Pan-Arctic optical characteristics of colored dissolved organic matter: Tracing dissolved organic carbon in changing Arctic waters using satellite ocean color data

Matsuoka, Atsushi; Boss, Emmanuel; Babin, Marcel; Karp‐Boss, Lee; Hafez, Mark A.; Alex, Chekalyuk; Proctor, Christopher A.; Werdell, P. Jeremy; Bricaud, Annick

doi:10.1016/j.rse.2017.08.009

Cited by 47 publications

(46 citation statements)

References 68 publications

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“…The highest a CDOM (350) values in AW in 2013, 0.28 ± 0.07 m −1 (Table 2), were similar to Hancke et al (2014) north of the Polar Front in the Barents Sea. Very low values of a CDOM (443) aligned with previous reports: in the core AW in the Greenland Sea measured during TARA expedition in 2013 (Matsuoka et al, 2017), in the eastern Fram Strait , in the Barents Sea (Hancke et al, 2014), and north of Svalbard (Kowalczuk et al, 2017). It should be underlined that data comparison could be biased by the number of observations, as this study documented a CDOM (350) and a CDOM (443) statistics based on a significantly higher number of samples and wider spatial coverage compared to the sources cited above.…”

Section: Variability In and Spectral Properties Of Cdom In The Nordicsupporting

confidence: 87%

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: Variability In and Spectral Properties Of Cdom In The Nordicsupporting

confidence: 87%

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

et al. 2018

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“…Depending on the excitation and emission wavelengths of the sensor, FDOM can be a proxy of concentrations of freshly produced material or more aged humic substances (Nelson and Gauglitz, 2016). However, in some regions, FDOM can be significantly correlated to a dg (λ) and thus be retrievable from ocean color remote sensing (e.g., Matsuoka et al, 2017). FDOM data included in BOPADsurf also represent a useful resource to improve the understanding of the optical behavior of the oceans .…”

Section: Bopad-prof: Spatiotemporal Distribution Of the Biogeochemicamentioning

confidence: 99%

Two databases derived from BGC-Argo float measurements for marine biogeochemical and bio-optical applications

Organelli

Barbieux

Claustre

et al. 2017

Earth Syst. Sci. Data

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Abstract. Since 2012, an array of 105 Biogeochemical-Argo (BGC-Argo) floats has been deployed across the world's oceans to assist in filling observational gaps that are required for characterizing open-ocean environments. Profiles of biogeochemical (chlorophyll and dissolved organic matter) and optical (single-wavelength particulate optical backscattering, downward irradiance at three wavelengths, and photosynthetically available radiation) variables are collected in the upper 1000 m every 1 to 10 days. The database of 9837 vertical profiles collected up to January 2016 is presented and its spatial and temporal coverage is discussed. Each variable is quality controlled with specifically developed procedures and its time series is quality-assessed to identify issues related to biofouling and/or instrument drift. A second database of 5748 profile-derived products within the first optical depth (i.e., the layer of interest for satellite remote sensing) is also presented and its spatiotemporal distribution discussed. This database, devoted to field and remote ocean color applications, includes diffuse attenuation coefficients for downward irradiance at three narrow wavebands and one broad waveband (photosynthetically available radiation), calibrated chlorophyll and fluorescent dissolved organic matter concentrations, and singlewavelength particulate optical backscattering. To demonstrate the applicability of these databases, data within the first optical depth are compared with previously established bio-optical models and used to validate remotely derived bio-optical products. The quality-controlled databases are publicly available from the SEANOE (SEA scieNtific Open data Edition) publisher at https://doi.org/10.17882/49388 and https://doi.org/10.17882/47142 for vertical profiles and products within the first optical depth, respectively.

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“…Errors of intercept, slope, and a CDOM (443) were propagated into the in situ (empirical) DOC vs. a CDOM (443) relationship. This resulted in a mean uncertainty of the tDOC concentration estimates of 28 % (see Appendix A2 of Matsuoka et al, 2017). Scene images of tDOC concentrations were used to make monthly composite images at 1 km horizontal resolution of the Mackenzie Shelf in the Canadian Beaufort Sea (Fig.…”

Section: Remote Sensing Datamentioning

confidence: 99%

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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Pan-Arctic optical characteristics of colored dissolved organic matter: Tracing dissolved organic carbon in changing Arctic waters using satellite ocean color data

Cited by 47 publications

References 68 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

Two databases derived from BGC-Argo float measurements for marine biogeochemical and bio-optical applications

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

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