Physical controls on the storage of methane in landfast sea ice

[en] We report on methane (CH4) dynamics in landfast sea ice, brine and under-ice seawater at Barrow in 2009. The CH4 concentrations in under-ice water ranged between 25.9 and 116.4 nmol L-1sw, indicating a supersaturation of 700 to 3100 % relative to the atmosphere. In comparison, the CH4 concentrations in sea ice, ranged between 3.4 and 17.2 nmol L-1ice, and the deduced CH4 concentrations in brine, between 13.2 and 677.7 nmol L-1brine. We investigated on the processes explaining the difference in CH4 concentrations between sea ice, brine and the under-ice water, and suggest that biological controls on the storage of CH4 in ice was minor in comparison to the physical controls. Two physical processes regulated the storage of CH4 in our landfast ice samples: bubble formation within the ice and sea ice permeability. Gas bubble formation from solubility changes had favoured the accumulation of CH4 in the ice at the beginning of ice growth. CH4 retention in sea ice was then twice as efficient as that of salt; this also explains the overall higher CH4 concentrations in brine than in the under-ice water. As sea ice thickened, gas bubble formation became less efficient, CH4 was then mainly trapped in the dissolved state. The increase of sea ice permeability during ice melt marked the end of CH4 storage.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Zhou, Jiayun ; Université de Liège - ULiège > Form.doct. sc. (océanographie - Bologne)

Tison, Jean-Louis

Carnat, G.

Geilfus, Nicolas-Xavier

Delille, Bruno ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Unité d'Océanographie chimique (UOC)

Language :

English

Title :

Physical controls on the storage of methane in landfast sea ice

Publication date :

June 2014

Journal title :

The Cryosphere

ISSN :

1994-0416

eISSN :

1994-0424

Publisher :

Copernicus Publications

Volume :

Issue :

Pages :

1019-1029

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.the-cryosphere.net/8/1019/2014/

Funders :

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

Available on ORBi :

since 20 April 2014

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