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| Titel |
Tropical and mid-latitude forcing of continental Antarctic temperatures |
| VerfasserIn |
C. S. M. Turney, C. J. Fogwill, A. R. Klekociuk, T. D. Van Ommen, M. A. J. Curran, A. D. Moy, J. G. Palmer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 6 ; Nr. 9, no. 6 (2015-12-21), S.2405-2415 |
| Datensatznummer |
250116888
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| Publikation (Nr.) |
 copernicus.org/tc-9-2405-2015.pdf |
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| Zusammenfassung |
| 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-latitudes to high latitudes of
the Southern Hemisphere (SH), which over the last few decades have
experienced extreme and regionally 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 δD – a
proxy for temperature – from the geographic South Pole where we find a
significant influence from extratropical pressure anomalies which act as
"gatekeepers" to the meridional exchange of air masses. Reanalysis of global
atmospheric circulation suggests these pressure anomalies play a significant
influence on mid- to high-latitude SH climate, modulated by the tropical
Pacific Ocean. This work adds to a growing body of literature confirming the
important roles of tropical and mid-latitude atmospheric circulation
variability on Antarctic temperatures. Our findings suggest that future
increasing tropical warmth will strengthen meridional circulation,
exaggerating current trends, with potentially significant impacts on
Antarctic surface mass balance. |
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