Banding records of breeding shorebirdsin the Lena Delta, Russia

The dynamics of Lena delta coastline since the late XX century up to the present time have been studied using Landsat satellite data. The comparison of different-time images of morphologically different segments of the delta coastline has shown the major portion of the delta to be stable. Minimal changes have been recorded near the mouths of the branches carrying a minor portion of the Lena runoffthe Olenekskaya and Tumatskie. In the eastern part of the delta, near the mouths of copious branches Trofimovskaya and Bykovskaya, no changes have taken place, as well as in its western part, which is represented by a part of abrasion marine terrace embraced by the delta. In the southwestern part, in the Olenek delta, the delta coastline has been eroded with the erosion material transported eastward by along-shore current. Near the mouths of the Tumatskaya branch, the forms of marine accumulation are unstable, and the marine terrace in the northeastern part of the delta shows a minor local erosion. The periods of erosion in different delta areas are not synchronous and the eroded zones are not large in size. No increment in the land, nor shore progradation have been seen.

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Origin-specific molecular signatures of dissolved organic matter in the Lena Delta

Biogeochemistry ◽

10.1007/s10533-014-0049-0 ◽

2014 ◽

Vol 123 (1-2) ◽

pp. 1-14 ◽

Cited By ~ 18

Author(s):

I. Dubinenkov ◽

R. Flerus ◽

P. Schmitt-Kopplin ◽

G. Kattner ◽

B. P. Koch

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Molecular Signatures ◽

Lena Delta

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Magnetic imaging of the Kurungnakh Island ice complex upper layer structure, Lena Delta, Russia

Near Surface Geophysics ◽

10.3997/1873-0604.2017016 ◽

2017 ◽

Vol 15 (5) ◽

pp. 527-532

Author(s):

Leonid Tsibizov ◽

Olga Rusalimova

Keyword(s):

Layer Structure ◽

Magnetic Imaging ◽

Lena Delta ◽

Ice Complex

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Detection of landscape dynamics in the Arctic Lena Delta with temporally dense Landsat time-series stacks

Remote Sensing of Environment ◽

10.1016/j.rse.2016.03.038 ◽

2016 ◽

Vol 181 ◽

pp. 27-41 ◽

Cited By ~ 32

Author(s):

Ingmar Nitze ◽

Guido Grosse

Keyword(s):

Time Series ◽

Landscape Dynamics ◽

The Arctic ◽

Lena Delta

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Fate and transport of nitrogen in soils, sediment and water of the Lena Delta, Northeast Siberia

10.5194/egusphere-egu2020-21011 ◽

2020 ◽

Author(s):

Tina Sanders ◽

Matthias Fuchs ◽

Kirstin Dähnke

Keyword(s):

Organic Matter ◽

Arctic Ocean ◽

Inorganic Nitrogen ◽

Organic Matter Content ◽

The Arctic ◽

Nitrous Oxide Emissions ◽

Reactive Nitrogen ◽

Particulate Nitrogen ◽

Incubation Experiments ◽

Lena Delta

<p>Soils and sediments in the Lena Delta in Northeast Siberia store large amounts of organic matter including organic bound nitrogen. This nitrogen is not directly available for plants and primary production, but can be remineralised in the soils or in sediments after erosion to the Lena River. Our study aims to estimate the load of reactive nitrogen from terrestrial sources into the Arctic Ocean. Therefore, water and sediment samples were collected along a transect (~200 km) from the centre of the Delta to the open Laptev Sea in summer 2019. On the collected samples, we will measure dissolved organic and inorganic nitrogen, particulate nitrogen and CN ratio. In addition, the <sup>15</sup>N stable isotope values of these components will be determined to identify nitrogen sources, sinks and processes of nitrogen transformation. Additionally, we carried out incubation experiments in the field to determine the potential remineralisation rates of various soil types in Lena water and nutrients fluxes of the sediments. The load of dissolved inorganic nitrogen in the Lena water in the delta was very low and low nitrate and silicate concentration indicate uptake by phytoplankton. Outside the Lena Delta, a lens of nutrient depleted freshwater covered the salty Arctic Ocean water, which had higher loads of reactive nitrogen. The organic matter content of the soils and sediment is highly variable and ranges from 1 to 45 %. This organic matter is the source of reactive nitrogen, which is determined in incubation experiments and using nitrogen stable isotopes. We found that especially the unvegetated soils and sediment are sources of reactive nitrogen in the end of vegetation period, and are potentially sources of nitrous oxide emissions.</p>

