Optical properties of sediment pore waters of the Adriatic sea

Serittp, A.; Nannicini, L.; Vecchio, Rossana Del; Giordani, P.; Balboni, V.; Miserocchi, Stefano

doi:10.1080/02772249709358485

Cited by 10 publications

(9 citation statements)

References 35 publications

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“…These values indicate that near seabed CDOM was characterized by higher molecular weight than CDOM sampled in intermediate deep waters. This supports the hypothesis that DOM production and release occurs in the seabed sediment (first 0.3 m) (Burdige 2002;Burdige et al 2004;Seritti et al 1997). On the contrary, Shank et al (2005) shows an increase in CDOM spectral slope when sediment was added to water in laboratory experiments, presumably due to the flocculation of high molecular weight CDOM.…”

Section: Relationships Between Field Chlorophyll a And Cdom Optical Psupporting

confidence: 77%

Sensitivity analysis of CDOM spectral slope in artificial and natural samples: an application in the central eastern Mediterranean Basin

et al. 2010

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In the past two decades, optical properties of chromophoric dissolved organic matter (CDOM) in marine environments have been extensively studied. Many of these studies report CDOM properties for the offshore environment where this complex mixture of optically active compounds is strongly diluted. Nevertheless, autochthonous and allochthonous sources have been identified and sinks related to photodegradation and bacterial activity have been demonstrated. The calculation of the spectral slope of the CDOM absorption curve has been proven to be useful and is often reported. However, a rigorous uncertainty analysis of the slope calculation is rarely reported. In this paper, we propose a method to evaluate the uncertainty of CDOM spectral slope calculated between 270 and 400 nm, using both naturally sampled and artificial solutions. We use these results to study the ultra-oligotrophic waters of the Mediterranean Sea (central eastern basin), where little is known about CDOM spatial distribution. We show that dilutions of both artificial and natural samples produce a Gaussian distribution of spectral slopes, indicating that consistent values may be determined, with a typical uncertainty of ±0.0004 nm -1 when absorption at 300 nm was greater then 0.1 m -1 (0.1 m pathlength). Comparing the distribution of spectral slopes from central eastern basin samples to a Gaussian distribution, we show differences between measurements that were significantly different. These values allow us to distinguish possible sources (algal derived CDOM), sinks (e.g. photo-bleaching) at different depths. We propose a subdivision of CDOM compounds into refractory and semilabile/refractory pools and evaluate the CDOM spectral slope of algal derived CDOM released at or near deep chlorophyll maximum.

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Section: Relationships Between Field Chlorophyll a And Cdom Optical Psupporting

confidence: 77%

Sensitivity analysis of CDOM spectral slope in artificial and natural samples: an application in the central eastern Mediterranean Basin

et al. 2010

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“…A positive correlation between humic-like fluorescence intensity and DOC appears to be the norm in pore waters (e.g., Chen et al, 1993;Seretti et al, 1997;Sierra et al, 2001;Skoog et al, 1996). This is in contrast to water column FDOM, where this relationship can be of an inverse nature depending on the area of study (Coble, 2007).…”

Section: B Fluorescence Spectroscopymentioning

confidence: 79%

“…Fluorescence spectroscopy has been applied to pore water DOM in a variety of environments including estuarine and marine sediments (Benamou et al, 1994;Burdige et al, 2004;Chen and Bada, 1989;Chen and Bada, 1994;Chen et al, 1993;Coble, 1996;Komada et al, 2004;Komada et al, 2002;Seretti et al, 1997;Sierra et al, 2001;Skoog et al, 1996), intertidal sand flats and subterranean estuaries (Kim et al, 2012;Lübben et al, 2009), mangrove and salt marsh sediments (Marchand et al, 2006;Otero et al, 2007), and deep-sea coral mounds (Larmagnat and Neuweiler, 2011). These studies examined properties of fluorescent DOM (FDOM) through the determination of fluorescence intensity at fixed excitation and emission wavelengths, emission spectra at a limited number of excitation wavelengths, synchronous scan spectra, or full three-dimensional excitation-emission matrix (EEM) spectra.…”

Section: B Fluorescence Spectroscopymentioning

confidence: 99%

Sediment Pore Waters

Burdige¹,

Komada²

2015

Biogeochemistry of Marine Dissolved Organic Matter

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“…Data were expressed as absorption coefficients: a = 2.303A /l, where A is the absorbance at a given wavelength and l is the pathlength in meters. On the basis of the previous findings (Seritti et al, 1994a(Seritti et al, , 1994b(Seritti et al, , 1996(Seritti et al, , 1997, two main groups of chromophoric material were investigated by detecting the absorption coefficients at 280 nm and 355 nm, respectively. The apparent specific absorption a * were calculated by the relation: a* = a /DOC where DOC is expressed as mg L -1 .…”

Section: Absorption Measurementsmentioning

confidence: 99%

“…In a previous paper of ours (Seritti et al, 1997), the occurrence of two main groups of fluorophores in pore waters of sediments collected in the Adriatic Sea were recognized. Correlation between optical properties and DOC allowed a reaction pathway of the sedimentary organic matter to be postulated.…”

Section: Introductionmentioning

confidence: 99%