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| Main Authors: | , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2015
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| Online Access: | https://doi.org/10.1594/PANGAEA.855830 |
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| _version_ | 1867171837845176320 |
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| author | Ma, Zhongwu Ravelo, Ana Christina Liu, Zhonghui Zhou, Liping Paytan, Adina |
| author_facet | Ma, Zhongwu Ravelo, Ana Christina Liu, Zhonghui Zhou, Liping Paytan, Adina |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Export production is an important component of the carbon cycle, modulating the climate system by transferring CO2 from the atmosphere to the deep ocean via the biological pump. Here we use barite accumulation rates to reconstruct export production in the eastern equatorial Pacific over the past 4.3 Ma. We find that export production fluctuated considerably on multiple time scales. Export production was on average higher (51 g C/m**2/yr) during the Pliocene than the Pleistocene (40 g C/m**2/yr), decreasing between 3 and 1 Ma (from more than 60 to 20 g C/m**2/yr) followed by an increase over the last million years. These trends likely reflect basin-scale changes in nutrient inventory and ocean circulation. Our record reveals decoupling between export production and temperatures on these long (million years) time scale. On orbital time scales, export production was generally higher during cold periods (glacial maxima) between 4.3 and 1.1 Ma. This could be due to stronger wind stress and higher upwelling rates during glacial periods. A shift in the timing of maximum export production to deglaciations is seen in the last ~1.1 million years. Results from this study suggest that, in the eastern equatorial Pacific, mechanisms that affect nutrient supply and/or ecosystem structure and in turn carbon export on orbital time scales differ from those operating on longer time scales and that processes linking export production and climate-modulated oceanic conditions changed about 1.1 million years ago. These observations should be accounted for in climate models to ensure better predictions of future climate change. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_855830 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Barite accumulation rates throughout Pliocene-Pleistocene in Eastern Equatorial Pacific at ODP Site 138-849 Ma, Zhongwu Ravelo, Ana Christina Liu, Zhonghui Zhou, Liping Paytan, Adina 138-849; Accumulation rate, barite; Accumulation rate, calcium carbonate; Accumulation rate, mass; AGE; Barite; Calcium carbonate; COMPCORE; Composite Core; Density, dry bulk; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Export production; Joides Resolution; Leg138; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Sedimentation rate Export production is an important component of the carbon cycle, modulating the climate system by transferring CO2 from the atmosphere to the deep ocean via the biological pump. Here we use barite accumulation rates to reconstruct export production in the eastern equatorial Pacific over the past 4.3 Ma. We find that export production fluctuated considerably on multiple time scales. Export production was on average higher (51 g C/m**2/yr) during the Pliocene than the Pleistocene (40 g C/m**2/yr), decreasing between 3 and 1 Ma (from more than 60 to 20 g C/m**2/yr) followed by an increase over the last million years. These trends likely reflect basin-scale changes in nutrient inventory and ocean circulation. Our record reveals decoupling between export production and temperatures on these long (million years) time scale. On orbital time scales, export production was generally higher during cold periods (glacial maxima) between 4.3 and 1.1 Ma. This could be due to stronger wind stress and higher upwelling rates during glacial periods. A shift in the timing of maximum export production to deglaciations is seen in the last ~1.1 million years. Results from this study suggest that, in the eastern equatorial Pacific, mechanisms that affect nutrient supply and/or ecosystem structure and in turn carbon export on orbital time scales differ from those operating on longer time scales and that processes linking export production and climate-modulated oceanic conditions changed about 1.1 million years ago. These observations should be accounted for in climate models to ensure better predictions of future climate change. |
| title | Barite accumulation rates throughout Pliocene-Pleistocene in Eastern Equatorial Pacific at ODP Site 138-849 |
| topic | 138-849; Accumulation rate, barite; Accumulation rate, calcium carbonate; Accumulation rate, mass; AGE; Barite; Calcium carbonate; COMPCORE; Composite Core; Density, dry bulk; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Export production; Joides Resolution; Leg138; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Sedimentation rate |
| url | https://doi.org/10.1594/PANGAEA.855830 |