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Optimal site selection for a high-resolution ice core record in East Antarctica

Citation

Vance, TR and Roberts, JL and Moy, AD and Curran, MAJ and Tozer, CR and Gallant, AJE and Abram, NJ and van Ommen, TD and Young, DA and Grima, C and Blankenship, DD and Siegert, MJ, Optimal site selection for a high-resolution ice core record in East Antarctica, Climate of the Past, 12, (3) pp. 595-610. ISSN 1814-9324 (2016) [Refereed Article]


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Copyright Statement

Author(s) 2016. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.5194/cp-12-595-2016

Abstract

Ice cores provide some of the best-dated and most comprehensive proxy records, as they yield a vast and growing array of proxy indicators. Selecting a site for ice core drilling is nonetheless challenging, as the assessment of potential new sites needs to consider a variety of factors. Here, we demonstrate a systematic approach to site selection for a new East Antarctic high-resolution ice core record. Specifically, seven criteria are considered: (1) 2000-year-old ice at 300 m depth; (2) above 1000 m elevation; (3) a minimum accumulation rate of 250 mm years−1 IE (ice equivalent); (4) minimal surface reworking to preserve the deposited climate signal; (5) a site with minimal displacement or elevation change in ice at 300 m depth; (6) a strong teleconnection to midlatitude climate; and (7) an appropriately complementary relationship to the existing Law Dome record (a high-resolution record in East Antarctica). Once assessment of these physical characteristics identified promising regions, logistical considerations (for site access and ice core retrieval) were briefly considered. We use Antarctic surface mass balance syntheses, along with ground-truthing of satellite data by airborne radar surveys to produce all-of-Antarctica maps of surface roughness, age at specified depth, elevation and displacement change, and surface air temperature correlations to pinpoint promising locations. We also use the European Centre for Medium-Range Weather Forecast ERA 20th Century reanalysis (ERA-20C) to ensure that a site complementary to the Law Dome record is selected. We find three promising sites in the Indian Ocean sector of East Antarctica in the coastal zone from Enderby Land to the Ingrid Christensen Coast (50100 E). Although we focus on East Antarctica for a new ice core site, the methodology is more generally applicable, and we include key parameters for all of Antarctica which may be useful for ice core site selection elsewhere and/or for other purposes.

Item Details

Item Type:Refereed Article
Keywords:ice cores, glaciology, ice dynamics, ice mapping
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Vance, TR (Dr Tessa Vance)
Author:Roberts, JL (Dr Jason Roberts)
Author:Moy, AD (Dr Andrew Moy)
Author:Curran, MAJ (Dr Mark Curran)
Author:Tozer, CR (Dr Carly Tozer)
Author:van Ommen, TD (Dr Tas van Ommen)
ID Code:107743
Year Published:2016
Web of Science® Times Cited:6
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2016-03-23
Last Modified:2017-10-30
Downloads:61 View Download Statistics

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