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Tropical and Mid-latitude Forcing of Continental Antarctic Temperatures : Volume 9, Issue 4 (30/07/2015)

By Turney, C. S. M.

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Book Id: WPLBN0004023242
Format Type: PDF Article :
File Size: Pages 24
Reproduction Date: 2015

Title: Tropical and Mid-latitude Forcing of Continental Antarctic Temperatures : Volume 9, Issue 4 (30/07/2015)  
Author: Turney, C. S. M.
Volume: Vol. 9, Issue 4
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Klekociuk, A., Van Ommen, T. D., Fogwill, C. J., J. Curra, M. A., M. Turne, C. S., Palmer, J. G., & Moy, A. D. (2015). Tropical and Mid-latitude Forcing of Continental Antarctic Temperatures : Volume 9, Issue 4 (30/07/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Climate Change Research Centre, University of New South Wales, Sydney, Australia. Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue more acute than across the mid- to high-latitudes of the Southern Hemisphere (SH) which over the last few decades has experienced extreme and regional variable trends in precipitation, ocean circulation, and temperature, with major implications for Antarctic ice melt and surface mass balance. Unfortunately there is a relative dearth of observational data, limiting our understanding of the driving mechanism(s). Here we report a new 130-year annually-resolved record of δ D – a proxy for temperature – from the South Geographic Pole where we find a significant influence from extra-tropical pressure anomalies which act as gatekeepers to the meridional exchange of air masses. Reanalysis of global atmospheric circulation suggests these pressure anomalies play a considerably larger influence on mid- to high-latitude SH climate than hitherto believed, modulated by the tropical Pacific Ocean. Our findings suggest that future increasing tropical warmth will strengthen meridional circulation, exaggerating current trends, with potentially significant impacts on Antarctic surface mass balance.

Summary
Tropical and mid-latitude forcing of continental Antarctic temperatures

Excerpt
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