Permafrost thermal regime from two 30-m deep boreholes in So

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TitlePermafrost thermal regime from two 30-m deep boreholes in Southern Victoria Land, AntarcticaAbstractTwo 30-m deep permafrost temperature-monitoring boreholes were installed in bedrock, one at Marble Point and one in the Wright Valley, in the Ross Sea region of Antarctica. A soil climate-monitoring station in till is located near each borehole. The ground surface temperature (GST) was highly correlated with the air temperature at both sites in 2008. Thermal offsets were small (<1^circC) in the till and negligible in the boreholes. The active layer was thicker in the boreholes than in the till, presumably because of the higher thermal diffusivity of the rock. The measured depth of zero annual temperature amplitude was around 27m at Wright Valley and 25m at Marble Point. Permafrost thickness was estimated at about 680m at Wright Valley and 490m at Marble Point. The GST history, reconstructed using an inversion procedure, suggests a slight cooling from 1998 to 2003 followed by a slight warming to 2008. Longer temperature records or deeper boreholes would be required to establish if long-term climate change has occurred. ©2011 John Wiley & Sons, Ltd.AcknowledgementsThanks go to Antarctica New Zealand and PNRA for logistic support. The project was realised in the framework of the ANTPAS International Polar Year. This project was partially funded by the New Zealand Foundation for Research Science and Technology (FRST grant C09X0307) and the PNRA project 5.3 Permafrost and Climate Change in Antarctica. Rock thermal properties were determined by A. Lindemann and A. Schopper of Netzsch Gmbh. Dr C. Seybold and D. Harms, NRCS, USDA assisted with borehole temperature datalogger installation and maintenance. Finally, we want to thank the two anonymous reviewers and Professor Antoni Lewkowicz for their useful and constructive comments and suggestions.

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1st AuthorGuglielmin, M.AuthorGuglielmin, M.Balks, M.Adlam, L.Baio, F.Year2011JournalPermafrost and Periglacial ProcessesVolume22Number2Pages129-139DOI10.1002/ppp.715URLhttps://www.scopus.com/inward/recor.....3e8b016241b971be352be59c4Keywordsactive layerair temperaturebedrockboreholeclimate changepermafrostsoil temperaturesurface temperaturethermal regime, AntarcticaEast AntarcticaMarble PointMcMurdo Dry ValleysVictoria LandWright Valley, rank5Author KeywordsActive layerAntarcticaMcMurdo Dry ValleysPermafrost temperatureSoil temperatureThermal properties

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TypeArticleCitationGuglielmin, M., Balks, M., Adlam, L. and Baio, F. (2011). Permafrost thermal regime from two 30-m deep boreholes in Southern Victoria Land, Antarctica. Permafrost and Periglacial Processes, 22(2): 129-139IdentifierGuglielmin2011Relevancerank5

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Balks, M.