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

High-Resolution in situ measurement of nitrate in runoff from the Greenland Ice Sheet
High-Resolution in situ measurement of nitrate in runoff from the Greenland Ice Sheet
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.
0013-936X
12518-12527
Beaton, Alexander D.
02f38dc0-7db0-488c-af92-465275f9d584
Wadham, Jemma L.
fccc19ee-c691-4f95-bbfd-41f4d4f32c57
Hawkings, Jon
0bdb224b-872a-44d2-9f22-3b09a9e69694
Bagshaw, Elizabeth A.
d34b716f-8162-4788-81a8-03146d5528ed
Lamarche-gagnon, Guillaume
dae8dfa8-f69a-4244-8008-479bdaf4439f
Mowlem, Matthew C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Tranter, Martyn
42ff1b9c-b38f-4943-ab73-2c2d71d2c48b
Beaton, Alexander D.
02f38dc0-7db0-488c-af92-465275f9d584
Wadham, Jemma L.
fccc19ee-c691-4f95-bbfd-41f4d4f32c57
Hawkings, Jon
0bdb224b-872a-44d2-9f22-3b09a9e69694
Bagshaw, Elizabeth A.
d34b716f-8162-4788-81a8-03146d5528ed
Lamarche-gagnon, Guillaume
dae8dfa8-f69a-4244-8008-479bdaf4439f
Mowlem, Matthew C.
6f633ca2-298f-48ee-a025-ce52dd62124f
Tranter, Martyn
42ff1b9c-b38f-4943-ab73-2c2d71d2c48b

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 & Technology, 51 (21), 12518-12527. (doi:10.1021/acs.est.7b03121).

Record type: Article

Abstract

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.

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BeatonNitrate2017_revisied - Accepted Manuscript
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Accepted/In Press date: 27 September 2017
e-pub ahead of print date: 27 September 2017
Published date: 7 November 2017

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Local EPrints ID: 416009
URI: https://eprints.soton.ac.uk/id/eprint/416009
ISSN: 0013-936X
PURE UUID: 4122a7bc-726f-4b45-ae45-857dfb1a50c7

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Date deposited: 30 Nov 2017 17:30
Last modified: 19 Jul 2019 04:11

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Contributors

Author: Alexander D. Beaton
Author: Jemma L. Wadham
Author: Jon Hawkings
Author: Elizabeth A. Bagshaw
Author: Guillaume Lamarche-gagnon
Author: Martyn Tranter

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