The impact of the freeze–melt cycle of land-fast ice on the distribution of dissolved organic matter in the Laptev and East Siberian seas (Siberian Arctic)

Permafrost degradation in the catchment of major Siberian rivers, combined with higher precipitation in a warming climate, could increase the flux of terrestrially derived dissolved organic matter (tDOM) into the Arctic Ocean (AO). Each year, â¼ 7.9 Tg of dissolved organic carbon (DOC) is discharged...

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Bibliographic Details
Published in:Biogeosciences 2021-06, Vol.18 (12), p.3637-3655
Main Authors: Hölemann, Jens A, Juhls, Bennet, Bauch, Dorothea, Janout, Markus, Koch, Boris P, Heim, Birgit
Format: Article
Language:English
Subjects:
Brines
Carbon
Carbon cycle
Catchment area
Chemical analysis
Climate change
Colour
Discharge
Dissolved organic carbon
Dissolved organic matter
Distribution
Dynamics
Fast ice
Global warming
Halocline
Ice formation
Isotope composition
Meltwater
Ocean
Oceans
Optical properties
Organic carbon
Oxygen
Oxygen isotopes
Permafrost
Precipitation (Meteorology)
Radiative forcing
River water
Rivers
Salinity
Sea ice
Sea surface
Sea surface temperature
Sea-water
Seawater
Soil degradation
Soil erosion
Spring
Spring (season)
Stratification
Surface temperature
Surface water
Surface water masses
Temperature effects
Upper ocean
Water analysis
Water circulation
Water column
Water masses
Water stratification
Winter
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Summary:Permafrost degradation in the catchment of major Siberian rivers, combined with higher precipitation in a warming climate, could increase the flux of terrestrially derived dissolved organic matter (tDOM) into the Arctic Ocean (AO). Each year, â¼ 7.9 Tg of dissolved organic carbon (DOC) is discharged into the AO via the three largest rivers that flow into the Laptev Sea (LS) and East Siberian Sea (ESS). A significant proportion of this tDOM-rich river water undergoes at least one freeze-melt cycle in the land-fast ice that forms along the coast of the Laptev and East Siberian seas in winter. To better understand how growth and melting of land-fast ice affect dissolved organic matter (DOM) dynamics in the LS and ESS, we determined DOC concentrations and the optical properties of coloured dissolved organic matter (CDOM) in sea ice, river water and seawater. The data set, covering different seasons over a 9-year period (2010-2019), was complemented by oceanographic measurements (T, S) and determination of the oxygen isotope composition of the seawater.
ISSN:1726-4189
1726-4170
1726-4189
DOI:10.5194/bg-18-3637-2021