Paleoceanographic reconstructions from planktonic foraminifera off the Iberian Margin: Temperature, salinity, and Heinrich events
A quantitative analysis of planktonic foraminifera in a core from the Iberian Margin allows a reconstruction of the evolution of oceanographic parameters during the last glacial cycle with a resolution of similar to 1000 years. A principal component analysis performed on 19 species allows the identi...
| Published in: | Paleoceanography |
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| Main Authors: | , , , |
| Format: | Text |
| Language: | English |
| Published: |
Amer Geophysical Union
1999
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| Subjects: | |
| Online Access: | https://doi.org/10.1029/1998PA900027 https://archimer.ifremer.fr/doc/00239/35062/34594.pdf https://archimer.ifremer.fr/doc/00239/35062/ |
| Summary: | A quantitative analysis of planktonic foraminifera in a core from the Iberian Margin allows a reconstruction of the evolution of oceanographic parameters during the last glacial cycle with a resolution of similar to 1000 years. A principal component analysis performed on 19 species allows the identification of 11 intervals characterized by increased abundances of the subpolar species. The youngest six of these intervals are correlated with the last 6 Heinrich events (HEs). The five cold events older than stage 4 are dated at 81, 90, 110, 129, and 140 ka, respectively. Paleotemperatures reconstructed using the modern analog technique indicate 4 degrees C decreases during all even-numbered isotopic stages and stage 3. During the HEs, temperature decreases reach similar to 10 degrees C and seawater delta(18)O anomalies reach similar to 1 parts per thousand. Temperature and salinity reconstructions indicate that the environment of the Iberian Margin has been under the combined influence of global factors such as the migration of the polar front and iceberg discharge and of regional factors such as the precipitation/evaporation regime on both oceanic and continental area. |
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