Southern hemisphere water mass conversion linked with North Atlantic climate variability

Publication Type  Journal Article
Year of Publication  2005
Authors  Pahnke, K.; Zahn, R.
Journal Title  Science
Volume  307
Issue  5716
Pages  1741-1746
Journal Date  Mar 18
ISBN Number  0036-8075
Accession Number  ISI:000227883900036
Key Words  last glacial maximum; antarctic mode water; vostok ice core; thermohaline circulation; intermediate water; ocean circulation; sea-level; labrador sea; time scales; deep-water

Intermediate water variability at multicentennial scales is documented by 340,000-year-long isotope time series from bottom-dwelling foraminifers at a mid-depth core site in the southwest Pacific. Periods of sudden increases in intermediate water production are linked with transient Southern Hemisphere warm episodes, which implies direct control of climate warming on intermediate water conversion at high southern latitudes. Coincidence with episodes of climate cooling and minimum or halted deepwater convection in the North Atlantic provides striking evidence for interdependence of water mass conversion in both hemispheres, with implications for interhemispheric forcing of ocean thermohaline circulation and climate instability.


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URL  <Go to ISI>://000227883900036
DOI  DOI 10.1126/science.1102163