Dissolved organic matter in the Lena River Delta Region, Siberia, Russia

Gonçalves-Araujo, Rafael; Stedmon, Colin; Heim, Birgit; Dubinenkov, Ivan; Kraberg, Alexandra; Моисеев, Д. В.; Bracher, Astrid

doi:10.1594/pangaea.844928

Cited by 4 publications

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“…Fritz et al (2023),Gonçalves-Araujo et al (2015b, 2023a, 2023b,Granskog et al (2020),Hansell (2017),Hansell et al (2021), Hölemann et al (2019a, 2019b, 2019c, 2019d,Hölemann et al (2020),Juhls, Lizotte et al, 2019, Juhls, Overduin, Gonçalves-Araujo et al, 2019, Juhls, Overduin, Hölemann, et al, 2019,Massicotte et al (2017),Nishioka et al (2020),Shiklomanov et al (2018), andTanaka et al (2016).…”

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A Pan‐Arctic Algorithm to Estimate Dissolved Organic Carbon Concentrations From Colored Dissolved Organic Matter Spectral Absorption

Gonçalves‐Araujo,

Granskog,

Osburn

et al. 2023

Geophysical Research Letters

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Sampling for dissolved organic carbon (DOC) in the Arctic is challenging given the limited access and because it is not yet possible to measure with instruments deployed in situ. Compared to DOC, colored dissolved organic matter (CDOM) absorption spectroscopy is an easy‐to‐measure, relatively quick and cost‐effective approach which is often closely related to DOC concentrations in water samples. Here we present an algorithm based on quantitative and qualitative metrics of CDOM to provide DOC estimates derived from a Pan‐Arctic data set (n = 3,302) spanning rivers to deep ocean, with DOC ranging between 31 and 1,958 μM. The algorithm provided robust DOC estimates (r2 = 0.94; p < 0.0001) and could reproduce DOC profiles and mixing plots across different locations in the Arctic Ocean. Besides its simplicity, this method is capable of capturing the extremely broad range of DOC within the strong gradients observed between Arctic riverine and marine systems.

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A Pan‐Arctic Algorithm to Estimate Dissolved Organic Carbon Concentrations From Colored Dissolved Organic Matter Spectral Absorption

Gonçalves‐Araujo,

Granskog,

Osburn

et al. 2023

Geophysical Research Letters

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Surface water Dissolved Organic Matter (DOC, CDOM) in the Lena River (2013)

Juhls¹,

Eulenburg²

2019

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From Fresh to Marine Waters: Characterization and Fate of Dissolved Organic Matter in the Lena River Delta Region, Siberia

et al. 2015

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Connectivity between the terrestrial and marine environment in the Artic is changing as a result of climate change, influencing both freshwater budgets, and the supply of carbon to the sea. This study characterizes the optical properties of dissolved organic matter (DOM) within the Lena Delta region and evaluates the behavior of DOM across the fresh water-marine gradient. Six fluorescent components (four humic-like; one marine humic-like; one protein-like) were identified by Parallel Factor Analysis (PARAFAC) with a clear dominance of allochthonous humic-like signals. Colored DOM (CDOM) and dissolved organic carbon (DOC) were highly correlated and had their distribution coupled with hydrographical conditions. Higher DOM concentration and degree of humification were associated with the low salinity waters of the Lena River. Values decreased toward the higher salinity Laptev Sea shelf waters. Results demonstrate different responses of DOM mixing in relation to the vertical structure of the water column, as reflecting the hydrographical dynamics in the region. Two mixing curves for DOM were apparent. In surface waters above the pycnocline there was a sharper decrease in DOM concentration in relation to salinity indicating removal. In the bottom water layer the DOM decrease within salinity was less. We propose there is a removal of DOM occurring primarily at the surface layer, which is likely driven by photodegradation and flocculation.

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Dissolved organic matter in the Lena River Delta Region, Siberia, Russia

Cited by 4 publications

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A Pan‐Arctic Algorithm to Estimate Dissolved Organic Carbon Concentrations From Colored Dissolved Organic Matter Spectral Absorption

A Pan‐Arctic Algorithm to Estimate Dissolved Organic Carbon Concentrations From Colored Dissolved Organic Matter Spectral Absorption

Surface water Dissolved Organic Matter (DOC, CDOM) in the Lena River (2013)

From Fresh to Marine Waters: Characterization and Fate of Dissolved Organic Matter in the Lena River Delta Region, Siberia

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