Biogeochemical characteristics of dissolved and particulate organic matter in Russian rivers entering the Arctic Ocean

Lobbes, J. M.; Fitznar, H. P.; Kattner, Gerhard

doi:10.1016/s0016-7037(00)00409-9

Cited by 337 publications

(286 citation statements)

References 41 publications

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“…The main sources of total suspended matter (TSM) are eroded land and the thawing permafrost (Rachold et al, 1996;Lobbes et al, 2000). Similar studies in the Kara Sea about optical properties, remote sensing, and carbon content were carried out by Pozdnyakov et al (2005), Hessen et al (2010), and Korosov et al (2011).…”

Section: Introductionmentioning

confidence: 86%

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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Section: Introductionmentioning

confidence: 86%

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

et al. 2013

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“…1). The rivers studied account for approximately one third of the riverine dissolved organic carbon (DOC) discharge to the Arctic Ocean (Lobbes et al 2000). Additionally, samples were obtained from the Laptev Sea at vertical profiles (water surface to bottom) along a 550-km transect and from several surface water stations Dittmar et al 2001a).…”

Section: Methodsmentioning

confidence: 99%

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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“…This situation is different from Siberian rivers, where significant quantities of POC are discharged into their estuaries and is comprised primarily of refractory compounds derived from vascular plant detritus. Also, the phytoplankton and living bacterial biomass is low in all high Arctic rivers (Cauwet and Sidorov, 1996;Sorokin and Sorokin, 1996;Lobbes et al, 2000;Dittmar and Kattner, 2003). The POC/PON ratio is 11 on average for the Russian Arctic rivers (Lobbes et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

“…Also, the phytoplankton and living bacterial biomass is low in all high Arctic rivers (Cauwet and Sidorov, 1996;Sorokin and Sorokin, 1996;Lobbes et al, 2000;Dittmar and Kattner, 2003). The POC/PON ratio is 11 on average for the Russian Arctic rivers (Lobbes et al, 2000). At the beginning of July 2001, phytoplankton was studied in the section from the river (St. 25) to the strait of Kemskaya Salma (St. 16 and 15) and to the shallow sea water (St. 11 and 12).…”

Section: Resultsmentioning

confidence: 99%

Biogeochemistry of the Kem' River estuary, White Sea (Russia)

Шевченко

Dolotov

Filatov

et al. 2005

Hydrol. Earth Syst. Sci.

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Abstract. The biogeochemistry of the river-sea interface was studied in the Kem' River (the largest river flowing to the White Sea from Karelian coast) estuary and adjacent area of the White Sea onboard the RV "Ekolog" in summer 2001, 2002 and 2003. The study area can be divided into 3 zones: I -the estuary itself, with water depth from 1 to 5 m and low salinity in the surface layer (salinity is lower than 0.2 psu in the Kem' River and varies from 15 to 20 psu in outer part of this zone); II -the intermediate zone with depths from 5 to 10 m and salinity at the surface from 16 to 22 psu; IIIthe marine zone with depths from 10 to 29 m and salinity 21-24.5 psu. Highest concentrations of the suspended particulate matter (SPM) were registered in the Kem' mouth (5-7 mg/l). They sharply decreased to values <1 mg/l towards the sea. At beginning of July 2001, particulate organic carbon (POC) concentration in the river mouth was 404 µg/l and POC content in total SPM was 5.64%. In the marine part of the studied area the POC concentration varied from 132 to 274 µg/l and the POC contents in suspended matter increased to 19-52.6%. These studies show, that the majority of riverborne suspended matter in the Kem' estuary deposits near the river mouth within the 20 psu isohaline, where sedimentation of the suspended matter takes place. The role of freshwater phytoplankton species decreases and the role of marine species increases from the river to sea and the percentage of green algae decreases and the role of diatoms increases. The organic carbon (C org ) to nitrogen (N) ratio (C org /N) in both suspended matter and bottom sediments decreases from the river to the marine part of the mixing zone (from 8.5 to 6.1 in the suspended matter and from 14.6 to 7.5 in the bottom sediments), demonstrating that content of terrestrial-derived organic matter decreases and content of marine organic matter Correspondence to: V. P. Shevchenko (vshevch@geo.sio.rssi.ru) increases from the river mouth to the sea. The Kem' estuary exhibits a similar character of biogeochemial processes as in the large Arctic estuaries, but the scale of these processes (amount of river input of SPM, POC, area of estuaries) is different.

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Biogeochemical characteristics of dissolved and particulate organic matter in Russian rivers entering the Arctic Ocean

Cited by 337 publications

References 41 publications

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

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

Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Biogeochemistry of the Kem' River estuary, White Sea (Russia)

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