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- Title
Sea ice-related halogen enrichment at Law Dome, coastal East Antarctica.
- Authors
Vallelonga, Paul; Maffezzoli, Niccolo; Moy, Andrew D.; Curran, Mark A. J.; Vance, Tessa R.; Edwards, Ross; Hughes, Gwyn; Barker, Emily; Spreen, Gunnar; Saiz-Lopez, Alfonso; Corella, J. Pablo; Cuevas, Carlos A.; Spolaor, Andrea
- Abstract
The Law Dome site is ideal for the evaluation of sea ice proxies due to its location near to the Antarctic coast, regular and high accumulation throughout the year, an absence of surface melting or remobilization, and minimal multiyear sea ice. We present records of bromine and iodine concentrations and their enrichment beyond seawater compositions, arguing that halogen enrichment is indicative of the local sea ice area, particularly the 90-110° E sector of the Wilkes coast. Our findings support the results of previous studies of sea ice variability from Law Dome, indicating that Wilkes coast sea ice area is currently at its lowest level since the start of the 20th century. From the Law Dome DSS1213 firn core, 26 years of monthly deposition data indicate that the period of peak bromine enrichment is during Austral spring-summer, from November to February. Results from a traverse along the lee (Western) side of Law Dome show low levels of sodium and bromine deposition, with the greatest fluxes in the vicinity of the Law Dome summit. Finally, iodine enrichment is well correlated to that of bromine, indicating a common, sea ice source for their enrichment.
- Subjects
EAST Antarctica (Antarctica); SEA ice; HALOGENS; SEAWATER composition; SEDIMENTATION &; deposition
- Publication
Climate of the Past Discussions, 2016, p1
- ISSN
1814-9324
- Publication type
Article
- DOI
10.5194/cp-2016-74