Assessing the Variability in the Relationship Between the Particulate Backscattering Coefficient and the Chlorophyll <i>a</i> Concentration From a Global Biogeochemical‐Argo Database

Barbieux, Marie; Uitz, Julia; Bricaud, Annick; Organelli, Emanuele; Poteau, Antoine; Schmechtig, Catherine; Gentili, Bernard; Obolensky, Grigor; Leymarie, Édouard; Penkerc’h, Christophe; D’Ortenzio, Fabrizio; Claustre, Hervé

doi:10.1002/2017jc013030

Cited by 69 publications

(90 citation statements)

References 145 publications

(224 reference statements)

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“…Our data regarding the relationship of [Chla] and b bp is consistent with the global relationship derived by Barbieux et al (), at both ML and DCM (Figure a). The difference of scatter points between ML and DCM as well as the discrepancy of two regressed relationships suggest that there was less [Chla] per unit of b bp at the surface compared to the subsurface, owing to either photoacclimation process (Behrenfeld et al, ) or/and the phytoplankton community composition (Cetinić et al, ).…”

Section: Resultssupporting

confidence: 92%

“…“0347‐ML” and “0347‐DCM” represent the averaged value in the mixed layer and at the DCM observed by Float 0347, respectively (with similar notation for Float 0348). “B18‐ML” and “B18‐DCM” represent the regression relationships of Barbieux et al () based on a global Bio‐Argo data set in mixed layer (ML) and at DCM, respectively. DCM = deep chlorophyll‐a maximum.…”

Section: Resultsmentioning

confidence: 99%

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Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

et al. 2019

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Two Bio‐Argo floats measured the concentration of chlorophyll‐a, the backscattering coefficient, the fluorescence of humic‐like dissolved organic matter, dissolved oxygen, and temperature and salinity in the northern and central basins of the South China Sea for over 2 years. Temporal evolutions of bio‐optical properties were analyzed at surface, subsurface, and in the whole water column, respectively. It was found that (1) The seasonal variability of the surface chlorophyll‐a was highly controlled by photoacclimation, especially in the central basin; (2) backscattering in the upper 150 m was nearly constant, exhibiting no distinct seasonality; (3) with vertical mixing, particles from the deep chlorophyll maxima were entrained into the mixed layer resulting in enhanced surface chlorophyll during the early winter. This phenomenon may mislead a study based on satellite data which is likely to interpret it as blooming rather than a redistribution of phytoplankton within the water column; (4) analysis of a winter bloom and an anticyclonic eddy reveal that physical entrainment and biological photoacclimation modulated the vertical distributions of chlorophyll‐a and particles and potentially also changes of phytoplankton community composition; and (5) fluorescent dissolved organic matter was found to be highly coupled to phytoplankton dynamics in both basins, with a maximum (after removing the contribution of physical convective mixing) located at the depth of chlorophyll‐a subsurface maximum.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

et al. 2019

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“…2.4). Although positive spikes likely indicate the occurrence of large aggregates and are essential to monitoring carbon fluxes towards the deep ocean (Briggs et al, 2011), they can introduce some noise when export of particulate organic carbon due to small particles (Dall'Olmo and Mork, 2014), the physiological status of the algal community (Barbieux et al, 2017b), or the bio-optical behavior of world's oceans ) is analyzed. Both versions of b bp (700) profiles are archived in BOPAD-prof.…”

Section: Quality-controlled Vertical Profilesmentioning

confidence: 99%

“…For specific examples based on same PROVOR CTS4 profiling floats included in this study, the reader is referred to the works by Dall'Olmo and Mork (2014) and for estimation and analysis of particulate organic carbon concentrations and fluxes; Lacour et al (2017), Mignot et al (2017), and Stanev et al (2017) for observing the impact of physical drivers on biology; and Organelli et al (2017) and Barbieux et al (2017b) for analysis of the variability in diffuse attenuation coefficients for downward irradiance and particulate optical backscattering-to-chlorophyll ratios across different oceanic areas, respectively. It is worth noting that the latter two studies have been pursued by exclusively exploiting BOPAD-surf and BOPAD-prof.…”

