CDOM fluorescence as a proxy of DOC concentration in natural waters: a comparison of four contrasting tropical systems

Rochelle-Newall, Emma; Hulot, Florence D.; Janeau, Jean‐Louis; Merroune, A.

doi:10.1007/s10661-013-3401-2

Cited by 50 publications

(27 citation statements)

References 28 publications

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“…Therefore, a strong relationship between CDOM and DOC may not exist for the open ocean, dominated by marine autochtonously produced CDOM [cf. Siegel et al, 2002;Rochelle-Newall et al, 2014]. In contrast, in areas strongly influenced by inputs of terrestrial dissolved organic matter, significant positive relationships have been found between CDOM and DOC [e.g., Spencer et al, 2009;Fichot and Benner, 2012].…”

Section: Properties and Origin Of Cdom During Experimentsmentioning

confidence: 99%

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO₂ levels

et al. 2014

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A large-scale multidisciplinary mesocosm experiment in an Arctic fjord (Kongsfjorden, Svalbard; 78°56.2′N) was used to study Arctic marine food webs and biogeochemical elements cycling at natural and elevated future carbon dioxide (CO 2 ) levels. At the start of the experiment, marine-derived chromophoric dissolved organic matter (CDOM) dominated the CDOM pool. Thus, this experiment constituted a convenient case to study production of autochthonous CDOM, which is typically masked by high levels of CDOM of terrestrial origin in the Arctic Ocean proper. CDOM accumulated during the experiment in line with an increase in bacterial abundance; however, no response was observed to increased pCO 2 levels. Changes in CDOM absorption spectral slopes indicate that bacteria were most likely responsible for the observed CDOM dynamics. Distinct absorption peaks (at~330 and~360 nm) were likely associated with mycosporine-like amino acids (MAAs). Due to the experimental setup, MAAs were produced in absence of ultraviolet exposure providing evidence for MAAs to be considered as multipurpose metabolites rather than simple photoprotective compounds. We showed that a small increase in CDOM during the experiment made it a major contributor to total absorption in a range of photosynthetically active radiation (PAR, 400-700 nm) and, therefore, is important for spectral light availability and may be important for photosynthesis and phytoplankton groups composition in a rapidly changing Arctic marine ecosystem.

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Section: Properties and Origin Of Cdom During Experimentsmentioning

confidence: 99%

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO₂ levels

et al. 2014

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“…Substances that are excited in the UV spectral range, but emit in the visible spectral range were identified as fulvic-and humic-like FDOM components [Coble, 1996;Gu eguen and Kowalczuk, 2013] and have been related to semirefractory or refractory DOM [Coble, 1996].Optically active DOM may be used for carbon assessment in aquatic systems, where DOM cycling is controlled by conservative mixing. Thus, CDOM absorption has been used to estimate DOC concentrations in field studies [Fichot and Benner, 2012;Rochelle-Newall et al, 2014]. In remote sensing techniques, light attenuation is used by satellites to derive CDOM signal, and, by assuming a direct relationship between CDOM absorption and DOC concentrations, the distribution of DOC in surface waters [Del Castillo, 2007].…”

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confidence: 99%

Chromophoric and fluorescent dissolved organic matter in and above the oxygen minimum zone off Peru

Loginova

Thomsen

Engel

2016

J. Geophys. Res. Oceans

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As a result of nutrient upwelling, the Peruvian coastal system is one of the most productive regions in the ocean. Sluggish ventilation of intermediate waters, characteristic for the Eastern Tropical South Pacific (ETSP) and microbial degradation of a high organic matter load promotes deoxygenation at depth. Dissolved organic matter (DOM) plays a key role in microbial respiration and carbon cycling, but little is known on DOM distribution and cycling in the ETSP. DOM optical properties give important insights on DOM sources, structure and biogeochemical reactivity. Here, we present data and a conceptual view on distribution and cycling of chromophoric (CDOM) and fluorescent (FDOM) DOM in and above the oxygen minimum zone (OMZ) off Peru. Five fluorescent components were identified during PARAFAC analysis. Highest intensities of CDOM and of the amino acid‐like fluorescent component (C3) occurred above the OMZ and coincided with maximum chl a concentrations, suggesting phytoplankton productivity as major source. High intensities of a marine humic‐like fluorescent component (C1), observed in subsurface waters, indicated in situ microbial reworking of DOM. FDOM release from inner shelf sediment was determined by seawater analysis and continuous glider sensor measurement and included a humic‐like component (C2) with a signature typical for terrestrially derived humic acids. Upwelling supplied humic‐like substances to the euphotic zone. Photo‐reactions were likely involved in the production of a humic‐like fluorescent component (C5). Our data show that variable biological and physical processes need to be considered for understanding DOM cycling in a highly dynamic coastal upwelling system like the ETSP off Peru.

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“…Around the timing of the phytoplankton bloom, as reported around DoY 123.5 (Fig 4) from MODIS-derived Chlorophyll-a values, our ADCP SPM data showed wisps of high backscatter in the upper water layers (up to a water depth of -20 m; 10 m above seabed). Other possible causes for this shallow backscatter anomaly were excluded: wave heights were around 0.5 m only, and the nearest ships were more than 4 km away; values for colour dissolved organic matter, as measured by the Wave Glider, and a useful proxy for debris from dead organic matter [60] were low too.…”

Section: Discussionmentioning

confidence: 99%

Wave Glider Monitoring of Sediment Transport and Dredge Plumes in a Shallow Marine Sandbank Environment

Lancker

Baeye

2015

PLoS ONE

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As human pressure on the marine environment increases, safeguarding healthy and productive seas increasingly necessitates integrated, time- and cost-effective environmental monitoring. Employment of a Wave Glider proved very useful for the study of sediment transport in a shallow sandbank area in the Belgian part of the North Sea. During 22 days, data on surface and water-column currents and turbidity were recorded along 39 loops around an aggregate-extraction site. Correlation with wave and tidal-amplitude data allowed the quantification of current- and wave-induced advection and resuspension, important background information to assess dredging impacts. Important anomalies in suspended particulate matter concentrations in the water column suggested dredging-induced overflow of sediments in the near field (i.e., dynamic plume), and settling of finer-grained material in the far field (i.e., passive plume). Capturing the latter is a successful outcome to this experiment, since the location of dispersion and settling of a passive plume is highly dependent on the ruling hydro-meteorological conditions and thus difficult to predict. Deposition of the observed sediment plumes may cause habitat changes in the long-term.

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CDOM fluorescence as a proxy of DOC concentration in natural waters: a comparison of four contrasting tropical systems

Cited by 50 publications

References 28 publications

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO₂ levels

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO₂ levels

Chromophoric and fluorescent dissolved organic matter in and above the oxygen minimum zone off Peru

Wave Glider Monitoring of Sediment Transport and Dredge Plumes in a Shallow Marine Sandbank Environment

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CDOM fluorescence as a proxy of DOC concentration in natural waters: a comparison of four contrasting tropical systems

Cited by 50 publications

References 28 publications

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO2 levels

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO2 levels

Chromophoric and fluorescent dissolved organic matter in and above the oxygen minimum zone off Peru

Wave Glider Monitoring of Sediment Transport and Dredge Plumes in a Shallow Marine Sandbank Environment

Contact Info

Product

Resources

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Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO₂ levels

Marine CDOM accumulation during a coastal Arctic mesocosm experiment: No response to elevated pCO₂ levels