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Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet

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Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. / Kohler, T. J.; Žárský, J. D.; Yde, J. C.; Lamarche-Gagnon, G.; Hawkings, J. R.; Tedstone, A. J.; Wadham, J. L.; Box, J. E.; Beaton, Alex D; Stibal, Marek.

In: Geophysical Research Letters, Vol. 44, No. 12, 28.06.2017, p. 6209-6217.

Research output: Contribution to journalArticle

Harvard

Kohler, TJ, Žárský, JD, Yde, JC, Lamarche-Gagnon, G, Hawkings, JR, Tedstone, AJ, Wadham, JL, Box, JE, Beaton, AD & Stibal, M 2017, 'Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet', Geophysical Research Letters, vol. 44, no. 12, pp. 6209-6217. https://doi.org/10.1002/2017GL073219

APA

Kohler, T. J., Žárský, J. D., Yde, J. C., Lamarche-Gagnon, G., Hawkings, J. R., Tedstone, A. J., ... Stibal, M. (2017). Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. Geophysical Research Letters, 44(12), 6209-6217. https://doi.org/10.1002/2017GL073219

Vancouver

Kohler TJ, Žárský JD, Yde JC, Lamarche-Gagnon G, Hawkings JR, Tedstone AJ et al. Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. Geophysical Research Letters. 2017 Jun 28;44(12):6209-6217. https://doi.org/10.1002/2017GL073219

Author

Kohler, T. J. ; Žárský, J. D. ; Yde, J. C. ; Lamarche-Gagnon, G. ; Hawkings, J. R. ; Tedstone, A. J. ; Wadham, J. L. ; Box, J. E. ; Beaton, Alex D ; Stibal, Marek. / Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. In: Geophysical Research Letters. 2017 ; Vol. 44, No. 12. pp. 6209-6217.

Bibtex

@article{2cd6c5d89a5d483083115a21b92a132c,
title = "Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet",
abstract = "Surface melt from the Greenland Ice Sheet (GrIS) collects particulate organic carbon (POC) as it drains into subglacial environments and transports it downstream where it serves as a microbial substrate. We hypothesized that older POC is entrained by meltwaters as the subglacial drainage network expands upglacier over the summer. To test this, POC samples were collected from a meltwater river exiting the GrIS over an ablation season and 14C dated. Resulting values were compared with meltwater hydrochemistry and satellite observations of the catchment area. We found that POC ages increased from ~5000 to ~9000 years B.P. until peak discharge and catchment size. Afterward, significant fluctuations in POC age were observed, interpreted to result from periods of high and low subglacial hydrological pressure and sediment supply and subsequent exhaustion. These observations suggest a seasonal progression in the source of POC exported from the GrIS and provide evidence for a seasonally evolving subglacial drainage system.",
keywords = "glacial hydrology, Kangerlussuaq, Leverett Glacier, meltwater export, particulate organic carbon, subglacial drainage system",
author = "Kohler, {T. J.} and Ž{\'a}rsk{\'y}, {J. D.} and Yde, {J. C.} and G. Lamarche-Gagnon and Hawkings, {J. R.} and Tedstone, {A. J.} and Wadham, {J. L.} and Box, {J. E.} and Beaton, {Alex D} and Marek Stibal",
year = "2017",
month = "6",
day = "28",
doi = "10.1002/2017GL073219",
language = "English",
volume = "44",
pages = "6209--6217",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "12",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet

AU - Kohler, T. J.

AU - Žárský, J. D.

AU - Yde, J. C.

AU - Lamarche-Gagnon, G.

AU - Hawkings, J. R.

AU - Tedstone, A. J.

AU - Wadham, J. L.

AU - Box, J. E.

AU - Beaton, Alex D

AU - Stibal, Marek

PY - 2017/6/28

Y1 - 2017/6/28

N2 - Surface melt from the Greenland Ice Sheet (GrIS) collects particulate organic carbon (POC) as it drains into subglacial environments and transports it downstream where it serves as a microbial substrate. We hypothesized that older POC is entrained by meltwaters as the subglacial drainage network expands upglacier over the summer. To test this, POC samples were collected from a meltwater river exiting the GrIS over an ablation season and 14C dated. Resulting values were compared with meltwater hydrochemistry and satellite observations of the catchment area. We found that POC ages increased from ~5000 to ~9000 years B.P. until peak discharge and catchment size. Afterward, significant fluctuations in POC age were observed, interpreted to result from periods of high and low subglacial hydrological pressure and sediment supply and subsequent exhaustion. These observations suggest a seasonal progression in the source of POC exported from the GrIS and provide evidence for a seasonally evolving subglacial drainage system.

AB - Surface melt from the Greenland Ice Sheet (GrIS) collects particulate organic carbon (POC) as it drains into subglacial environments and transports it downstream where it serves as a microbial substrate. We hypothesized that older POC is entrained by meltwaters as the subglacial drainage network expands upglacier over the summer. To test this, POC samples were collected from a meltwater river exiting the GrIS over an ablation season and 14C dated. Resulting values were compared with meltwater hydrochemistry and satellite observations of the catchment area. We found that POC ages increased from ~5000 to ~9000 years B.P. until peak discharge and catchment size. Afterward, significant fluctuations in POC age were observed, interpreted to result from periods of high and low subglacial hydrological pressure and sediment supply and subsequent exhaustion. These observations suggest a seasonal progression in the source of POC exported from the GrIS and provide evidence for a seasonally evolving subglacial drainage system.

KW - glacial hydrology

KW - Kangerlussuaq

KW - Leverett Glacier

KW - meltwater export

KW - particulate organic carbon

KW - subglacial drainage system

UR - http://www.scopus.com/inward/record.url?scp=85021229211&partnerID=8YFLogxK

U2 - 10.1002/2017GL073219

DO - 10.1002/2017GL073219

M3 - Article

AN - SCOPUS:85021229211

VL - 44

SP - 6209

EP - 6217

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 12

ER -