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

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

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116114k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 16, CiteID L16114

Physics

53

Atmospheric Composition And Structure: Constituent Sources And Sinks, Global Change: Remote Sensing, Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

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.

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