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Palaeoenvironmental dynamics inferred from late Quaternary permafrost deposits on Kurungnakh Island, Lena Delta, Northeast Siberia, Russia

Quaternary Science Reviews ◽

10.1016/j.quascirev.2008.04.007 ◽

2008 ◽

Vol 27 (15-16) ◽

pp. 1523-1540 ◽

Cited By ~ 82

Author(s):

Sebastian Wetterich ◽

Svetlana Kuzmina ◽

Andrei A. Andreev ◽

Frank Kienast ◽

Hanno Meyer ◽

...

Keyword(s):

Late Quaternary ◽

Lena Delta

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18O abundance and dissolved silicate in the Lena delta and Laptev Sea (Russia)

Marine Chemistry ◽

10.1016/0304-4203(93)90215-a ◽

1993 ◽

Vol 43 (1-4) ◽

pp. 47-64 ◽

Cited By ~ 70

Author(s):

R. Létolle ◽

J.M. Martin ◽

A.J. Thomas ◽

V.V. Gordeev ◽

S. Gusarova ◽

...

Keyword(s):

Laptev Sea ◽

Dissolved Silicate ◽

Lena Delta

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Methane distribution and oxidation around the Lena Delta in summer 2013

10.5194/bg-2017-22 ◽

2017 ◽

Cited By ~ 1

Author(s):

Ingeborg Bussmann ◽

Steffen Hackbusch ◽

Patrick Schaal ◽

Antje Wichels

Keyword(s):

Methane Oxidation ◽

Methane Flux ◽

Methanotrophic Bacteria ◽

Riverine Water ◽

Lena River ◽

Methane Distribution ◽

Methane Oxidation Rate ◽

Mixed Water ◽

Polar Water ◽

Lena Delta

Abstract. The Lena River is one of the biggest Russian rivers draining into the Laptev Sea. Due to predicted increasing temperatures, the permafrost areas surrounding the Lena Delta will melt at increasing rates. With this melting, high amounts of methane will reach the waters of the Lena and the adjacent Laptev Sea. Methane oxidation by methanotrophic bacteria is the only biological way to reduce methane concentrations within the system. However, the polar estuary of the Lena River is a challenging environment for bacteria, with strong fluctuations in salinity and temperature. We determined the activity (tracer method) and the abundance (qPCR) of aerobic methanotrophic bacteria. We described the methanotrophic population with MISA; as well as the methane distribution (head space) and other abiotic parameters in the Lena Delta in September 2013. In riverine water (S < 5) we found a median methane concentration of 22 nM, in mixed water (5 < S < 20) the median methane concentration was 19 nM and in polar water (S > 20) a median 28 nM was observed. The Lena River was not the methane source for surface water, and bottom water methane concentrations were mainly influenced by the concentration in surface sediments. However, the methane oxidation rate in riverine and polar water was very similar (0.419 and 0.400 nM/d), but with a higher relative abundance of methanotrophs and a higher estimated diversity with respect to MISA OTUs in the rivine water as compared to polar water. The turnover times of methane ranged from 167 d in mixed water, 91 d in riverine water and only 36 d in polarwater. Also the environmental parameters influencing the methane oxidation rate and the methanotrophic population differed between the water masses. Thus we postulate a riverine methanotrophic population limited by sub-optimal temperatures and substrate concentrations and a polar methanotrophic population being well adapted to the cold and methane poor environment, but limited by the nitrogen content. The diffusive methane flux into the atmosphere ranged from 4–163 µmol m2 d−1 (median 24). For the total methane inventory of the investigated area, the diffusive methane flux was responsible for 8 % loss, compared to only 1 % of the methane consumed by the methanotrophic bacteria within the system.

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