High-Resolution in Situ Measurement of Nitrate in Runoff from the Greenland Ice Sheet

被引：37

作者：

Beaton, Alexander D. ^{[1
]}

Wadham, Jemma L. ^{[2
]}

Hawkings, Jon ^{[2
]}

Bagshaw, Elizabeth A. ^{[3
]}

Lamarche-Gagnon, Guillaume ^{[2
]}

Mowlem, Matthew C. ^{[1
]}

Tranter, Martyn ^{[2
]}

机构：

[1] Natl Oceanog Ctr, European Way, Southampton SO14 3ZH, Hants, England

[2] Univ Bristol, Bristol Glaciol Ctr, Univ Rd, Bristol BS8 1SS, Avon, England

[3] Cardiff Univ, Sch Ocean & Earth Sci, Cardiff CF10 3AT, S Glam, Wales

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2017年 / 51卷 / 21期

关键词：

FLOW-INJECTION ANALYZER; NITROGEN; CHEMISTRY; MELTWATER; DYNAMICS; GLACIER; SENSORS; NITRITE; BENEATH; EXPORT;

D O I：

10.1021/acs.est.7b03121

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 mu L) 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 mu M (+/- 0.2 mu M) over a 10 day period at Kiattuut Sermiat and 3.0 mu M (+/- 0.2 mu M) 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.

引用

页码：12518 / 12527

页数：10

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