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  • 1
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    Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes (2020)
    Frontiers Media
    Details
    Publication Date: 2020-05-15
    Electronic ISSN: 2296-665X
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Frontiers Media
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    PAPER CURRENT
  • 2
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    Operational MERIS-based NIR-red algorithms for estimating chlorophyll-a concentrations in coastal waters — The Azov Sea case study (2012)
    Elsevier
    Details
    Publication Date: 2012-06-01
    Print ISSN: 0034-4257
    Electronic ISSN: 1879-0704
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes (2020)
    Frontiers
    In:  Frontiers in Environmental Science, 8 . Art.Nr. 53 .
    Details
    Publication Date: 2021-01-08
    Description: Warming air temperatures, shifting hydrological regimes and accelerating permafrost thaw in the catchments of the Arctic rivers is affecting their biogeochemistry. Arctic river monitoring is necessary to observe changes in the mobilization of dissolved organic matter (DOM) from permafrost. The Lena River is the second largest Arctic river and 71% of its catchment is continuous permafrost. Biogeochemical parameters, including temperature, electrical conductivity (EC), stable water isotopes, dissolved organic carbon (DOC) and absorption by colored dissolved organic matter (aCDOM) have been measured as part of a new high-frequency sampling program in the central Lena River Delta. The results show strong seasonal variations of all biogeochemical parameters that generally follow seasonal patterns of the hydrograph. Optical indices of DOM indicate a trend of decreasing aromaticity and molecular weight from spring to winter. High-frequency sampling improved our estimated annual fluvial flux of annual dissolved organic carbon flux (6.79 Tg C). EC and stable isotope data were used to distinguish three different source water types which explain most of the seasonal variation in the biogeochemistry of the Lena River. These water types match signatures of (1) melt water, (2) rain water, and (3) subsurface water. Melt water and rain water accounted for 84% of the discharge flux and 86% of the DOC flux. The optical properties of melt water DOM were characteristic of fresh organic matter. In contrast, the optical properties of DOM in subsurface water revealed lower aromaticity and lower molecular weights, which indicate a shift toward an older organic matter source mobilized from deeper soil horizons or permafrost deposits. The first year of this new sampling program sets a new baseline for flux calculations of dissolved matter and has enabled the identification and characterization of water types that drive the seasonality of the Lena River water properties.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    PAPER (OCEANREP)
  • 4
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    Nutrient and oxygen concentrations, alkalinity and pH measured on water bottle samples collected during cruise Transdrift-XXII (VB14) in 2014, Laptev Sea (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: We collected seawater samples during TRANSDRIFT XXII Expedition in September and October 2014 along with CTD (conductivity, temperature, depth) profiles with a SBE 32 rosette water sampler equipped with 12 Niskin bottles (2.5 L) under ice-free conditions onboard the Russian research vessel RV Viktor Buynitskiy on the entire Laptev Sea shelf and above the shelf slope. The dataset includes nitrate, nitrite, ammonia, total nitrogen, phosphate, silicate and oxygen concentration data, as well as pH and total alkalinity, which provide important information on the geochemical state of the Laptev Sea.
