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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2001
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| Online Access: | https://doi.org/10.1594/PANGAEA.89557 |
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| _version_ | 1867169539421110272 |
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| author | Moreno, Ana |
| author_facet | Moreno, Ana |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Canary Basin lies in a region of strong interaction between the atmospheric and ocean circulation systems: Trade winds drive seasonal coastal upwelling and dust storm outbreaks from the neighbouring Sahara desert are the major source of terrigenous sediment. To investigate the forcing mechanisms for dust input and wind strength in the North Canary Basin, the temporal pattern of variability of sedimentological and geochemical proxy records has been analysed in two sediment cores between latitudes 30°30'N and 31°40'N. Spectral analysis of the dust proxy records indicates that insolation changes related to eccentricity and precession are the main periods of temporal variation in the record. Si/Al and grain-size of the terrigenous fraction show an increase in glacial-interglacial transitions while Al concentration and Fe/Al ratio are both in phase with minima in the precessional index. Hence, the results obtained show that the wind strength was intensified at Terminations. At times of maxima of Northern Hemisphere seasonal insolation, when the African monsoon was enhanced, the North Canary Basin also received higher dust input. This result suggests that the moisture brought by the monsoon may have increased the availability of dust in the source region. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_89557 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 2) Age model and sedimentation rate of sediment core GeoB5559-2 Moreno, Ana Age model; Age model, SPECMAP chronology, Imbrie et al. (1984); DEPTH, sediment/rock; GeoB; GeoB5559-2; Geosciences, University of Bremen; Gravity corer (Kiel type); Isotopic event; M42/4b; Meteor (1986); Sedimentation rate; SL The Canary Basin lies in a region of strong interaction between the atmospheric and ocean circulation systems: Trade winds drive seasonal coastal upwelling and dust storm outbreaks from the neighbouring Sahara desert are the major source of terrigenous sediment. To investigate the forcing mechanisms for dust input and wind strength in the North Canary Basin, the temporal pattern of variability of sedimentological and geochemical proxy records has been analysed in two sediment cores between latitudes 30°30'N and 31°40'N. Spectral analysis of the dust proxy records indicates that insolation changes related to eccentricity and precession are the main periods of temporal variation in the record. Si/Al and grain-size of the terrigenous fraction show an increase in glacial-interglacial transitions while Al concentration and Fe/Al ratio are both in phase with minima in the precessional index. Hence, the results obtained show that the wind strength was intensified at Terminations. At times of maxima of Northern Hemisphere seasonal insolation, when the African monsoon was enhanced, the North Canary Basin also received higher dust input. This result suggests that the moisture brought by the monsoon may have increased the availability of dust in the source region. |
| title | (Table 2) Age model and sedimentation rate of sediment core GeoB5559-2 |
| topic | Age model; Age model, SPECMAP chronology, Imbrie et al. (1984); DEPTH, sediment/rock; GeoB; GeoB5559-2; Geosciences, University of Bremen; Gravity corer (Kiel type); Isotopic event; M42/4b; Meteor (1986); Sedimentation rate; SL |
| url | https://doi.org/10.1594/PANGAEA.89557 |