Sea surface temperatures of southern midlatitudes 0–160 kyr B.P.
Article first published online: 13 APR 2006
Copyright 2006 by the American Geophysical Union.
Volume 21, Issue 2, June 2006
How to Cite
2006), Sea surface temperatures of southern midlatitudes 0–160 kyr B.P. Paleoceanography, 21, PA2003, doi:10.1029/2005PA001191., and (
- Issue published online: 13 APR 2006
- Article first published online: 13 APR 2006
- Manuscript Accepted: 11 JAN 2006
- Manuscript Revised: 7 NOV 2005
- Manuscript Received: 4 JUL 2005
- sea surface temperature;
- midsouthern latitudes
 Late Quaternary climate fluctuated between extremes of glaciations, lasting ∼90 kyr on average, and interglacial episodes, lasting ∼10 kyr. Still largely unknown are the spatial and temporal evolution of these global climate states, with vigorous debate still underway on the mechanisms responsible for glacial inceptions and terminations. Though it is widely believed that the Southern Hemisphere oceans play a central role in global climate changes, few paleoclimate records exist from there. Here we present three new alkenone-derived SST records from the midlatitude Southern Hemisphere spanning the last 160 kyr, a full glacial-interglacial cycle. Our subtropical SST records from the last glacial period are characterized by (1) warming 47–23 kyr B.P., when high latitudes in both hemispheres cooled, and (2) milder temperatures during the penultimate glacial period than during the last glacial interval. These SST features are found to be of tropical- to subtropical-wide extent, implying increased thermal gradients at times of high-latitude ice sheet growth. This has implications for the vigor of atmospheric and upper ocean circulation and the transport of heat and moisture to the poles that may have been instrumental in the growth and maintenance of polar ice sheets during glacial periods.