    Keywords: Alkalinity, total; Ammonium; CTD/Rosette; CTD-RO; DATE/TIME; Depth, bathymetric; DEPTH, water; Event label; Laptev Sea; LATITUDE; LONGITUDE; Nitrate; Nitrite; Nitrogen, total; nutrients; Oxygen, dissolved; Oxygen saturation; pH; Phosphate; Salinity; Silicate; Station label; System Laptev-Sea: Transdrift; Temperature, water; TRANSDRIFT; Transdrift-XXII; VB14; VB14_10-3; VB14_11-1a; VB14_12-1a; VB14_13-1a; VB14_14-1a; VB14_15-7-1a; VB14_16-1a; VB14_17-1a; VB14_18-1a; VB14_19-2a; VB14_20-1a; VB14_21-1a; VB14_2-1a; VB14_22-3a; VB14_23-1a; VB14_24-1; VB14_25-1a; VB14_26-1a; VB14_27-1a; VB14_28-3a; VB14_29-1a; VB14_30-1a; VB14_31-1; VB14_4-2a; VB14_5-1a; VB14_6-3a; VB14_7-1a; VB14_8-1a; VB14_9-2; Viktor Buynitskiy
    Type: Dataset
    Format: text/tab-separated-values, 3094 data points
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    DATA PANGAEA
  • 5
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    Nutrient and oxygen concentrations measured on water bottle samples collected during cruise TRANSDRIFT-XXI (VB13) in 2013, Laptev Sea (2021)
    PANGAEA
    Details
    Publication Date: 2023-02-12
    Description: We collected seawater samples during TRANSDRIFT XXI Expedition in August and September 2013 along with CTD (conductivity, temperature, depth) profiles with a SBE 32 rosette water sampler equipped with 12 Niskin bottles (2.5 L) under ice-free conditions onboard the Russian research vessel RV Viktor Buynitskiy on the entire Laptev Sea shelf and above the shelf slope (down to ∼310 m depth). The dataset includes nitrate, nitrite, phosphate, silicate and oxygen concentration data , which provide important information on nutrient sources and cycling in the Laptev Sea.
    Keywords: CTD/Rosette; CTD-RO; DATE/TIME; Depth, bathymetric; DEPTH, water; Event label; Laptev Sea; LATITUDE; LONGITUDE; Nitrate; Nitrite; Oxygen, dissolved; Oxygen saturation; Phosphate; Salinity; Silicate; Station label; System Laptev-Sea: Transdrift; Temperature, water; TRANSDRIFT; Transdrift-XXI; VB13; VB13_10-1; VB13_11-1; VB13_1-1a; VB13_12-1; VB13_13-1; VB13_14-1; VB13_15-2; VB13_16-1; VB13_16-11; VB13_16-13; VB13_16-3; VB13_16-6; VB13_17-1; VB13_18-1; VB13_19-1; VB13_20-1; VB13_2-1a; VB13_3-1; VB13_5-4; VB13_7-1; VB13_8-1; VB13_9-1; Viktor Buynitskiy
    Type: Dataset
    Format: text/tab-separated-values, 1701 data points
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    DATA PANGAEA
  • 6
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    Organic matter, water-isotopes and cell abundances of Arctic Century cruise (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-15
    Description: The discrete biogeochemical measurements from RV Akademik Tryoshnikov AT21 sampled for chlorophylla, delta 18O isotopes, dissolved organic matter and microbial cell abundances. The parameters include dO, d18O, Chla, DOC, cDOM, TDN, DIN, combined carbohydrates, hydrolysable amino acids, and microbial cell abundances. The samples were aquired within 0-10 m of the Barents and Laptev Sea, lake, and snow between 76 N to 82 N and 59 E to 106 E. The data was collected on board Arctic Century cruise from 09th August 2021-2nd September 2021. The water collection occured using a CTD, bucket (lake) and gloves (snow, thawed). The laboratory methods varied by parameter: chlorophyll using Turner Designs Trilogy fluorometer, oxygen isotopes using a Finnigan Delta-S mass spectrometer, DOC/TDN was analysed using TOC-VCSH, and cDOM were analyzed spectrophotometrically, dissolved carbohydrates using high performance anion exchange chromatography coupled with pulsed amperometric detection, dissolved amino acids using ortho-phthaldialdehyde derivatization by high-performance liquid chromatography, and microbial cell abundance (phytoplankton, bacteria) was analysed using flow cytometery. The purpose of data collection was to understand spatial variability of organic mater and associated dynamics of the microbial loop.
