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High-resolution in situ measurement of nitrate in runoff from the Greenland Ice Sheet

Beaton, Alexander D., Wadham, Jemma L., Hawkings, Jon, Bagshaw, Elizabeth A., Lamarche-Gagnon, Guillaume, Mowlem, Matthew C. and Tranter, Martyn 2017. High-resolution in situ measurement of nitrate in runoff from the Greenland Ice Sheet. Environmental Science and Technology 51 (21) , pp. 12518-12527. 10.1021/acs.est.7b03121

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We report the first in situ high-resolution nitrate time series from two proglacial meltwater rivers draining the Greenland Ice Sheet, using a recently developed submersible analyzer based on lab-on-chip (LOC) technology. The low sample volume (320 μL) required by the LOC analyzer meant that low concentration (few micromolar to submicromolar), highly turbid subglacial meltwater could be filtered and colorimetrically analyzed in situ. Nitrate concentrations in rivers draining Leverett Glacier in southwest Greenland and Kiattuut Sermiat in southern Greenland exhibited a clear diurnal signal and a gradual decline at the commencement of the melt season, displaying trends that would not be discernible using traditional daily manual sampling. Nitrate concentrations varied by 4.4 μM (±0.2 μM) over a 10 day period at Kiattuut Sermiat and 3.0 μM (±0.2 μM) over a 14 day period at Leverett Glacier. Marked changes in nitrate concentrations were observed when discharge began to increase. High-resolution in situ measurements such as these have the potential to significantly advance the understanding of nutrient cycling in remote systems, where the dynamics of nutrient release are complex but are important for downstream biogeochemical cycles.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: American Chemical Society
ISSN: 0013-936X
Date of First Compliant Deposit: 11 December 2017
Date of Acceptance: 27 September 2017
Last Modified: 28 Sep 2020 09:45

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