title: Toward closure of upwelling radiance in coastal waters.
abstract: We present three methods for deriving water-leaving radiance L(w)(lambda) and remote-sensing reflectance using a hyperspectral tethered spectral radiometer buoy (HyperTSRB), profiled spectroradiometers, and Hydrolight simulations. Average agreement for 53 comparisons between HyperTSRB and spectroradiometric determinations of L(w)(lambda) was 26%, 13%, and 17% at blue, green, and red wavelengths, respectively. Comparisons of HyperTSRB (and spectroradiometric) L(w)(lambda) with Hydrolight simulations yielded percent differences of 17% (18%), 17% (18%), and 13% (20%) for blue, green, and red wavelengths, respectively. The differences can be accounted for by uncertainties in model assumptions and model input data (chlorophyll fluorescence quantum efficiency and the spectral chlorophyll-specific absorption coefficient for the red wavelengths, and scattering corrections for input ac-9 absorption data and volume scattering function measurements for blue wavelengths) as well as radiance measurement inaccuracies [largely differences in the depth of the L(u)(lambda, z) sensor on the HyperTSRB].
authors.affiliation: Ocean Physics Laboratory, University of California at Santa Barbara, 6487 Calle Real, Suite A, Santa Barbara, California 93117, USA. grace.chang@opl.ucsb.edu
authors.forename: Grace C
authors.initials: GC
authors.lastname: Chang
authors.forename: Tommy D
authors.initials: TD
authors.lastname: Dickey
authors.forename: Curtis D
authors.initials: CD
authors.lastname: Mobley
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Boss
authors.forename: W Scott
authors.initials: WS
authors.lastname: Pegau