Sedimentation rate and UK37 on Site 108-658
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| Auteurs principaux: | , , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1992
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| _version_ | 1867169979732852736 |
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| author | Eglinton, Geoffrey Bradshaw, S Resell, A Sarnthein, Michael Pflaumann, Uwe Tiedemann, Ralf |
| author_facet | Eglinton, Geoffrey Bradshaw, S Resell, A Sarnthein, Michael Pflaumann, Uwe Tiedemann, Ralf |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | High-resolution palaeoclimate records based on oxygen isotope data have provided important insights into climate variability and rates of natural climate change on about a thousand-year timescale. Little is known, however, about the variation of climate and of palaeoceanographic conditions throughout the Quaternary on timescales of less than 1,000 years (at frequencies far greater than those of the Milankovitch orbital cycles). Here we show that such high time resolution is possible from molecular stratigraphic studies based on 'biomarker' organic molecules (alkenones). We have sampled alkenone stratigraphic records at 70- to 200-yr intervals across glacial terminations I, II and IV in sediment cores from OOP site 658, off northwest Africa. Sea surface temperatures (SSTs) derived from the alkenone (Uk 37) index vary rapidly beyond the range of analytical noise by up to 2.5 °C in 300 yr, showing hitherto unknown cycles with about 600-yr periodicities. Some of the changes parallel similar events in the oxygen isotope stratigraphy. SST oscillations may be linked, in part, to abrupt breakdowns in Atlantic deep-water ventilation resulting from meltwater events of Quaternary glacial terminations. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_757318 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sedimentation rate and UK37 on Site 108-658 Eglinton, Geoffrey Bradshaw, S Resell, A Sarnthein, Michael Pflaumann, Uwe Tiedemann, Ralf 108-658; AGE; Alkenone, unsaturation index UK37; Canarias Sea; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg108; Ocean Drilling Program; ODP; Sedimentation rate High-resolution palaeoclimate records based on oxygen isotope data have provided important insights into climate variability and rates of natural climate change on about a thousand-year timescale. Little is known, however, about the variation of climate and of palaeoceanographic conditions throughout the Quaternary on timescales of less than 1,000 years (at frequencies far greater than those of the Milankovitch orbital cycles). Here we show that such high time resolution is possible from molecular stratigraphic studies based on 'biomarker' organic molecules (alkenones). We have sampled alkenone stratigraphic records at 70- to 200-yr intervals across glacial terminations I, II and IV in sediment cores from OOP site 658, off northwest Africa. Sea surface temperatures (SSTs) derived from the alkenone (Uk 37) index vary rapidly beyond the range of analytical noise by up to 2.5 °C in 300 yr, showing hitherto unknown cycles with about 600-yr periodicities. Some of the changes parallel similar events in the oxygen isotope stratigraphy. SST oscillations may be linked, in part, to abrupt breakdowns in Atlantic deep-water ventilation resulting from meltwater events of Quaternary glacial terminations. |
| title | Sedimentation rate and UK37 on Site 108-658 |
| topic | 108-658; AGE; Alkenone, unsaturation index UK37; Canarias Sea; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg108; Ocean Drilling Program; ODP; Sedimentation rate |
| url | https://doi.org/10.1594/PANGAEA.757318 |