Pedersen, Joel A; Simpson, Myrna A; Bockheim, James G; Kumar, Kartik (2011): Drained thaw-lake basin soil characteristics of cores from Barrow, Alaska [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818010, Supplement to: Pedersen, JA et al. (2011): Characterization of soil organic carbon in drained thaw-lake basins of Arctic Alaska using NMR and FTIR photoacoustic spectroscopy. Organic Geochemistry, 42(8), 947-954, https://doi.org/10.1016/j.orggeochem.2011.04.003
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Abstract:
Arctic soils contain a large fraction of Earth's stored carbon. Temperature increases in the Arctic may enhance decomposition of this stored carbon, shifting the role of Arctic soils from a net sink to a new source of atmospheric CO2. Predicting the impact of Arctic warming on soil carbon reserves requires knowledge of the composition of the stored organic matter. Here, we employ solid state 13C nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared-photoacoustic spectroscopy (FTIR-PAS) to investigate the chemical composition of soil organic matter collected from drained thaw-lake basins ranging in age from 0 to 5500 years before present (y BP). The 13C NMR and FTIR-PAS data were largely congruent. Surface horizons contain relatively large amounts of O-alkyl carbon, suggesting that the soil organic matter is rich in labile constituents. Soil organic matter decreases with depth with the relative amounts of O-alkyl carbon decreasing and aromatic carbon increasing. These data indicate that lower horizons are in a more advanced stage of decomposition than upper horizons. Nonetheless, a substantial fraction of carbon in lower horizons, even for ancient thaw-lake basins (2000-5500 y BP), is present as O-alkyl carbon reflecting the preservation of intrinsically labile organic matter constituents. Climate change-induced increases in the depth of the soil active layer are expected to accelerate the depletion of this carbon.
Project(s):
Coverage:
Median Latitude: 71.236480 * Median Longitude: -156.550527 * South-bound Latitude: 71.198600 * West-bound Longitude: -156.668000 * North-bound Latitude: 71.277500 * East-bound Longitude: -156.435000
Date/Time Start: 2005-01-01T00:00:00 * Date/Time End: 2007-01-01T00:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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2 datasets
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Datasets listed in this publication series
- Pedersen, JA; Simpson, MA; Bockheim, JG et al. (2011): (Table 2) Solid state 13C CP/MAS integration results for the thaw-lake samples from Barrow, Alaska. https://doi.org/10.1594/PANGAEA.818009
- Pedersen, JA; Simpson, MA; Bockheim, JG et al. (2011): (Table 1) Organic carbon and nitrogen content of drained thaw-lake basin soil samples from Barrow, Alaska. https://doi.org/10.1594/PANGAEA.818008