Stable isotope ratios of epibenthic foraminifer Cibicidoides wuellerstorfi from sediment profile GeoB9526
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2011
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| _version_ | 1867168095797248000 |
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| author | Zarriess, Michelle Mackensen, Andreas |
| author_facet | Zarriess, Michelle Mackensen, Andreas |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Studies of temporal changes of ocean circulation and deep-water ventilation often rely on d13C records of epibenthic foraminifer Cibicidoides wuellerstorfi. However, primary productivity related overprints may distort the signal and simulate a chemical age of ambient water mass that is too old and simulates poorly ventilated ambient bottom waters. To further constrain the use of C. wuellerstorfi d13C records from high-productivity areas, we analyzed a 14CAMS-dated gravity core from the upwelling regime off northwest Africa at 12°N. We compare this new record with 37 radiocarbon dated d13C records from the eastern Atlantic Ocean between 45°N and 25°S that are bathed by the same water mass. Only during Heinrich events 1 and 2, when the investigated core site off northwest Africa experienced year-round, sustained deposition of organic matter, the d13C values at this site faithfully record deep-water ventilation states. During times of predominantly seasonal deposition of fresh phytodetritus, however, d13C values were significantly lower than at the reference sites. This underscores that reconstruction of paleocirculation and deep ocean ventilation using C. wuellerstorfi d13C from regions that experienced seasonal phytodetritus deposition needs to be validated by additional proxies that are not affected by local productivity. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_756414 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotope ratios of epibenthic foraminifer Cibicidoides wuellerstorfi from sediment profile GeoB9526 Zarriess, Michelle Mackensen, Andreas 311; AGE; AWI_Paleo; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; Depth, composite; DEPTH, sediment/rock; Event label; GeoB9526-4; GeoB9526-5; Gravity corer (Kiel type); M65/1; Mass spectrometer Finnigan MAT 251; Meteor (1986); MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; SL Studies of temporal changes of ocean circulation and deep-water ventilation often rely on d13C records of epibenthic foraminifer Cibicidoides wuellerstorfi. However, primary productivity related overprints may distort the signal and simulate a chemical age of ambient water mass that is too old and simulates poorly ventilated ambient bottom waters. To further constrain the use of C. wuellerstorfi d13C records from high-productivity areas, we analyzed a 14CAMS-dated gravity core from the upwelling regime off northwest Africa at 12°N. We compare this new record with 37 radiocarbon dated d13C records from the eastern Atlantic Ocean between 45°N and 25°S that are bathed by the same water mass. Only during Heinrich events 1 and 2, when the investigated core site off northwest Africa experienced year-round, sustained deposition of organic matter, the d13C values at this site faithfully record deep-water ventilation states. During times of predominantly seasonal deposition of fresh phytodetritus, however, d13C values were significantly lower than at the reference sites. This underscores that reconstruction of paleocirculation and deep ocean ventilation using C. wuellerstorfi d13C from regions that experienced seasonal phytodetritus deposition needs to be validated by additional proxies that are not affected by local productivity. |
| title | Stable isotope ratios of epibenthic foraminifer Cibicidoides wuellerstorfi from sediment profile GeoB9526 |
| topic | 311; AGE; AWI_Paleo; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; Depth, composite; DEPTH, sediment/rock; Event label; GeoB9526-4; GeoB9526-5; Gravity corer (Kiel type); M65/1; Mass spectrometer Finnigan MAT 251; Meteor (1986); MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; SL |
| url | https://doi.org/10.1594/PANGAEA.756414 |