Colored dissolved organic matter dynamics across the shelf‐basin interface in the western Arctic Ocean

Guéguen, Céline; Guo, Laodong; Yamamoto‐Kawai, Michiyo; Тanaka, Noriyuki

doi:10.1029/2006jc003584

Cited by 69 publications

(90 citation statements)

References 72 publications

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“…The CDOM fluorescence is a good tracer of the Arctic Ocean terrigenous organic matter primarily attributed to the Eurasian and American continental runoff water (e.g., Granskog et al, 2012) as well as to interactions with sediments on the Arctic shelves (e.g., Guéguen et al, 2007). The CDOM fluorescence maxima in the halostad at station SN15-13 is consistent with results from the Canada Basin where this maxima is attributed to the winter PcW (e.g., Guéguen et al, 2007) and the continental river runoff water (e.g., Granskog et al, 2012). For the downstream NEW area, Amon et al (2003) also reported the intermediate maxima of the CDOM fluorescence through the shelf halostad layer (Fig.…”

Section: Tracing the Origin Of The Wandel Sea Halostad Halocline Andmentioning

confidence: 99%

Arctic Ocean outflow and glacier–ocean interactions modify water over the Wandel Sea shelf (northeastern Greenland)

et al. 2017

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Abstract. The first-ever conductivity-temperaturedepth (CTD) observations on the Wandel Sea shelf in northeastern Greenland were collected in April-May 2015. They were complemented by CTDs taken along the continental slope during the Norwegian FRAM 2014-2015 drift. The CTD profiles are used to reveal the origin of water masses and interactions with ambient water from the continental slope and the tidewater glacier outlet. The subsurface water is associated with the Pacific water outflow from the Arctic Ocean. The underlying halocline separates the Pacific water from a deeper layer of polar water that has interacted with the warm Atlantic water outflow through the Fram Strait, recorded below 140 m. Over the outer shelf, the halocline shows numerous cold density-compensated intrusions indicating lateral interaction with an ambient polar water mass across the continental slope. At the front of the tidewater glacier outlet, colder and turbid water intrusions were observed at the base of the halocline. On the temperature-salinity plots these stations indicate a mixing line that is different from the ambient water and seems to be conditioned by the ocean-glacier interaction. Our observations of Pacific water are set within the context of upstream observations in the Beaufort Sea and downstream observations from the Northeast Water Polynya, and clearly show the modification of Pacific water during its advection across the Arctic Ocean. Moreover, ambient water over the Wandel Sea slope shows different thermohaline structures indicating the different origin and pathways of the on-shore and off-shore branches of the Arctic Ocean outflow through the western Fram Strait.

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Section: Tracing the Origin Of The Wandel Sea Halostad Halocline Andmentioning

confidence: 99%

Arctic Ocean outflow and glacier–ocean interactions modify water over the Wandel Sea shelf (northeastern Greenland)

et al. 2017

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“…In the Mackenzie Delta and North West sectors (salinity < 25), the concentrations reflect the mixing process of the Mackenzie's terrestrial input, except locally (station 394) where primary production enhanced both DOC and a CDOM (350), while in the saltiest surface waters (North East Sector), autochthonous DOM appears to dominate. Sea ice formation/brine rejection and upwelling processes are common physical features in this salty area and have the capacity to both deliver new DOM and enhance surface in situ production of DOM (Carmack and Macdonald, 2002;Barber and Hanesiak, 2004;Guéguen et al, 2007;Walker et al, 2009;Mucci et al, 2010). Additional CDOM could be produced by zooplankton and bacterioplankton communities (Nelson et al, 2004).…”

Section: Dissolved Organic Carbon (Doc) and Chromophoric Dommentioning

confidence: 99%

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

et al. 2013

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Surface waters from the Beaufort Sea in the Arctic Ocean were evaluated for dissolved organic carbon (DOC), and optical characteristics including UV (ultraviolet) radiation and PAR (photosynthetically active radiation) diffuse attenuation (K_d), and chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) as part of the MALINA field campaign (30 July to 27 August). Spectral absorption coefficients (a_CDOM (350 nm) (m⁻¹)) were significantly correlated to both diffuse attenuation coefficients (K_d) in the UV-A and UV-B and to DOC concentrations. This indicates CDOM as the dominant attenuator of both UV and PAR solar radiation and suggests its use as an optical proxy for DOC concentrations in this region. While the Mackenzie input is the main driver of CDOM dynamics in low salinity waters, locally, primary production can create significant increases in CDOM. Extrapolating CDOM to DOC relationships, we estimate that ∼16% of the DOC in the Mackenzie River does not absorb radiation at 350 nm. The discharges of DOC and its chromophoric subset (CDOM) by the Mackenzie River during the MALINA cruise are estimated as ∼0.22 TgC and 0.18 TgC, respectively. Three dissolved fluorescent components (C1–C3) were identified by fluorescence excitation/emission matrix spectroscopy (EEMS) and parallel factor (PARAFAC) analysis. Our results showed an aquatic dissolved organic matter (DOM) component (C1), probably produced in the numerous lakes of the watershed, that co-dominated with a terrestrial humic-like component (C2) in the Mackenzie Delta Sector. This aquatic DOM could partially explain the high CDOM spectral slopes observed in the Beaufort Sea

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“…The humic substances contribute significantly both to the CDOM pool in the water column as well as to surfactant concentrations, especially in coastal ocean, estuaries and semi-enclosed marine basins that are impacted by terrestrial runoff and marine traffic. Therefore optical methods could be used efficiently to determine of natural and anthropogenic organic surface active substances in the SML (Drozdowska et al Pereira et al, 2016;Frew et al,2004;Zhang et al, 2009;McKnight et al, 1997;Guéguen et al, 2007).…”

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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Colored dissolved organic matter dynamics across the shelf‐basin interface in the western Arctic Ocean

Cited by 69 publications

References 72 publications

Arctic Ocean outflow and glacier–ocean interactions modify water over the Wandel Sea shelf (northeastern Greenland)

Arctic Ocean outflow and glacier–ocean interactions modify water over the Wandel Sea shelf (northeastern Greenland)

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

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

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