Fluorescence measured in situ as a proxy of CDOM absorption and DOC concentration in the Baltic Sea

Kowalczuk, Piotr; Zabłocka, Monika; Sagan, Sławomir; Kuliński, Karol

doi:10.5697/oc.52-3.431

Cited by 84 publications

(67 citation statements)

References 57 publications

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“…In situ fluorometry provided an opportunity to study FDOM distribution in greater detail and commercially available FDOM fluorometers are usually built to detect humic substances Belzile et al, 2006;Kowalczuk et al, 2010;Aiken et al, 2011;Loginova et al, 2016). In this study we simultaneously measured three different FDOM components, and the most interesting feature observed with the use of this new instrument was very significant spatial coupling between I CH3 and I FChla .…”

Section: Distribution Of Fdom Components In the Ocean And Their Depenmentioning

confidence: 77%

“…Based on excitation-emission spectra fluorescence spectroscopy, it is possible to distinguish amidst different origin groups of fluorophores, e.g., terrestrial, marine, and anthropogenic Murphy et al, 2013Murphy et al, , 2014. Use of in situ DOM fluorometers enables low cost and high sample rate observations of the distribution of FDOM and related biogeochemical proxies with greater temporal and spatial resolution (Belzile et al, 2006;Kowalczuk et al, 2010).…”

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confidence: 99%

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Characteristics of chromophoric and fluorescent dissolved organic matter in the Nordic Seas

et al. 2018

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Abstract. Optical properties of chromophoric (CDOM) and fluorescent dissolved organic matter (FDOM) were characterized in the Nordic Seas including the West Spitsbergen Shelf during June-July 2013, 2014, and 2015. The CDOM absorption coefficient at 350 nm, a CDOM (350) showed significant interannual variation (T test, p < 0.00001). In 2013, the highest average a CDOM (350) values (a CDOM (350) = 0.30 ± 0.12 m −1 ) were observed due to the influence of cold and low-salinity water from the Sørkapp Current (SC) in the southern part of the West Spitsbergen Shelf. In 2014, a CDOM (350) values were significantly lower (T test, p < 0.00001) than in 2013 (average a CDOM (350) = 0.14 ± 0.06 m −1 ), which was associated with the dominance of warm and saline Atlantic Water (AW) in the region, while in 2015 intermediate CDOM absorption (average a CDOM (350) = 0.19 ± 0.05 m −1 ) was observed. In situ measurements of three FDOM components revealed that fluorescence intensity of protein-like FDOM dominated in the surface layer of the Nordic Seas. Concentrations of marine and terrestrial humic-like DOM were very low and distribution of those components was generally vertically homogenous in the upper ocean (0-100 m). Fluorescence of terrestrial and marine humic-like DOM decreased in surface waters (0-15 m) near the sea ice edge due to dilution of oceanic waters by sea ice meltwater. The vertical distribution of protein-like FDOM was characterized by a prominent subsurface maximum that matched the subsurface chlorophyll a maximum and was observed across the study area. The highest protein-like FDOM fluorescence was observed in the Norwegian Sea in the core of warm AW. There was a significant relationship between the proteinlike fluorescence and chlorophyll a fluorescence (R 2 = 0.65, p < 0.0001, n = 24 490), which suggests that phytoplankton was the primary source of protein-like DOM in the Nordic Seas and West Spitsbergen Shelf waters. Observed variability in selected spectral indices (spectral slope coefficient, S 300-600 , carbon-specific CDOM absorption coefficient at 254 and 350 nm, SUVA 254 , a * CDOM (350)) and the nonlinear relationship between CDOM absorption and the spectral slope coefficient also indicate a dominant marine (autochthonous) source of CDOM and FDOM in the study area. Further, our data suggest that a CDOM (350) cannot be used to predict dissolved organic carbon (DOC) concentrations in the study region; however the slope coefficient (S 300-600 ) shows some promise in being used.