    Keywords: Absorption coefficient, colored dissolved organic matter at 254 nm; Absorption coefficient, colored dissolved organic matter at 325 nm; Akademik Tryoshnikov; Alanine; Amino acids, dissolved hydrolyzable; Arabinose; Arctic; ArcticCentury; Arctic Ocean; Arginine; Aspartic acid; AT21; AT21_001-5; AT21_004-1; AT21_008-1; AT21_013-1; AT21_014-1; AT21_015-1; AT21_017-1; AT21_023-1; AT21_024-1; AT21_029-1; AT21_032-1; AT21_036-1; AT21_040-6; AT21_041-1; AT21_047-1; AT21_049-1; AT21_057-1; AT21_060-1; AT21_061-1; AT21_067-1; AT21_068-1; AT21_073-1; AT21_075-1; AT21_075-2; AT21_080-1; AT21_089-1; AT21_098-1; AT21_106-1; AT21_109-1; AT21_113-1; AT21_114-1; AT21_115; AT21_117-1; AT21_125-1; AT21014-Wo-SP-1-42; AT21076-AN-S-4; AT21078_lake; ATWi-SP-1-22; Bacteria; Barents Sea; BUCKET; Bucket water sampling; Calculated; Carbohydrates, dissolved combined; Carbon, organic, dissolved; Chlorophyll a; chlorophyll-a; Cryptophytes; CTD, underway; CTD/Rosette; CTD-RO; CTD-UW; DATE/TIME; delta18O; DEPTH, water; Deuterium excess; Double-beam spectrophotometer 1800 UV-VIS, Shimadzu; Event label; FACSCalibur flow-cytometer (Becton Dickinson); Fucose; Galactosamine; Galactose; Galacturonic acid; Glucosamine; Glucuronic acid; Glutamic acid; Glycine; HELI; Helicopter; High performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD), Dionex 3000; High Performance Liquid Chromatography (HPLC) ortho-phthaldialdehyde derivatization, Agilent 1260; High temperature catalytic oxidation; Isoleucine; Kara Sea; Laboratory fluorometer, Turner, Trilogy; Laptev Sea; LATITUDE; Leucine; LONGITUDE; Mannose/Xylose; Mass spectrometer Finnigan Delta-S; Nanoplankton; Nitrate; Nitrite; Nitrogen, total dissolved; organic carbon; Phenylalanine; Phosphate; Phosphorus, total dissolved; Phytoplankton; Picoplankton; Rhamnose; Sample code/label; SEAL Analytical, continuous flow analyser QuAAtro; Serine; Snow depth; Spectral slope of colored dissolved organic matter absorption, 275-295 nm; Spectral slope of colored dissolved organic matter absorption, 300-500 nm; Spectral slope of colored dissolved organic matter absorption, 350-400 nm; Spectral slope of colored dissolved organic matter absorption ratio; Station label; Synechococcus; Threonine; Tyrosine; Valine; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 2211 data points
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    DATA PANGAEA
  • 7
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    Lena River surface water monitoring near the Samoylov Island Research Station (2020)
    PANGAEA
    Details
    Publication Date: 2024-04-26
    Description: Current warming, shifting hydrological regimes and accelerated permafrost thaw in the catchment of the Arctic rivers will affect their water biogeochemistry. The Lena River is the second largest Arctic river and 71 % of its catchment is characterized by continuous permafrost. Monitoring of Arctic rivers will enable to observe expected changes in matter transport such as an increase of dissolved organic matter (DOM) re-mobilization from permafrost. A number of biogeochemical variables are presented here in a unique high frequency throughout the whole year. The sampling of Lena River water is done near the Research Station Samoylov Island in the central Lena River Delta. The Samoylov research station allows a unique chance for continuous sampling since it operates throughout the year.
    Keywords: biogeochemistry; CDOM; DOC; DOM; major ions; Olenekskaya_Ch; RIVER; Sampling river; stable water isotopes
    Type: Dataset
    Format: application/zip, 10 datasets
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    DATA PANGAEA
  • 8
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    Temperature, electrical conductivity, DOC, CDOM, stable water isotopes and major ions of Lena River water from April 2018 to April 2019 (2020)
    PANGAEA
    Details
    Publication Date: 2024-04-24
    Description: A number of studies expect an increase of carbon export by rivers to the Arctic Ocean due to rapidly changing climate in the Arctic One possible reason for the increase of carbon export is thawing permafrost, which can lead to a mobilization of previously frozen dissolved organic matter (DOM). Scarce measurements of DOC and the coloured fraction of DOM (CDOM) (〈 8 samples/year) were previously used to estimate fluxes to the Arctic Ocean for the whole year. Here, we present a new high frequency sampling program and its viability to monitor export fluxes of DOM and its biogeochemistry in the Lena River. This dataset includes measurements of several water parameters, such as temperature, electric conductivity, dissolved organic carbon (DOC), spectral CDOM absorption (aCDOM), stable water isotopes and major ions. The high sampling frequency throughout the whole year facilitats the identification of the main drivers behind the seasonality of DOM concentration and biogeochemistry of the Lena River. The high number of samples throughout the whole year allows flux calculations that are independently from load models that likely lead to a large variation of earlier studies. Optical indices reveal changing composition and sources of DOM throughout the year. This dataset represents the first year (April 2018 to April 2019) of a planned long-term monitoring program at the Research Station Samoylov Island and provides a baseline data set against which future change of this large integrative system may be measured. A continuous sampling of Arctic River water will facilitate to identify intra and inter-annual trends with ongoing climate change.
