%0 Journal Article
%T Distribution of normalized water-leaving radiances at UV and visible wave bands in relation with chlorophyll a and colored detrital matter content in the southeast Pacific
%+ Laboratoire de MicrobiologiE de Géochimie et d'Ecologie Marines (LMGEM)
%+ Laboratoire d'océanographie de Villefranche (LOV)
%A Tedetti, Marc
%A Charrìère, Bruno
%A Bricaud, Annick
%A Para, Julien
%A Raimbault, Patrick
%A Sempere, Richard
%< avec comité de lecture
%@ 0148-0227
%J Journal of Geophysical Research
%I American Geophysical Union
%V 115
%N C010
%P 1-12
%8 2010-02-12
%D 2010
%R 10.1029/2009JC005289
%Z Sciences of the Universe [physics]/Ocean, AtmosphereJournal articles
%X [1] In-water radiometric measurements were performed in the southeast Pacific (8°S-35°S, 141°W-72°W) from October to December 2004 during the Biogeochemistry and Optics South Pacific Experiment cruise. Normalized water-leaving radiances (nL w (l)) were determined at eight wave bands within the ultraviolet (UV) (305, 325, 340, and 380 nm) and visible (412, 443, 490, and 565 nm) spectral domains. The highest nL w (l) (mW cm À2 sr À1) were recorded in the hyperoligotrophic waters of the South Pacific Gyre, with values increasing with wavelength from 305 (nL w = 0.64) to 380 nm (nL w = 3.18) in the UV range and decreasing from 412 (nL w = 4.46) to 565 nm (nL w = 0.23) in the visible region. The intense nL w (l) observed in the violet-blue domains were attributed to very low absorptions of colored detrital matter (CDM), likely related to a strong photobleaching of colored dissolved organic matter in the surface waters. We evaluated the relationships between the UV, violet, or blue/green wave band ratios of nL w (l) and surface total chlorophyll a (TChl a) concentration and CDM absorption (a CDM (l)). For TChl a, the best correlation was found with the blue/green ratio at 443 nm: TChl a (mg m À3) = 2.37[nL w (443)/nL w (565)] À1.51 (r 2 = 0.86 and RMS error (RMSE) = 23%). By contrast, for a CDM (l), the best correlation was observed when using the UV/green ratio at 325 nm: a CDM (325) (m À1) = 0.16[nL w (325)/nL w (565)] À0.69 (r 2 = 0.82 and RMSE = 16%). These results show the potential role of nL w (l) at UV wave bands for the assessment, through empirical algorithms, of colored detrital matter in the surface oceanic waters. Citation: Tedetti, M., B. Charrière, A. Bricaud, J. Para, P. Raimbault, and R. Sempéré (2010), Distribution of normalized water-leaving radiances at UV and visible wave bands in relation with chlorophyll a and colored detrital matter content in the southeast Pacific,
%G English
%2 https://hal.science/hal-00456621/document
%2 https://hal.science/hal-00456621/file/Tedetti%20et%20al_JGR_2010.pdf
%L hal-00456621
%U https://hal.science/hal-00456621
%~ INSU
%~ UPMC
%~ CNRS
%~ UNIV-AMU
%~ GIP-BE
%~ LMGEM
%~ LOV
%~ UPMC_POLE_3
%~ SORBONNE-UNIVERSITE
%~ SU-SCIENCES
%~ SU-SCI
%~ UMS-829
%~ SU-TI
%~ LOV_OMTAB
%~ ALLIANCE-SU
%~ TEST3-HALCNRS