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Section: Distribution Of Fdom Components In the Ocean And Their Depenmentioning

confidence: 77%

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confidence: 99%

Characteristics of chromophoric and fluorescent dissolved organic matter in the Nordic Seas

et al. 2018

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“…CDOM absorption coefficient (a CDOM (λ)) and DOC concentration are highly correlated with each other in regions where the mixing of fresh and oceanic waters control the variability of each parameter and terrestrial dominance is strong [29]. These conditions have enabled satellite estimates of DOC using the relationship between CDOM-DOC and CDOM-R rs band ratios [7,22].…”

Section: Introductionmentioning

confidence: 99%

Chromophoric Dissolved Organic Matter and Dissolved Organic Carbon from Sea-Viewing Wide Field-of-View Sensor (SeaWiFS), Moderate Resolution Imaging Spectroradiometer (MODIS) and MERIS Sensors: Case Study for the Northern Gulf of Mexico

et al. 2013

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Empirical band ratio algorithms for the estimation of colored dissolved organic matter (CDOM) and dissolved organic carbon (DOC) for Sea-viewing Wide Field-of-view Sensor (SeaWiFS), Moderate Resolution Imaging Spectroradiometer (MODIS) and MERIS ocean color sensors were assessed and developed for the northern Gulf of Mexico. Match-ups between in situ measurements of CDOM absorption coefficients at 412 nm (a CDOM (412)) with that derived from SeaWiFS were examined using two previously reported reflectance band ratio algorithms. Results indicate better performance using the R rs (510)

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“…Maximum freshwater runoff occurs in April-May. The freshwater carries both high concentrations of CDOM (Drozdowska and Kowalczuk, 1999;Kowalczuk, 1999;Kowalczuk et al, 2010;Ylostallo et al, 2016) and substantial loads of anthropogenic pollutants and inorganic nutrients (Drozdowska et al, 2002;Pastuszak et al, 2012) that stimulate phytoplankton blooms. This marine basin is also impacted by significant pollution caused by the high marine traffic (Konik and Bradtke, 2016).…”

Section: Introductionmentioning

confidence: 99%

Study on organic matter fractions in the surface microlayer in the Baltic Sea by spectrophotometric and spectrofluorometric methods

et al. 2017

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Abstract. The fluorescence and absorption measurements of the samples collected from a surface microlayer (SML) and a subsurface layer (SS), at a depth of 1 m, were studied during three research cruises in the Baltic Sea along with hydrophysical studies and meteorological observations. Several absorption (E 2 : E 3 , S, S R ) and fluorescence (fluorescence intensities at Coble classified peaks: A, C, M, T the ratio (M + T ) / (A + C) , HIX (humification index)) indices of colored and fluorescent dissolved organic matter (CDOM and FDOM) helped to describe the changes in molecular size and weight as well as in composition of organic matter. The investigation allowed the assessment of a decrease in the contribution of two terrestrial components (A and C) with increasing salinity (∼ 1.64 and ∼ 1.89 % in the SML and ∼ 0.78 and ∼ 0.71 % in the SS, respectively) and an increase in components produced in situ (M and T ) with salinity (∼ 0.52 and ∼ 2.83 % in the SML and ∼ 0.98 and ∼ 1.87 % in the SS, respectively). Hence, a component T reveals the biggest relative changes along the transect from the Vistula River outlet to Gdansk Deep, in both the SML and SS, although an increase was higher in the SML than in the SS (∼ 18.5 and ∼ 12.3 %, respectively). The ratio E 2 : E 3 points to greater changes in the molecular weight of CDOM affected by a higher rate of photobleaching in the SML. The HIX index reflects a more advanced stage of humification and condensation processes in the SS. Finally, the results reveal a higher rate of degradation processes occurring in the SML than in the SS. Thus, the specific physical properties of surface active organic molecules (surfactants) may modify, in a specific way, the solar light spectrum entering the sea and a penetration depth of the solar radiation. Research on the influence of surfactants on the physical processes linked to the sea surface becomes an important task, especially in coastal waters and in the vicinity of the river mouths.

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Fluorescence measured in situ as a proxy of CDOM absorption and DOC concentration in the Baltic Sea

Cited by 84 publications

References 57 publications

Characteristics of chromophoric and fluorescent dissolved organic matter in the Nordic Seas

Characteristics of chromophoric and fluorescent dissolved organic matter in the Nordic Seas

Chromophoric Dissolved Organic Matter and Dissolved Organic Carbon from Sea-Viewing Wide Field-of-View Sensor (SeaWiFS), Moderate Resolution Imaging Spectroradiometer (MODIS) and MERIS Sensors: Case Study for the Northern Gulf of Mexico

Study on organic matter fractions in the surface microlayer in the Baltic Sea by spectrophotometric and spectrofluorometric methods

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