UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009

Para, J.; Charrìère, Bruno; Matsuoka, Atsushi; Miller, William L.; Rontani, Jean‐François; Sempéré, Richard

doi:10.5194/bg-10-2761-2013

Cited by 31 publications

(33 citation statements)

References 58 publications

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“…Such a pattern observed for tDOC is also reported for terrigenous particulate organic matter (Doxaran et al, 2015). Further offshore on the Mackenzie Shelf, as delimited by the 300 m isobaths, both remotely sensed and simulated concentrations of tDOC were within the range of values measured in spring (∼ 110-230 mmol C m −3 ; Osburn et al, 2009) and summer (∼ 60-100 mmol C m −3 ; Para et al, 2013). The simulated values of tDOC were higher than those remotely sensed on the outer and off the shelf.…”

Section: Tdoc Concentrations and Distributionsupporting

confidence: 76%

Towards an assessment of riverine dissolved organic carbon in surface waters of the western Arctic Ocean based on remote sensing and biogeochemical modeling

Fouest

Matsuoka²,

Manizza

et al. 2018

Biogeosciences

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Abstract. Future climate warming of the Arctic could potentially enhance the load of terrigenous dissolved organic carbon (tDOC) of Arctic rivers due to increased carbon mobilization within watersheds. A greater flux of tDOC might impact the biogeochemical processes of the coastal Arctic Ocean (AO) and ultimately its capacity to absorb atmospheric CO 2 . In this study, we show that sea-surface tDOC concentrations simulated by a physical-biogeochemical coupled model in the Canadian Beaufort Sea for 2003-2011 compare favorably with estimates retrieved by satellite imagery. Our results suggest that, over spring-summer, tDOC of riverine origin contributes to 35 % of primary production and that an equivalent of ∼ 10 % of tDOC is exported westwards with the potential of fueling the biological production of the eastern Alaskan nearshore waters. The combination of model and satellite data provides promising results to extend this work to the entire AO so as to quantify, in conjunction with in situ data, the expected changes in tDOC fluxes and their potential impact on the AO biogeochemistry at basin scale.

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Section: Tdoc Concentrations and Distributionsupporting

confidence: 76%

Towards an assessment of riverine dissolved organic carbon in surface waters of the western Arctic Ocean based on remote sensing and biogeochemical modeling

Fouest

Matsuoka²,

Manizza

et al. 2018

Biogeosciences

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“…Yamashita et al (2017) Gonçalves-Araujo et al (2015) in the Lena River delta at the Siberian Shelf and by Pavlov et al (2016) near the Northern Dvina River outlet in the White Sea. The impact of the humic-like FDOM component on DOM composition decreased with increased distance from freshwater sources and increased salinity, where the protein-like FDOM fraction became dominant, for example, outside of the McKenzie River plume in the Beaufort Sea (Para et al, 2013) and in the White Sea . In the Fram Strait the distribution of humic-like fluorescence (ex.…”

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

confidence: 99%

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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“…Most previous studies on the origin, distribution and degradation of DOM and how it influences the optical properties of CDOM have been undertaken in oceans (Andrew et al, 2013;Matsuoka et al, 2014;Hancke et al, 2014;D'Sa et al, 2014), coastal waters (Stedmon et al, 2000;Vantrepotte et al, 2007;Kutser et al, 2009;Para et al, 2013) or in highlatitude lakes (Ficek et al, 2011;Ylöstalo et al, 2014). Understandably, the bias towards high-latitude systems partly reflects the fact that this region contains a high density of humic-rich lakes.…”

Section: Optical Properties Of Cdommentioning

confidence: 99%

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

et al. 2017

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Abstract. The development and validation of remotesensing-based approaches for the retrieval of chromophoric dissolved organic matter (CDOM) concentrations requires a comprehensive understanding of the sources and magnitude of variability in the optical properties of dissolved material within lakes. In this study, spatial and seasonal variability in concentration and composition of CDOM and the origin of its variation was studied in Lake Balaton (Hungary), a large temperate shallow lake in central Europe. In addition, we investigated the effect of photobleaching on the optical properties of CDOM through in-lake incubation experiments. There was marked variability throughout the year in CDOM absorption in Lake Balaton (a CDOM (440) = 0.06-9.01 m −1 ). The highest values were consistently observed at the mouth of the main inflow (Zala River), which drains humic-rich material from the adjoining Kis-Balaton wetland, but CDOM absorption decreased rapidly towards the east where it was consistently lower and less variable than in the westernmost lake basins. The spectral slope parameter for the interval of 350-500 nm (S CDOM (350-500)) was more variable with increasing distance from the inflow (observed range 0.0161-0.0181 nm −1 for the mouth of the main inflow and 0.0158-0.0300 nm −1 for waters closer to the outflow). However, spatial variation in S CDOM was more constant exhibiting a negative correlation with a CDOM (440). Dissolved organic carbon (DOC) was strongly positively correlated with a CDOM (440) and followed a similar seasonal trend but it demonstrated more variability than either a CDOM or S CDOM with distance through the system. Photobleaching resulting from a 7-day exposure to natural solar UV radiation resulted in a marked decrease in allochthonous CDOM absorption (7.04 to 3.36 m −1 , 42 % decrease). Photodegradation also resulted in an increase in the spectral slope coefficient of dissolved material.

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UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009

Cited by 31 publications

References 58 publications

Towards an assessment of riverine dissolved organic carbon in surface waters of the western Arctic Ocean based on remote sensing and biogeochemical modeling

Towards an assessment of riverine dissolved organic carbon in surface waters of the western Arctic Ocean based on remote sensing and biogeochemical modeling

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

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

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