Section: Conclusion and Recommendations For Usementioning

confidence: 99%

Two databases derived from BGC-Argo float measurements for marine biogeochemical and bio-optical applications

Organelli

Barbieux

Claustre

et al. 2017

Earth Syst. Sci. Data

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Abstract. Since 2012, an array of 105 Biogeochemical-Argo (BGC-Argo) floats has been deployed across the world's oceans to assist in filling observational gaps that are required for characterizing open-ocean environments. Profiles of biogeochemical (chlorophyll and dissolved organic matter) and optical (single-wavelength particulate optical backscattering, downward irradiance at three wavelengths, and photosynthetically available radiation) variables are collected in the upper 1000 m every 1 to 10 days. The database of 9837 vertical profiles collected up to January 2016 is presented and its spatial and temporal coverage is discussed. Each variable is quality controlled with specifically developed procedures and its time series is quality-assessed to identify issues related to biofouling and/or instrument drift. A second database of 5748 profile-derived products within the first optical depth (i.e., the layer of interest for satellite remote sensing) is also presented and its spatiotemporal distribution discussed. This database, devoted to field and remote ocean color applications, includes diffuse attenuation coefficients for downward irradiance at three narrow wavebands and one broad waveband (photosynthetically available radiation), calibrated chlorophyll and fluorescent dissolved organic matter concentrations, and singlewavelength particulate optical backscattering. To demonstrate the applicability of these databases, data within the first optical depth are compared with previously established bio-optical models and used to validate remotely derived bio-optical products. The quality-controlled databases are publicly available from the SEANOE (SEA scieNtific Open data Edition) publisher at https://doi.org/10.17882/49388 and https://doi.org/10.17882/47142 for vertical profiles and products within the first optical depth, respectively.

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“…Due to a factory calibration bias in the Chl a estimation from fluorescence, a correction factor of 0.5 was applied over the global ocean database for WETLABS ECO series Chl fluorometers after having compared fluorescence-derived values with the ones obtained by high performance liquid chromatography -HPLC (Roesler et al, 2017;Barbieux et al, 2018;Organelli et al, 2017).…”

mentioning

confidence: 99%

Merging bio-optical data from Biogeochemical-Argo floats and models in marine biogeochemistry

Terzić¹,

Lazzari²,

Organelli³

et al. 2018

Preprint

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Abstract. The present work is based on a dataset comprised of 31 Biogeochemical (BGC) Argo floats that collected 0-1000 m vertical profiles of biogeochemical and optical data from 2012 to 2016 in the Mediterranean Sea. The dataset was integrated in 1-dimensional model simulations following the trajectories of each float and considering measured photosynthetically avail-5 able radiation (PAR) profiles as the reference light parameterization. The simulations were aimed to be consistent with data measured by float sensors, especially in terms of the deep chlorophyll maximum (DCM) depth. Moreover, we tested several light models in order to estimate their impact on modeled biogeochemical properties, including self-shading dynamics based on chlorophyll and colored dissolved organic matter (CDOM) concentrations. The results, evaluated with the corresponding in-situ BGC-Argo chlorophyll data, indicate that the proposed approach allows to properly simulate the chlorophyll dynamics 10 and illustrate how PAR and vertical mixing are essential environmental regulation factors driving primary producers dynamics.The higher skills are reached using in-situ PAR, but some of the alternative bio-optical models here presented show comparable skill in reproducing DCM depth spatial variability. Simulation results show that during the stratification phase the diel cycle has significant impact on the surface chlorophyll regimes. The approach here presented serves as a computationally smooth solution to analyse BGC-Argo floats data and to corroborate hypotheses on their spatio-temporal variability.

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Assessing the Variability in the Relationship Between the Particulate Backscattering Coefficient and the Chlorophyll a Concentration From a Global Biogeochemical‐Argo Database

Cited by 69 publications

References 145 publications

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

Two databases derived from BGC-Argo float measurements for marine biogeochemical and bio-optical applications

Merging bio-optical data from Biogeochemical-Argo floats and models in marine biogeochemistry

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