Barium concentration in sediments of the central Equatorial Pacific
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1996
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| _version_ | 1867170457407455232 |
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| author | Paytan, Adina Kaster, M |
| author_facet | Paytan, Adina Kaster, M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | High resolution pore-water dissolved Ba concentration-depth profiles were determined at seven sites across an Equatorial Pacific productivity gradient from 12°S to 9°N, at 140°W. These data are important for understanding the physical, chemical, and biological controls on Ba recycling in the ocean, and for evaluating the paleo-oceanographic significance of Ba content in central Equatorial Pacific sediments. Pore-water Ba concentrations at all sites are higher than in the overlying bottom water, leading to a diffusive flux of Ba into the ocean. A pronounced subsurface concentration maximum exceeding barite solubility characterizes the dissolved Ba pore-water profiles, suggesting that the Ba regenerated in the upper few millimeters of sediment is not controlled by barite solubility. A few centimeters down-core Ba concentrations reach a relatively constant value of approximately barite saturation. The benthic Ba flux shows a clear zonal trend, with a maximum between 2°S and 2°N, most probably due to higher productivity at the equatorial divergence zone, and with lowest values at the southern and northern extremes of the transect. The dissolved Ba flux between 2°S and 2°N is ~30 nmol/cm**2 yr and drops to 6 nmol/cm**2 yr at 12°S. Even the lowest fluxes are significantly higher than those previously reported for the open ocean. In the Equatorial Pacific the calculated Ba recycling efficiency is about 70%. Thus, ~30% of the particulate Ba flux to the deep ocean is preserved in the sediments, compared with less than 1% for organic carbon and ~5% for biogenic silica. Mass balance calculation of the oceanic Ba cycle, using a two-box model, implies benthic Ba fluxes similar to those reported here for a steady-state ocean. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_736799 |
| institution | PANGAEA |
| language | en |
| publishDate | 1996 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Barium concentration in sediments of the central Equatorial Pacific Paytan, Adina Kaster, M Equatorial Pacific; GC; Gravity corer; JGOFS; Joint Global Ocean Flux Study; Thomas G. Thompson; TT013; TT013_12S_A; TT013_12S_B; TT013_2N_A; TT013_2N_B; TT013_2S_A; TT013_2S_B; TT013_5N_A; TT013_5N_B; TT013_5S_A; TT013_5S_B; TT013_9N_A; TT013_9N_B; TT013_EQ_A; TT013_EQ_B High resolution pore-water dissolved Ba concentration-depth profiles were determined at seven sites across an Equatorial Pacific productivity gradient from 12°S to 9°N, at 140°W. These data are important for understanding the physical, chemical, and biological controls on Ba recycling in the ocean, and for evaluating the paleo-oceanographic significance of Ba content in central Equatorial Pacific sediments. Pore-water Ba concentrations at all sites are higher than in the overlying bottom water, leading to a diffusive flux of Ba into the ocean. A pronounced subsurface concentration maximum exceeding barite solubility characterizes the dissolved Ba pore-water profiles, suggesting that the Ba regenerated in the upper few millimeters of sediment is not controlled by barite solubility. A few centimeters down-core Ba concentrations reach a relatively constant value of approximately barite saturation. The benthic Ba flux shows a clear zonal trend, with a maximum between 2°S and 2°N, most probably due to higher productivity at the equatorial divergence zone, and with lowest values at the southern and northern extremes of the transect. The dissolved Ba flux between 2°S and 2°N is ~30 nmol/cm**2 yr and drops to 6 nmol/cm**2 yr at 12°S. Even the lowest fluxes are significantly higher than those previously reported for the open ocean. In the Equatorial Pacific the calculated Ba recycling efficiency is about 70%. Thus, ~30% of the particulate Ba flux to the deep ocean is preserved in the sediments, compared with less than 1% for organic carbon and ~5% for biogenic silica. Mass balance calculation of the oceanic Ba cycle, using a two-box model, implies benthic Ba fluxes similar to those reported here for a steady-state ocean. |
| title | Barium concentration in sediments of the central Equatorial Pacific |
| topic | Equatorial Pacific; GC; Gravity corer; JGOFS; Joint Global Ocean Flux Study; Thomas G. Thompson; TT013; TT013_12S_A; TT013_12S_B; TT013_2N_A; TT013_2N_B; TT013_2S_A; TT013_2S_B; TT013_5N_A; TT013_5N_B; TT013_5S_A; TT013_5S_B; TT013_9N_A; TT013_9N_B; TT013_EQ_A; TT013_EQ_B |
| url | https://doi.org/10.1594/PANGAEA.736799 |