Abrupt millennial-scale changes in intensity of Southern Hemisphere westerly winds during marine isotope stages 2–4

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dc.contributor.authorWhittaker, Thomas Edward
dc.contributor.authorHendy, Chris H.
dc.contributor.authorHellstrom, John C.
dc.date.accessioned2011-05-25T04:57:17Z
dc.date.available2011-05-25T04:57:17Z
dc.date.issued2011
dc.description.abstractThe strength of mid-southern latitude westerly atmospheric circulation plays an important role in global climate. Due to a lack of long, continuous, high-resolution paleoclimate archives from mid-southern latitudes, it remains unclear what factors control changes in its intensity and how past changes affected the climates of landmasses in their path. Here we show growth rate and stable isotope (18O, 13C) profiles from a South Island, New Zealand, stalagmite (HW3) that permit centennial-scale investigation of Southern Hemisphere westerly paleointensity between 73 and 11 ka. Correlation between HW3 growth rate and isotope profiles suggests sensitivity to changes in annual precipitation, a factor controlled by westerly intensity. Low growth rates and relatively enriched isotope ratios define long-term trends in HW3, supporting existing evidence that weaker westerlies predominated during the last glacial period. Abrupt millennial-scale events occur frequently, such that the HW3 record resembles Greenland ice core stable isotope profiles. Furthermore, nearly synchronous timing of nine prominent wet and cool intervals with Heinrich events supports studies showing that increased westerly intensity is closely linked to North Atlantic cooling. As well as Heinrich events, the HW3 profiles also show an Antarctic Cold Reversal–like event during deglaciation, advocating for a bipolar seesaw of global climate at that time.en_NZ
dc.identifier.citationWhittaker, T.E., Hendy, C.H. & Hellstrom, J.C. (2011). Abrupt millennial-scale changes in intensity of Southern Hemisphere westerly winds during marine isotope stages 2–4. Geology, 39(5), 455-458.en_NZ
dc.identifier.doi10.1130/G31827.1en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5358
dc.language.isoen
dc.publisherGeological Society of Americaen_NZ
dc.relation.isPartOfGeologyen_NZ
dc.relation.urihttp://geology.geoscienceworld.org/cgi/content/abstract/39/5/455en_NZ
dc.subjectchemistryen_NZ
dc.titleAbrupt millennial-scale changes in intensity of Southern Hemisphere westerly winds during marine isotope stages 2–4en_NZ
dc.typeJournal Articleen_NZ
pubs.begin-page455en_NZ
pubs.elements-id35952
pubs.end-page458en_NZ
pubs.issue5en_NZ
pubs.volume39en_NZ
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