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Vallelonga, Paul T; Maffezzoli, Niccolò; Moy, Andrew D; Curran, Mark A J; Vance, Tessa R; Edwards, Ross L; Hughes, Gwyn; Barker, Emily; Spreen, Gunnar; Saiz-Lopez, Alfonso; Corella, Juan Pablo; Cuevas, Carlos Alberto; Spolaor, Andrea (2016): Law Dome Br, Na, I (1927-2016) and sea ice (1973-2015) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.868431, Supplement to: Vallelonga, PT et al. (2016): Sea ice-related halogen enrichment at Law Dome, coastal East Antarctica. Climate of the Past Discussions, 1-26, https://doi.org/10.5194/cp-2016-74

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Published: 2016-11-15 • DOI registered: 2017-01-03

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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 and compare these to satellite observations of first year sea ice area in the 90-130° 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, multidecadal variability in iodine enrichment appears well correlated to bromine enrichment, suggesting a common source of variability that may be related to the Interdecadal Pacific Oscillation (IPO).
Coverage:
Median Latitude: -66.734046 * Median Longitude: 112.659218 * South-bound Latitude: -66.800000 * West-bound Longitude: 111.000000 * North-bound Latitude: -66.300000 * East-bound Longitude: 112.811275
Date/Time Start: 2005-11-08T00:00:00 * Date/Time End: 2016-02-10T00:00:00
Event(s):
DSS0506 (Law Dome summit) * Latitude: -66.772130 * Longitude: 112.807110 * Date/Time Start: 2005-11-08T00:00:00 * Date/Time End: 2005-12-01T00:00:00 * Elevation: 1370.0 m * Recovery: 258 m * Location: Law Dome, Wilkes Land, Antarctica * Method/Device: Ice drill (ICEDRILL) * Comment: A 258 m deep ice core was drilled using a 20 cm diameter thermal drill near to the Law Dome summit
DSS1213 (Law Dome summit) * Latitude: -66.772500 * Longitude: 112.811270 * Date/Time: 2013-02-05T00:00:00 * Elevation: 1370.0 m * Recovery: 30 m * Location: Law Dome, Wilkes Land, Antarctica * Method/Device: Mark VI motorized coring device, Kovacs Enterprise Inc (MARKVI) * Comment: In austral summer 2012/2013, a 30 m firn core was drilled at DSS, Law Dome
Law_Dome_Snow_Pit (Law Dome summit) * Latitude: -66.773197 * Longitude: 112.811275 * Date/Time: 2016-02-10T00:00:00 * Elevation: 1370.0 m * Location: Law Dome, Wilkes Land, Antarctica * Method/Device: Snow pit (SNOWPIT)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Br, Na, and I concentration in ice core DSS0506. https://doi.org/10.1594/PANGAEA.868422
  2. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Annual mean Br, Na, and I concentration in ice core DSS0506. https://doi.org/10.1594/PANGAEA.868423
  3. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Br, and Na concentration in firn core DSS1213. https://doi.org/10.1594/PANGAEA.868425
  4. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Annual mean Br, and Na concentration in firn core DSS1213. https://doi.org/10.1594/PANGAEA.868427
  5. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Element concentrations of snowpit samples of Law Dome. https://doi.org/10.1594/PANGAEA.868428
  6. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Na and Br concentrations and fluxes of snowpit samples of a traverse from Casey Station to Dome Summit South Campsite. https://doi.org/10.1594/PANGAEA.868429
  7. Vallelonga, PT; Maffezzoli, N; Moy, AD et al. (2016): Sea ice calculations for two sectors off East Antarctica. https://doi.org/10.1594/PANGAEA.868430