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Incorporation of nitrogen compounds into sea ice from atmospheric deposition

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Title: Incorporation of nitrogen compounds into sea ice from atmospheric deposition
Authors: Nomura, Daiki Browse this author →KAKEN DB
McMinn, Andrew Browse this author
Hattori, Hiroshi Browse this author →KAKEN DB
Aoki, Shigeru Browse this author
Fukuchi, Mitsuo Browse this author
Keywords: Nutrient
Sea ice
Snow
Malting
Sea of Okhotsk
Issue Date: 20-Dec-2011
Publisher: Elsevier
Journal Title: Marine Chemistry
Volume: 127
Issue: 1-4
Start Page: 90
End Page: 99
Publisher DOI: 10.1016/j.marchem.2011.08.002
Abstract: Temporal measurements of temperature, salinity, water–oxygen isotopic ratio and nutrient concentrations at Saroma-ko Lagoon, southern Sea of Okhotsk, were made in February–March 2008 to examine the processes by which nitrogen compounds from the atmosphere were incorporated via snowfall into sea ice. Granular ice made up more than half the ice thickness, and the mass fraction of snow in the snow-ice layer on top of the ice ranged from 0.8% to 46.9%. The high concentrations of NO3− + NO2− and NH4+ observed in the snow and snow-ice throughout the study period were likely due to the proximity of the study site, in northern Japan, to the east coast of the Asian continent. Pollutants containing high NO3−and NH4+ concentrations are transported from East Asia and deposited in snowfall over the sea ice in the southern part of the Sea of Okhotsk. Compared with NO3− + NO2− and NH4+ concentrations, PO43− concentrations in the snow and snow-ice were low. The strong correlation between the NO3− + NO2− and NH4+ concentrations in the snow-ice and the mass fraction of snow indicates that the nitrogen compounds on top of the sea ice were controlled mainly by the snow contribution to the sea ice when snow-ice predominated. Our results indicate that chemical cycles in sea ice can be affected by polluted precipitation (snow) originating from a nonpolar sea.
Rights: © 2011. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-sa/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/70581
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

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