Tracing dissolved organic substances and nutrients from the Lena River through Laptev Sea (Arctic)

Kattner, Gerhard; Lobbes, J. M.; Fitznar, H. P.; Engbrodt, Ralph; Nöthig, Eva‐Maria; Lara, R. J.

doi:10.1016/s0304-4203(99)00008-0

Cited by 121 publications

(88 citation statements)

References 40 publications

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“…Terrigenous DON accounted for 28 Ϯ 13% of the total DON on the Laptev Sea shelf. Kattner et al (1999) calculated a terrigenous DON contribution of 20-30% for the Laptev Sea shelf, on the basis of lignin data and the assumption that terrigenous DOC and DON behave in a similar fashion in this area. The consistency of the two independent approaches confirms the usefulness of PCA factor 1 as a quantitative measure for terrigenous DON.…”

Section: Resultsmentioning

confidence: 99%

“…Spectroscopic properties have also been used to identify the source of dissolved organic matter in coastal zones (e.g., Moran et al 1991). For organic nitrogen, however, the usefulness of lignin or general spectroscopic information as tracers is limited, because DON may cycle uncoupled from organic carbon or bulk organic matter (e.g., Kattner and Becker 1991). A molecule that would unambiguously trace terrigenous organic nitrogen in the ocean is not yet known.…”

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confidence: 99%

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Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Dittmar

2004

Limnology & Oceanography

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To trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal-components analyses (PCA) was used on a data set of 13 amino acids released via hydrolyses from a total of 110 water samples from Russian rivers, adjacent near-shore locations, and the Laptev Sea. The first component of the PCA distinguished significantly between terrigenous DON from the rivers (1.2 Ϯ 0.1) and marine-derived DON in the deep central Arctic Ocean (Ϫ1.1 Ϯ 0.2). The significance of this distinction was validated with amino acid data from seawater and river samples from other regions. The second PCA component correlated significantly with the proportion of D-alanine, a tracer for microbial degradation. The percentage of terrigenous DON in the Arctic Ocean was assessed from the first PCA component. The model was calibrated using data from the rivers (100% terrigenous) and the deep central Arctic Ocean (ϳ0% terrigenous) as end members. Terrigenous DON accounted for 28 Ϯ 13% of the total DON on the Laptev Sea shelf, which is in good agreement with independent, lignin-based estimates. High proportions of terrigenous DON (up to 100%) were calculated for the continental slope down to 2,000 m depth and are probably due to downward convection of brine-enriched shelf waters. The model presented here provides the first direct evidence of terrigenous DON in the deep sea. The model may be directly applied to trace the fate of terrigenous DON in other terrestrially dominated marine environments.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Dittmar

2004

Limnology & Oceanography

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“…The Lena River with its extensive delta is the pathway for transport of large amounts of organic and inorganic material, in diverse forms of carbon, from its huge catchment area of about 2 486 000 km 2 into the Arctic Ocean, particularly into the Laptev Sea (Kattner et al, 1999). It has an annual fresh water discharge of around 500 km 3 (Dmitrenko et al, 2008; http://www.feow.org/ecoregion_details.php?eco= 608).…”

Section: Introductionmentioning

confidence: 99%

Contribution to a bio-optical model for remote sensing of Lena River water

et al. 2013

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Abstract. Bio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, during the period of maximum runoff. This aimed to contribute to the development of a biooptical model for use as the basis for optical remote sensing of coastal water of the Arctic. In this context the absorption by CDOM (colored dissolved organic matter) and particles, and the concentrations of total suspended matter, phytoplankton-pigments, and carbon were measured. CDOM was found to be the most dominant parameter affecting the optical properties of the river, with an absorption coefficient of 4.5-5 m −1 at 442 nm, which was almost four times higher than total particle absorption values at visible wavelength range. The wavelenght-dependence of absorption of the different water constituents was chracterized by determining the semi logarithmic spectral slope. Mean CDOM, and detritus slopes were 0.0149 nm −1 (standard deviation (stdev) = 0.0003, n = 18), and 0.0057 nm −1 (stdev = 0.0017, n = 19), respectively, values which are typical for water bodies with high concentrations of dissolved and particulate carbon. Mean chlorophyll a and total suspended matter were 1.8 mg m −3 (stdev = 0.734 n = 18) and 31.9 g m −3 (stdev = 19.94, n = 27), respectively. DOC (dissolved organic carbon) was in the range 8-10 g m −3 and the total particulate carbon (PC) in the range 0.25-1.5 g m −3 . The light penetration depth (Secchi disc depth) was in the range 30-90 cm and was highly correlated with the suspended matter concentration. The period of maximum river runoff in June was chosen to obtain bio-optical data when maximum water constituents are transported into the Laptev Sea. However, we are aware that more data from other seasons and other years need to be collected to establish a general bio-optical model of the Lena water and conclusively characterize the light climate with respect to primary production.

