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Fritz, Michael; Opel, Thomas; Tanski, George; Herzschuh, Ulrike; Meyer, Hanno; Eulenburg, Antje; Lantuit, Hugues (2015): Dissolved organic carbon (DOC) in Arctic ground ice, from northwest Canada, east Siberia, and Alaska. PANGAEA, https://doi.org/10.1594/PANGAEA.846074, Supplement to: Fritz, M et al. (2015): Dissolved organic carbon (DOC) in Arctic ground ice. The Cryosphere, 9(2), 737-752, https://doi.org/10.5194/tc-9-737-2015

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Abstract:
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 (mean: 9.6 mg/L). 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 km**3. 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.
Coverage:
Median Latitude: 70.403801 * Median Longitude: -172.285792 * South-bound Latitude: 65.030000 * West-bound Longitude: 117.170000 * North-bound Latitude: 73.600000 * East-bound Longitude: -138.318340
Date/Time Start: 2007-08-22T00:00:00 * Date/Time End: 2007-08-22T00:00:00
Event(s):
BAR-06-1.23A * Latitude: 71.300000 * Longitude: -156.670000 * Location: Barrow, Northern Alaska * Method/Device: Sampling by hand (HAND)
BAR-06-IW1-29A * Latitude: 71.300000 * Longitude: -156.670000 * Location: Barrow, Northern Alaska * Method/Device: Sampling by hand (HAND)
BAR-06-IW1-34A * Latitude: 71.300000 * Longitude: -156.670000 * Location: Barrow, Northern Alaska * Method/Device: Sampling by hand (HAND)
Comment:
This study was undertaken in the Helmholtz Young Investigators Group 'COPER' - Coastal permafrost erosion, organic carbon and nutrient release in the Arctic nearshore zone (Helmholtz Association grant no. VH-NG-801 to Hugues Lantuit).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventFritz, Michael
2Location of eventLocationFritz, Michael
3Latitude of eventLatitudeFritz, Michael
4Longitude of eventLongitudeFritz, Michael
5Ice typeIce typeFritz, Michael
6StratigraphyStratigraphyFritz, Michael
7Carbon, organic, dissolvedDOCmg/lFritz, MichaelHTCO, Shimadzu TOC-V
8Carbon, inorganic, dissolvedDICmg/lFritz, MichaelCalculatedfrom [HCO3]-
9δ18Oδ18OFritz, MichaelMass spectrometer Finnigan Delta-S/equilibration device
10δ DeuteriumδD‰ SMOWFritz, MichaelMass spectrometer Finnigan Delta-S/equilibration device
11Deuterium excessd xsFritz, MichaelMass spectrometer Finnigan Delta-S/equilibration device
12pHpHFritz, Michael
13Conductivity, electrolyticECµS/cmFritz, Michael
14ChlorideCl-mg/lFritz, MichaelIon chromatography DX-320 (Dionex Corp.)
15Sulfate[SO4]2-mg/lFritz, MichaelIon chromatography DX-320 (Dionex Corp.)
16Nitrate[NO3]-mg/lFritz, MichaelIon chromatography DX-320 (Dionex Corp.)
17Bicarbonate ion[HCO3]-mg/lFritz, MichaelTitration potentiometric, 794 Basic Titrino (Metrohm)
18CalciumCa2+mg/lFritz, MichaelICP-OES, Perkin-Elmer, Optima 3000XL
19PotassiumK+mg/lFritz, MichaelICP-OES, Perkin-Elmer, Optima 3000XL
20MagnesiumMg2+mg/lFritz, MichaelICP-OES, Perkin-Elmer, Optima 3000XL
21SodiumNa+mg/lFritz, MichaelICP-OES, Perkin-Elmer, Optima 3000XL
Size:
1687 data points

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