurable by the OFLD. In moderately eutrophic shallow waters, where Chl a concentration ranges from 0.2 to 0.8 mg m −3 , the fluorescence from either Chl a or dissolved organic matter in the water column was found to be a negligible component of the total light field due to the additional light reflected from the bottom. We also include measurements of the solar -stimulated fluorescence for benthic surfaces, such as brain coral, and have found these to be saturated under normal solar illumination.
AB - The oceanic Fraunhofer line discriminator (OFLD), designed to measure the solar -stimulated inelastic scattering in the ocean, has been deployed in various types of water in Florida Bay and the Dry Tortugas to measure Fraunhofer lines and oxygen-absorption lines near 689 nm in the solar spectrum. The line-filling principle and previous work enable us to partition the measured light into elastic, Raman scattering, and fluorescence components. We show that in optically deep, oligotrophic water, where chlorophyll a (Chl a) concentration is as low as 0.1 mg m −3 , fluorescence near 689 nm was still measurable by the OFLD. In moderately eutrophic shallow waters, where Chl a concentration ranges from 0.2 to 0.8 mg m −3 , the fluorescence from either Chl a or dissolved organic matter in the water column was found to be a negligible component of the total light field due to the additional light reflected from the bottom. We also include measurements of the solar -stimulated fluorescence for benthic surfaces, such as brain coral, and have found these to be saturated under normal solar illumination.
UR - https://digitalcommons.usf.edu/msc_facpub/2012
UR - https://doi.org/10.4319/lo.1998.43.6.1198
U2 - 10.4319/lo.1998.43.6.1198
DO - 10.4319/lo.1998.43.6.1198
M3 - Article
VL - 43
JO - Limnology and Oceanography
JF - Limnology and Oceanography
ER -