Dissolved organic matter in the Lena Delta in 2009

Large Arctic rivers discharge significant amounts of dissolved organic matter (DOM) into the Arctic Ocean. We sampled natural waters of the Lena River, the Buor-Khaya Bay (Laptev Sea), permafrost melt water creeks, ice complex melt water creeks and a lake. The goal of this study was to characterize...

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Bibliographic Details
Main Authors: Dubinenkov, Ivan, Flerus, Ruth, Schmitt-Kopplin, Philippe, Kattner, Gerhard, Koch, Boris P
Format: Dataset
Language:English
Published: PANGAEA 2014
Subjects:
AWI_Coast
AWI Arctic Land Expedition
Carbon
organic
dissolved
Coastal Ecology @ AWI
DATE/TIME
Depth
bathymetric
water
High temperature catalytic oxidation
LATITUDE
Lena2009
Lena Delta
Siberia
Russia
LenaDelta2009
Location type
LONGITUDE
MULT
Multiple investigations
Nitrogen
total dissolved
RU-Land_2009_Lena
Sample ID
Arctic
Arctic Ocean
Laptev Sea
Khaya
Buor-Khaya
Ice
laptev
lena delta
lena river
permafrost
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.831765
https://doi.org/10.1594/PANGAEA.831765
Description
Summary:Large Arctic rivers discharge significant amounts of dissolved organic matter (DOM) into the Arctic Ocean. We sampled natural waters of the Lena River, the Buor-Khaya Bay (Laptev Sea), permafrost melt water creeks, ice complex melt water creeks and a lake. The goal of this study was to characterize the molecular DOM composition with respect to different water bodies within the Lena Delta. We aimed at an identification of source-specific DOM molecular markers and their relative contribution to DOM of different origin. The molecular characterization was performed for solid-phase extracted DOM by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Average dissolved organic carbon concentrations in the original samples were 490±75 µmol C/L for riverine and bay samples and 399±115 µmol C/L for permafrost melt water creeks. Average TDN concentrations were elevated in the permafrost melt waters (19.7±7.1 µmol N/L) in comparison to the river and the bay (both 13.2±2.6 µmol N/L). FT-ICR MS and statistical tools demonstrated that the origin of DOM in the Lena Delta was systematically reflected in its molecular composition. Magnitude weighted parameters calculated from MS data (O/Cwa, H/Cwa, C/Nwa) highlighted preliminary sample discrimination. The highest H/Cwa of 1.315 was found for DOM in melt water creeks in comparison to 1.281 for river and 1.230 for the bay samples. In the bay samples we observed a higher fraction of oxygen-rich components which was reflected in an O/Cwa ratio of 0.445 in comparison to 0.425 and 0.427 in the river and creeks, respectively. From the southernmost location to the bay a relative depletion of nitrogenous molecular markers and an enrichment of oxidized DOM components occurred. The highest contribution of nitrogenous components was indicative for creeks reflected in a C/Nwa of 104 in comparison to 143 and 176 in the river and bay, respectively. These observations were studied on a molecular formula level using principal component and indicator value analyses. The ...

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