期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 4, 页码 1238-1246出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059278
关键词
quantitative palaeo Agulhas leakage; planktic foraminiferal; numerical ocean model; overturning circulation
资金
- European Union [243908]
- European Community [238512]
- Australian Research Council [DE130101336]
- ICREA Funding Source: Custom
The Indian-Atlantic water exchange south of Africa (Agulhas leakage) is a key component of the global ocean circulation. No quantitative estimation of the paleo-Agulhas leakage exists. We quantify the variability in interocean exchange over the past 640,000years, using planktic foraminiferal assemblage data from two marine sediment records to define an Agulhas leakage efficiency index. We confirm the validity of our new approach with a numerical ocean model that realistically simulates the modern Agulhas leakage changes. Our results suggest that, during the past several glacial-interglacial cycles, the Agulhas leakage varied by similar to 10sverdrup and more during major climatic transitions. This lends strong credence to the hypothesis that modifications in the leakage played a key role in changing the overturning circulation to full strength mode. Our results are instrumental for validating and quantifying the contribution of the Indian-Atlantic water leakage to the global climate changes. Key Points A quantitative index for the Agulhas leakage has been developed Paleo-Agulhas leakage over the past 640,000 years has been quantified We provide reference points for further analyses and interpretations
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