Inherent optical properties of the ocean: retrieval of the absorption coefficient of chromophoric dissolved organic matter from airborne laser spectral fluorescence measurements
Date
1995-10Author
Hoge, Frank
Vodacek, Anthony
Swift, Robert
Yungel, James
Blough, Neil
Metadata
Show full item recordAbstract
The absorption coefficient of chromophoric dissolved organic matter (CDOM) at 355 nm has been retrieved
from airborne laser-induced and water Raman-normalized CDOM fluorescence. Four combined airborne
and ship field experiments have demonstrated that (1) the airborne CDOM fluorescence-to--water
Raman ratio is linearly related to concurrent quinine-sulfate-standardized CDOM shipboard fluorescence
measurements over a wide range of water masses (coastal to blue water); (2) the vicarious calibration
of the airborne fluorosensor in units traceable to a fluorescence standard can be established and then
maintained over an extended time period by tungsten lamp calibration; (3) the vicariously calibrated
airborne CDOM fluorescence-to-water Raman ratio can be directly applied to previously developed
shipboard fluorescence-to-absorption algorithms to retrieve CDOM absorption; and (4) the retrieval is not
significantly affected by long-path multiple scattering, differences in attenuation at the excitation and
emission wavelengths, or measurement in the 180° backscatter configuration. Airborne CDOM
absorption measurements will find immediate application to (a) forward and inverse modeling of oceanic
water-leaving radiance and (b) validation of satellite-retrieved products such as CDOM absorption.