English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Journal Article

The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle

MPS-Authors
/persons/resource/persons192213

Martinez-Garcia,  Alfredo
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons187781

Haug,  Gerald H.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Hasenfratz, A. P., Jaccard, S. L., Martinez-Garcia, A., Sigman, D. M., Hodell, D. A., Vance, D., et al. (2019). The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle. Science, 363(6431), 1080-1084. doi:10.1126/science.aat7067.


Cite as: https://hdl.handle.net/21.11116/0000-0003-AC32-3
Abstract
From 1.25 million to 700,000 years ago, the ice age cycle deepened and lengthened from 41,000- to 100,000-year periodicity, a transition that remains unexplained. Using surface- and bottom-dwelling foraminifera from the Antarctic Zone of the Southern Ocean to reconstruct the deep-to-surface supply of water during the ice ages of the past 1.5 million years, we found that a reduction in deep water supply and a concomitant freshening of the surface ocean coincided with the emergence of the high-amplitude 100,000-year glacial cycle. We propose that this slowing of deep-to-surface circulation (i.e., a longer residence time for Antarctic surface waters) prolonged ice ages by allowing the Antarctic halocline to strengthen, which increased the resistance of the Antarctic upper water column to orbitally paced drivers of carbon dioxide release.