Landfast sea ice in the Bothnian Bay (Baltic Sea) as a temporary storage compartment for greenhouse gases

[en] Although studies of biogeochemical processes in polar sea ice have been increasing, similar research on relatively warm low-salinity sea ice remains sparse. In this study, we investigated biogeochemical properties of the landfast sea ice cover in the brackish Bothnian Bay (Northern Baltic Sea) and the possible role of this sea ice in mediating the exchange of greenhouse gases, including carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) across the water column–sea ice–atmosphere interface. Observations of total alkalinity and dissolved inorganic carbon in both landfast sea ice and the water column suggest that the carbonate system is mainly driven by salinity. While high CH4 and N2O concentrations were observed in both the water column (up to 14.3 and 17.5 nmol L–1, respectively) and the sea ice (up to 143.6 and 22.4 nmol L–1, respectively),these gases appear to be enriched in sea ice compared to the water column.This enrichment may be attributable to the sea ice formation process, which concentrates impurities within brine. As sea ice temperature and brine volume decrease, gas solubility decreases as well, promoting the formation of bubbles. Gas bubbles originating from underlying sediments may also be incorporated within the ice cover and contribute to the enrichment in sea ice.The fate of these greenhouse gases within the ice merits further research, as storage in this low-salinity seasonal sea ice is temporary. Copyright: © 2021 The Author(s).

Research center :

FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège

Disciplines :

Earth sciences & physical geography

Author, co-author :

Geilfus, N.-X.; Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada

Munson, K. M.; Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada, Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, WA, United States

Eronen-Rasimus, E.; Department of Microbiology, University of Helsinki, Helsinki, Finland, Finnish Environment Institute, SYKE, Helsinki, Finland

Kaartokallio, H.; Finnish Environment Institute, SYKE, Helsinki, Finland

Lemes, M.; Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada

Wang, F.; Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada

Rysgaard, S.; Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada, Arctic Research Center, Aarhus University, Aarhus, Denmark

Delille, Bruno ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (COU)

Language :

English

Title :

Landfast sea ice in the Bothnian Bay (Baltic Sea) as a temporary storage compartment for greenhouse gases

Publication date :

2021

Journal title :

Elementa: Science of the Anthropocene

eISSN :

2325-1026

Publisher :

University of California Press

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://online.ucpress.edu/elementa/article/9/1/00028/118996/Landfast-sea-ice-in-the-Bothnian-Bay-Baltic-Sea-as

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Available on ORBi :

since 01 February 2022

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