Journal
GEOLOGY
Volume 35, Issue 8, Pages 675-678Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G23831A.1
Keywords
Mediterranean Sea; thermohaline circulation; sapropels; stable isotopes; biomarkers
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The eastern Mediterranean is undergoing a long-term increase in net evaporation, which may have preconditioned the profound changes that occurred in its deep-sea ventilation over the past two decades. We test the sensitivity of Aegean convective deep-water formation to forcing in the opposite sense, based on a last interglacial episode of enhanced freshwater injection into the eastern Mediterranean. We find that Aegean subsurface ventilation collapsed completely within 40 +/- 20 yr, promoting euxinic conditions hostile to aerobic life that expanded toward the photic layer within 650 +/- 250 yr. Similar conditions extended throughout the eastern Mediterranean 300 +/- 120 yr later. These findings emphasize the exceptional sensitivity of Aegean deep-water formation to climate forcing, driving large-scale hydrographic adjustments throughout the eastern Mediterranean and beyond.
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