Bromine, iodine and sodium in surface snow along the 2013 Talos Dome-GV7 traverse (northern Victoria Land, East Antarctica)

Halogen chemistry in the polar regions occurs through the release of halogen elements from different sources. Bromine is primarily emitted from sea salt aerosols and other saline condensed phases associated with sea ice surfaces, while iodine is affected by the release of organic compounds from alga...

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Bibliographic Details
Published in:The Cryosphere
Main Authors: Maffezzoli, N., Spolaor, A., Berto, M., Frezzotti, M., Vallelonga, P., BARBANTE, Carlo
Other Authors: Barbante, Carlo
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
DEEP-DRILLING SITE
SEA-SALT AEROSOL
ICE-CORE
BOUNDARY-LAYER
METHANESULFONIC-ACID
METHANE SULFONATE
ITASE TRAVERSE
LAW DOME
CHEMISTRY
VARIABILITY
Settore CHIM/01 - Chimica Analitica
Southern Ocean
East Antarctica
Austral
Ross Sea
Victoria Land
Law Dome
Talos Dome
Antarc*
Antarctica
ice core
Sea ice
Online Access:http://hdl.handle.net/10278/3687037
https://doi.org/10.5194/tc-11-693-2017
Description
Summary:Halogen chemistry in the polar regions occurs through the release of halogen elements from different sources. Bromine is primarily emitted from sea salt aerosols and other saline condensed phases associated with sea ice surfaces, while iodine is affected by the release of organic compounds from algae colonies living within the sea ice environment. Measurements of halogen species in polar snow samples are limited to a few sites although there is some evidence that they are related to sea ice extent. We examine here total bromine, iodine and sodium concentrations in a series of 2m cores collected during a traverse from Talos Dome (72 degrees 48'S, 159 degrees 06'E) to GV7 (70 degrees 41'S, 158 degrees 51'E) analyzed by inductively coupled plasma-sector field mass spectrometry (ICP-SFMS) at a resolution of 5 cm.We find a distinct seasonality of the bromine enrichment signal in most of the cores, with maxima during the austral spring. Iodine shows average concentrations of 0.04 ppb with little variability. No distinct seasonality is found for iodine and sodium.The transect reveals homogeneous air-to-snow fluxes for the three chemical species along the transect due to competing effects of air masses originating from the Ross Sea and the Southern Ocean.

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