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Full-Text Articles in Physical Sciences and Mathematics
Determination Of The Absorption Coefficient Of Chromophoric Dissolved Organic Matter From Underway Spectrophotometry, Giorgio Dall’Olmo, Robert J. W. Brewin, Francesco Nencioli, Emanuele Organelli, Ina Lefering, David Mckee, Rüdiger Röttgers, Catherine Mitchell, Emmanuel Boss, Annick Bricaud, Gavin Tilstone
Determination Of The Absorption Coefficient Of Chromophoric Dissolved Organic Matter From Underway Spectrophotometry, Giorgio Dall’Olmo, Robert J. W. Brewin, Francesco Nencioli, Emanuele Organelli, Ina Lefering, David Mckee, Rüdiger Röttgers, Catherine Mitchell, Emmanuel Boss, Annick Bricaud, Gavin Tilstone
Marine Sciences Faculty Scholarship
Measurements of the absorption coefficient of chromophoric dissolved organic matter (ay) are needed to validate existing ocean-color algorithms. In the surface open ocean, these measurements are challenging because of low ay values. Yet, existing global datasets demonstrate that ay could contribute between 30% to 50% of the total absorption budget in the 400-450 nm spectral range, thus making accurate measurement of ay essential to constrain these uncertainties. In this study, we present a simple way of determining ay using a commercially-available in-situ spectrophotometer operated in underway mode. The obtained ay values were validated using independent collocated measurements. The method is …
Simplified Model Of Spectral Absorption By Non-Algal Particles And Dissolved Organic Materials In Aquatic Environments, B. B. Cael, Emmanuel Boss
Simplified Model Of Spectral Absorption By Non-Algal Particles And Dissolved Organic Materials In Aquatic Environments, B. B. Cael, Emmanuel Boss
Marine Sciences Faculty Scholarship
© 2017 Optical Society of America. Absorption by non-algal particles (NAP, ad) and colored dissolved organic matter (CDOM, ag) are frequently modeled by exponential functions of wavelength, either separately or as a sum. We present a new representation of NAP-plus-CDOM absorption adg based on the stretched exponential function adg(λ) = Aexp{−[s(λ − λo)]β}, whose parameter β can be considered a measure of optical heterogeneity. A double exponential representation of adg can be fit extremely well by a stretched exponential for all plausible parameter combinations, despite having one fewer free parameter than a double exponential. Fitting two published compilations of in …