Gas diffusion through columnar laboratory sea ice: Implications for mixed-layer ventilation of CO2 in the seasonal ice zone

B. Loose, Peter Schlosser, D. Perovich, D. Ringelberg, D. T. Ho, T. Takahashi, J. Richter-Menge, C. M. Reynolds, W. R. Mcgillis, J. L. Tison

Research output: Contribution to journalArticle

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Abstract

Gas diffusion through the porous microstructure of sea ice represents a pathway for ocean-atmosphere exchange and for transport of biogenic gases produced within sea ice. We report on the experimental determination of the bulk gas diffusion coefficients, D, for oxygen (O2) and sulphur hexafluoride (SF6) through columnar sea ice under constant ice thickness conditions for ice surface temperatures between -4 and -12 °C. Profiles of SF6 through the ice indicate decreasing gas concentration from the ice/water interface to the ice/air interface, with evidence for solubility partitioning between gas-filled and liquid-filled pore spaces. On average, was 1.3 × 10-4 cm2 s-1 (±40%) and was 3.9 × 10-5 cm2 s-1 (±41%). The preferential partitioning of SF6 to the gas phase, which is the dominant diffusion pathway produced the greater rate of SF6 diffusion. Comparing these estimates of D with an existing estimate of the air-sea gas transfer through leads indicates that ventilation of the mixed layer by diffusion through sea ice may be negligible, compared to air-sea gas exchange through fractures in the ice pack, even when the fraction of open water is less than 1%.

Original languageEnglish (US)
Pages (from-to)23-39
Number of pages17
JournalTellus, Series B: Chemical and Physical Meteorology
Volume63
Issue number1
DOIs
StatePublished - Feb 1 2011
Externally publishedYes

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ventilation
mixed layer
sea ice
ice
gas
air
partitioning
ice thickness
pore space
laboratory
gas exchange
open water
microstructure
solubility
surface temperature
sulfur
oxygen
liquid
atmosphere
ocean

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Gas diffusion through columnar laboratory sea ice : Implications for mixed-layer ventilation of CO2 in the seasonal ice zone. / Loose, B.; Schlosser, Peter; Perovich, D.; Ringelberg, D.; Ho, D. T.; Takahashi, T.; Richter-Menge, J.; Reynolds, C. M.; Mcgillis, W. R.; Tison, J. L.

In: Tellus, Series B: Chemical and Physical Meteorology, Vol. 63, No. 1, 01.02.2011, p. 23-39.

Research output: Contribution to journalArticle

Loose, B. ; Schlosser, Peter ; Perovich, D. ; Ringelberg, D. ; Ho, D. T. ; Takahashi, T. ; Richter-Menge, J. ; Reynolds, C. M. ; Mcgillis, W. R. ; Tison, J. L. / Gas diffusion through columnar laboratory sea ice : Implications for mixed-layer ventilation of CO2 in the seasonal ice zone. In: Tellus, Series B: Chemical and Physical Meteorology. 2011 ; Vol. 63, No. 1. pp. 23-39.
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