La glace de mer arctique : source ou puits d'oxyde nitreux?
|Advisor:||Levasseur, Maurice; Scarratt, Michael Grant|
|Abstract:||Nitrous oxide (N2O) is a greenhouse gas which also plays a role in stratospheric ozone depletion. The objective of this study was to demonstrate the presence of N2O in Arctic sea ice, and to quantify the impact of this potential source to the atmosphere. Bulk concentrations of N2O in the bottom 10 cm of the sea ice and in the underlying surface waters were measured in the Beaufort Sea from March to April 2008. Our sea ice measurements revealed low N2O bulk concentrations with N2O being consistently undersaturated with respect to the underlying surface water (ca. 40% saturation) and the atmosphere (ca. 30% saturation). The most plausible mechanism to explain the low N2O sea ice concentrations is a loss of N2O via brine rejection during sea ice formation in autumn and winter. Sea ice could thus act as a source of N2O via brine rejection during sea ice formation in autumn and winter.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||16 April 2018|
|Collection:||Thèses et mémoires|
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