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“…The general role of estuaries in retaining terrestrialderived matter is well known, whereas for DOM the role of respiration and sedimentation as potential removal pro-cesses are not yet clearly understood (Hedges and Keil 1999;Kattner et al 1999;Raymond and Bauer 2001a). 90% of total marine organic matter burial is believed to occur in the estuaries and shelf areas (Berner 1989), but a precise estimate of how much of this buried matter originates from terrestrial matter and how much is derived from full marine-and estuarine-derived matter is still missing (Humborg 1997;Raymond and Bauer 2001a).…”

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confidence: 99%

“…Furthermore, respiration as a possible removal process is the least constrained rate in carbon mass balances for seawaters in general (del Giorgio and Duarte 2002). Thus, there are no general agreements on the C removal processes in the estuarine areas of high latitudes (Hedges et al 1997;del Giorgio and Duarte 2002;Algesten et al 2006) Property salinity plots of total organic carbon (TOC) and of DOC often show conservative behavior in highlatitude estuaries (Wedborg et al 1994;Kattner et al 1999), whereas studies from the Baltic Sea have shown that humic substances as typically land-derived material showed a negative deviation from the conservative mixing line, indicating significant removal during estuarine mixing (Fonselius 1995). Removal processes could be masked by estuarine primary production in salinity-DOC plots (Raymond and Bauer 2001a), and the key issue to understanding the retention and the fate of terrestrialderived matter in estuaries is to be able to determine the contribution of allochthonous (terrestrial) vs. autochthonous (marine and estuarine) organic carbon to total DOC (Hedges et al 1997).…”

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Tracing terrestrial organic matter by δ34S and δ13C signatures in a subarctic estuary

Alling

Humborg

Mörth

et al. 2008

Limnology & Oceanography

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A key issue to understanding the transformations of terrestrial organic carbon in the ocean is to disentangle the latter from marine-produced organic matter. We applied a multiple stable isotope approach using d 34 S and d 13 C isotope signatures from estuarine dissolved organic matter (DOM), enabling us to constrain the contribution of terrestrial-derived DOM in an estuarine gradient of the northern Baltic Sea. The stable isotope signatures for dissolved organic sulfur (d 34 S DOS ) have twice the range between terrestrial and marine end members compared to the stable isotope signatures for dissolved organic carbon (d 13 C DOC ); hence, the share of terrestrial DOM in the total estuarine DOM can be calculated more precisely. DOM samples from the water column were collected using ultrafiltration on board the German RV Maria S Merian during a winter cruise, in the Bothnian Bay, Bothnian Sea, and Baltic proper. We calculated the terrestrial fraction of the estuarine DOC (DOC ter ) from both d 13 C DOC and d 34 S DOS signatures and applying fixed C : S ratios for riverine and marine end members to convert S isotope signatures into DOC concentrations. The d 34 S DOS signature of the riverine end member was +7.02%, and the mean signatures from Bothnian Bay, Bothnian Sea, and Baltic proper were +10.27, +12.51, and +13.67%, respectively, showing an increasing marine signal southwards (d 34 S DOS marine end member 5 18.1%). These signatures indicate that 87%, 75%, and 67%, respectively, of the water column DOC is of terrestrial origin (DOC ter ) in these basins. Comparing the fractions of DOC ter in each basin-that are still based on few winter values only-with the annual river input of DOC, it appears that the turnover time for DOC ter in the Gulf of Bothnia is much shorter than the hydraulic turnover time, suggesting that high-latitude estuaries might be efficient sinks for DOC ter .

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Tracing dissolved organic substances and nutrients from the Lena River through Laptev Sea (Arctic)

Cited by 121 publications

References 40 publications

Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Contribution to a bio-optical model for remote sensing of Lena River water

Tracing terrestrial organic matter by δ34S and δ13C signatures in a subarctic estuary

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