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Twentieth-century surface temperature trends in the western Ross Sea, Antarctica: Evidence from a high-resolution ice core

Citation

Sinclair, KE and Bertler, NAN and van Ommen, TD, Twentieth-century surface temperature trends in the western Ross Sea, Antarctica: Evidence from a high-resolution ice core, Journal of Climate, 25, (10) pp. 3629-3636. ISSN 0894-8755 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 American Meteorological Society

DOI: doi:10.1175/JCLI-D-11-00496.1

Abstract

A 125-yr ice core record of climate from the Whitehall Glacier ice divide provides exceptionally high-resolution stable isotope data from the northwest margin of the Ross Sea, Antarctica. This is the only proxy data available to extend the instrumental record of temperature in this region, where little is known about climate variability over the past two centuries. Using ECMWF Interim Re-Analysis (ERA-Interim) data, this study develops a precipitation-weighted δ18O-temperature transfer function of 0.62‰ °C−1, which is comparable to other proximal ice cores, such as Taylor, Talos, and Law Domes. Reconstructed mean annual temperatures show no significant change between 1882 and 2006. However, a decrease in cold season [April–September (AMJJAS)] temperatures of −1.59° ± 0.84°C decade−1 (at 90% confidence) is observed since 1979. This cooling trend is in contrast to a surface temperature record from Ross Island (Scott Base) where significant spring warming is observed. It is also coincident with a positive trend in the southern annular mode, which is linked to stronger southerly winds and increased sea ice extent and duration in the western Ross Sea.

Item Details

Item Type:Refereed Article
Keywords:surface temperature trends, ice core, Ross Sea
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 Environmental Sciences
Author:van Ommen, TD (Dr Tas van Ommen)
ID Code:80555
Year Published:2012
Web of Science® Times Cited:6
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-11-02
Last Modified:2017-10-30
Downloads:296 View Download Statistics

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