Dissolved organic carbon (DOC) in Arctic ground ice

Michael.Fritz [ at ] awi.de


Thermal permafrost degradation and coastal erosion in the Arctic remobilize substantial amounts of organic carbon (OC) and nutrients which have accumulated in late Pleistocene and Holocene unconsolidated deposits. Permafrost vulnerability to thaw subsidence, collapsing coastlines and irreversible landscape change are largely due to the presence of large amounts of massive ground ice such as ice wedges. However, ground ice has not, until now, been considered to be a source of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC) and other elements which are important for ecosystems and carbon cycling. Here we show, using biogeochemical data from a large number of different ice bodies throughout the Arctic, that ice wedges have the greatest potential for DOC storage, with a maximum of 28.6 mg L−1 (mean: 9.6 mg L−1). Variation in DOC concentration is positively correlated with and explained by the concentrations and relative amounts of typically terrestrial cations such as Mg2+ and K+. DOC sequestration into ground ice was more effective during the late Pleistocene than during the Holocene, which can be explained by rapid sediment and OC accumulation, the prevalence of more easily degradable vegetation and immediate incorporation into permafrost. We assume that pristine snowmelt is able to leach considerable amounts of well-preserved and highly bioavailable DOC as well as other elements from surface sediments, which are rapidly frozen and stored in ground ice, especially in ice wedges, even before further degradation. We found that ice wedges in the Yedoma region represent a significant DOC (45.2 Tg) and DIC (33.6 Tg) pool in permafrost areas and a freshwater reservoir of 4200 km³. This study underlines the need to discriminate between particulate OC and DOC to assess the availability and vulnerability of the permafrost carbon pool for ecosystems and climate feedback upon mobilization.

Item Type
Primary Division
Primary Topic
Publication Status
Eprint ID
DOI 10.5194/tc-9-737-2015

Cite as
Fritz, M. , Opel, T. , Tanski, G. , Herzschuh, U. , Meyer, H. , Eulenburg, A. and Lantuit, H. (2015): Dissolved organic carbon (DOC) in Arctic ground ice , The Cryosphere, 9 (2), pp. 737-752 . doi: 10.5194/tc-9-737-2015

[thumbnail of Fritz_et_al_2015_Dissolved_organic_carbon_(DOC)_in_Arctic_ground_ice.pdf]

Download (3MB) | Preview
Cite this document as:
[thumbnail of Fritz_et_al_2015_DOC_Supplement.pdf]

Download (163kB) | Preview
Cite this document as:

Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email


Geographical region

Research Platforms

Arctic Land Expeditions > AK-Land_2006_Fairbanks_Barrow
Arctic Land Expeditions > RU-Land_2005_Lena
Arctic Land Expeditions > RU-Land_2011_MamontovKlyk
Arctic Land Expeditions > CA-Land_2009_YukonCoast
Arctic Land Expeditions > CA-Land_2012_YukonCoast

Edit Item Edit Item