Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean

Letscher, Robert T.; Hansell, Dennis A.; Kadko, David

doi:10.1016/j.marchem.2010.10.002

Cited by 86 publications

(121 citation statements)

References 55 publications

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“…A similar removal pattern as found in our study was also reported for the Arctic region in the studies of Alling et al (2010) and Letscher et al (2011). For the Lena River discharge on the East Siberian Arctic Shelf, Alling et al (2010) calculated a DOC removal of up to 50 % before reaching the high salinity areas of the central Arctic Ocean giving a firstorder removal rate constant of 0.3 yr −1 .…”

Section: What Happens To Hmw-doc Ter In the Baltic Sea?supporting

confidence: 89%

“…For the Lena River discharge on the East Siberian Arctic Shelf, Alling et al (2010) calculated a DOC removal of up to 50 % before reaching the high salinity areas of the central Arctic Ocean giving a firstorder removal rate constant of 0.3 yr −1 . This rate was confirmed (0.24 ± 0.08) by a study in the Makarov and Eurasian basin in the Arctic by Letscher et al (2011). They observed a linear correlation between salinity (range 26 to 34) and the DOC concentration, and used their correlation together with an annual mean DOC concentration for the Arctic rivers to calculate a loss of 400 µmol l −1 DOC over the Arctic shelf system.…”

Section: What Happens To Hmw-doc Ter In the Baltic Sea?mentioning

confidence: 62%

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Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea ecosystem

et al. 2012

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Abstract. To test the hypothesis whether high molecular weight dissolved organic matter (HMW-DOM) in a high latitude marginal sea is dominated by terrestrial derived matter, 10 stations were sampled along the salinity gradient of the central and northern Baltic Sea and were analyzed for concentrations of dissolved organic carbon as well as δ 13 C values of HMW-DOM. Different end-member-mixing models were applied to quantify the influence of terrestrial DOM and to test for conservative versus non-conservative behavior of the terrestrial DOM in the different Baltic Sea basins. The share of terrestrial DOM to the total HMW-DOM was calculated for each station, ranging from 43 to 83 %. This shows the high influence of terrestrial DOM inputs for the Baltic Sea ecosystem. The data also suggest that terrestrial DOM reaching the open Baltic Sea is not subject to substantial removal anymore. However compared to riverine DOM concentrations, our results indicate that substantial amounts of HMW-DOM (> 50 %) seem to be removed near the coastline during estuarine mixing. A budget approach yielded residence times for terrestrial DOM of 2.8, 3.0, and 4.5 yr for the Bothnian Bay, the Bothnian Sea and the Baltic Proper.

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Section: What Happens To Hmw-doc Ter In the Baltic Sea?supporting

confidence: 89%

Section: What Happens To Hmw-doc Ter In the Baltic Sea?mentioning

confidence: 62%

Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea ecosystem

et al. 2012

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“…Assuming an annual mean mineralization rate of tDOC of ∼ 0.02 Tg C (Bélanger et al, 2006), this process would explain < 2 % of the reported tDOC difference in August. In addition, the 15 % value used to set the bioavailable tDOC fraction in the model was at the low end of values re- ported in other studies (up to 50 %; Mann et al, 2012;Wickland et al, 2012;Letscher et al, 2011;Alling et al, 2010;Holmes et al, 2008). This underestimation of the bioavailable fraction of tDOC upon delivery to the AO could be a major reason why the simulated values of tDOC were consistently overestimated when compared to satellite estimates for the outer shelf and offshore locations (Fig.…”

Section: Tdoc Stock and Lateral Export Fluxesmentioning

confidence: 79%

“…We provide here a brief description of the physical-biogeochemical coupled model used to generate the "RIV run". The MITgcm (MIT general circulation model) ocean-sea ice model (Nguyen et al, 2009(Nguyen et al, , 2011Losch et al, 2010;Condron et al, 2009) has a variable hor- (Menemenlis et al, 2005). Atmospheric forcings (10 m winds, 2 m air temperature and humidity, and downward long-and shortwave radiation) are taken from the 6-hourly data sets of the Japanese 25-year ReAnalysis (JRA-25; Onogi et al, 2007).…”

Section: -D Physical-biogeochemical Model 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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“…However, due to the complexity of environmental processes, the intensity of this feedback remains unclear (Schaefer et al, 2014;Schuur et al, 2015). Besides being released as greenhouse gases, OM can be redeposited on land or transported to aquatic systems where it can be further mineralized in the water column or buried in sediments (Cory et al, 2013;Letscher et al, 2011;Vonk et al, 2014;Woods et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Transformation of terrestrial organic matter along thermokarst-affected permafrost coasts in the Arctic

Tanski

Lantuit

Ruttor

et al. 2017

Science of The Total Environment

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Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean

Cited by 86 publications

References 55 publications

Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea ecosystem

Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea ecosystem

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

Transformation of terrestrial organic matter along thermokarst-affected permafrost coasts in the Arctic

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