Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10370079" target="_blank" >RIV/00216208:11310/17:10370079 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/2017GL073219" target="_blank" >http://dx.doi.org/10.1002/2017GL073219</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/2017GL073219" target="_blank" >10.1002/2017GL073219</a>
Alternative languages
Result language
angličtina
Original language name
Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet
Original language description
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 C-14 dated. Resulting values were compared with meltwater hydrochemistry and satellite observations of the catchment area. We found that POC ages increased from similar to 5000 to similar 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GJ15-17346Y" target="_blank" >GJ15-17346Y: The bright future of subglacial ecosystems: Impacts of deglaciation on microbial activity and carbon cycling at glacier beds</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geophysical Research Letters
ISSN
0094-8276
e-ISSN
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Volume of the periodical
44
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
6209-6217
UT code for WoS article
000405854200039
EID of the result in the Scopus database
2-s2.0-85021229211