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- Title
Tropical forcing of increased Southern Ocean climate variability revealed by a 140-year subantarctic temperate reconstruction.
- Authors
Turney, Chris S. M.; Fogwill, Christopher J.; Palmer, Jonathan G.; Sebille, Erik van; Thomas, Zoë; McGlone, Matt; Richardson, Sarah; Wilmshurst, Janet M.; Fenwick, Pavla; Zunz, Violette; Goosse, Hugues; Wilson, Kerry-Jayne; Carter, Lionel; Lipson, Mathew; Jones, Richard T.; Harsch, Melanie; Clark, Graeme; Marzinelli, Ezequiel; Rogers, Tracey; Rainsley, Eleanor
- Abstract
Occupying 14% of the world's surface, the Southern Ocean plays a fundamental role in global climate, ocean circulation, carbon cycling and Antarctic ice-sheet stability. Unfortunately, high interannual variability and a dearth of instrumental observations before the 1950s limits our understanding of how marine-atmosphere-ice domains interact on multi-decadal timescales and the impact of anthropogenic forcing. Here we integrate climate-sensitive tree growth with ocean and atmospheric observations on southwest Pacific subantarctic islands that lie at the boundary of polar and subtropical climates (52-54˚S). Our annually-resolved temperature reconstruction captures regional change since the 1870s and demonstrates a significant increase in variability from the mid-twentieth century, a phenomenon predating the observational record. Climate reanalysis and modelling shows a parallel change in tropical Pacific sea surface temperatures that generate an atmospheric Rossby wave train which propagates across a large part of the Southern Hemisphere during the austral spring and summer.
- Subjects
ANTARCTIC Ocean; SUBANTARCTIC region; OCEAN circulation; CARBON cycle; ICE sheets; MARINE ecology
- Publication
Climate of the Past Discussions, 2016, p1
- ISSN
1814-9324
- Publication type
Article
- DOI
10.5194/cp-2016-114