Effect of glacial drainage water on the CO2 system and ocean acidification state in an Arctic tidewater-glacier fjord during two contrasting years

Fransson, Agneta; Chierici, Melissa; Nomura, Daiki; Granskog, Mats A.; Kristiansen, Svein; Martma, Tõnu; Nehrke, Gernot

Effect of glacial drainage water on the CO2 system and ocean acidification state in an Arctic tidewater-glacier fjord during two contrasting years

Fransson, Agneta; Chierici, Melissa; Nomura, Daiki et al.

Journal of Geophysical Research : Oceans, 2015, 120(4), 2413-2429

Permalink : https://hdl.handle.net/2115/70590

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アクセス権	open access
URI	https://hdl.handle.net/2115/70590
タイトル	Effect of glacial drainage water on the CO2 system and ocean acidification state in an Arctic tidewater-glacier fjord during two contrasting years
著者	Fransson, Agneta ; Chierici, Melissa ; Nomura, Daiki ; Granskog, Mats A. ; Kristiansen, Svein ; Martma, Tõnu ; Nehrke, Gernot
著者名 Fransson, Agneta
著者名 Chierici, Melissa
e-Rad_Researcher 70550739 著者名 Nomura, Daiki
著者名 Granskog, Mats A.
著者名 Kristiansen, Svein
著者名 Martma, Tõnu
著者名 Nehrke, Gernot
言語	英語
キーワード	carbonate system
	fjord chemistry
	land-ocean interaction
	freshwater
	carbonitic bedrock
	primary production
	atmospheric CO 2 uptake
	West-Spitsbergen shelf
	Svalbard
発行日	2015-04-02
出版者	Wiley
収録物名	Journal of Geophysical Research : Oceans
巻(号)	120(4)
ページ	2413-2429
抄録	In order to investigate the effect of glacial water on the CO2 system in the fjord, we studied the variability of the total alkalinity (AT), total dissolved inorganic carbon (CT), dissolved inorganic nutrients, oxygen isotopic ratio (δ18O), and freshwater fractions from the glacier front to the outer Tempelfjorden on Spitsbergen in winter 2012 (January, March, and April) and 2013 (April) and summer/fall 2013 (September). The two contrasting years clearly showed that the influence of freshwater, mixing, and haline convection affected the chemical and physical characteristics of the fjord. The seasonal variability showed the lowest calcium carbonate saturation state (Ω) and pH values in March 2012 coinciding with the highest freshwater fractions. The highest Ω and pH were found in September 2013, mostly due to CO2 uptake during primary production. Overall, we found that increased freshwater supply decreased Ω, pH, and AT. On the other hand, we observed higher AT relative to salinity in the freshwater end‐member in the mild and rainy winter of 2012 (1142 μmol kg−1) compared to AT in 2013 (526 μmol kg−1). Observations of calcite and dolomite crystals in the glacial ice suggested supply of carbonate‐rich glacial drainage water to the fjord. This implies that winters with a large amount of glacial drainage water partly provide a lessening of further ocean acidification, which will also affect the air‐sea CO2 exchange.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2015 The Authors
PISSN	2169-9275
EISSN	2169-9291
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1002/2014JC010320