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Frost flowers on sea ice as a source of sea salt and their influence on tropospheric halogen chemistry

Kaleschke, L.; Richter, A.; Burrows, J.; Afe, O.; Heygster, G.; Notholt, J.; Rankin, A.M.; Roscoe, H.K.; Hollwedel, J.; Wagner, T.; Jacobi, H.-W.. 2004 Frost flowers on sea ice as a source of sea salt and their influence on tropospheric halogen chemistry. Geophysical Research Letters, 31 (16), L16114. 4, pp. 10.1029/2004GL020655

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Abstract/Summary

Frost flowers grow on newly-formed sea ice from a saturated water vapour layer. They provide a large effective surface area and a reservoir of sea salt ions in the liquid phase with triple the ion concentration of sea water. Recently, frost flowers have been recognised as the dominant source of sea salt aerosol in the Antarctic, and it has been speculated that they could be involved in processes causing severe tropospheric ozone depletion events during the polar sunrise. These events can be explained by heterogeneous autocatalytic reactions taking place on salt-laden ice surfaces which exponentially increase the reactive gas phase bromine ("bromine explosion"). We analyzed tropospheric bromine monoxide (BrO) and the sea ice coverage both measured from satellite sensors. Our model based interpretation shows that young ice regions potentially covered with frost flowers seem to be the source of bromine found in bromine explosion events.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2004GL020655
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Signals in Antarctica of Past Global Changes
ISSN: 0094-8276
NORA Subject Terms: Glaciology
Atmospheric Sciences
Chemistry
Date made live: 19 Jan 2012 11:18
URI: http://nora.nerc.ac.uk/id/eprint/12218

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