    Keywords: Absorption coefficient, colored dissolved organic matter at given wavelength; Aluminium; AWI Arctic Land Expedition; Barium 2+; biogeochemistry; Bromide; Calcium; Calculated; Carbon, organic, dissolved; CDOM; Chloride; Conductivity, electrical; DATE/TIME; DEPTH, water; Deuterium excess; DOC; DOM; Fluoride; Handheld meter, WTW, 340i, Conductivity; Identification; Inductively coupled plasma optical emission spectrometry (ICP-OES), Perkin-Elmer, Optima 8300DV; Ion chromatography (Thermo-Fischer ICS 2100); Iron; Latitude of event; Lena 2018; Lena 2019; Longitude of event; Magnesium; major ions; Manganese; Mass spectrometer Finnigan Delta-S/equilibration device; Nitrate; Olenekskaya_Ch; Phosphate; Phosphorus; Potassium; RIVER; RU-Land_2018_Lena; RU-Land_2018_Lena_Olenekskaya; RU-Land_2019_Lena; RU-Land_2019_Lena_Olenekskaya; Sampling river; Shimadzu TOC-VCPH total organic carbon analyzer; Silicon; Sodium; Specific ultraviolet absorbance normalized to DOC; Spectrophotometer UV/VIS (PerkinElmer Lambda 950); stable water isotopes; Strontium 2+; Sulfate; Temperature, water; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 42031 data points
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    DATA PANGAEA
  • 9
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    Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes (2020)
    In:  EPIC3Frontiers in Environmental Science, 8, pp. 53
    Details
    Publication Date: 2022-07-04
    Description: Warming air temperatures, shifting hydrological regimes and accelerating permafrost thaw in the catchments of the Arctic rivers is affecting their biogeochemistry. Arctic river monitoring is necessary to observe changes in the mobilization of dissolved organic matter (DOM) from permafrost. The Lena River is the second largest Arctic river and 71% of its catchment is continuous permafrost. Biogeochemical parameters, including temperature, electrical conductivity (EC), stable water isotopes, dissolved organic carbon (DOC) and absorption by colored dissolved organic matter (aCDOM) have been measured as part of a new high-frequency sampling program in the central Lena River Delta. The results show strong seasonal variations of all biogeochemical parameters that generally follow seasonal patterns of the hydrograph. Optical indices of DOM indicate a trend of decreasing aromaticity and molecular weight from spring to winter. High-frequency sampling improved our estimated annual fluvial flux of annual dissolved organic carbon flux (6.79 Tg C). EC and stable isotope data were used to distinguish three different source water types which explain most of the seasonal variation in the biogeochemistry of the Lena River. These water types match signatures of (1) melt water, (2) rain water, and (3) subsurface water. Melt water and rain water accounted for 84% of the discharge flux and 86% of the DOC flux. The optical properties of melt water DOM were characteristic of fresh organic matter. In contrast, the optical properties of DOM in subsurface water revealed lower aromaticity and lower molecular weights, which indicate a shift toward an older organic matter source mobilized from deeper soil horizons or permafrost deposits. The first year of this new sampling program sets a new baseline for flux calculations of dissolved matter and has enabled the identification and characterization of water types that drive the seasonality of the Lena River water properties.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed , info:eu-repo/semantics/article
    Format: application/pdf
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    PAPER (OA)
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