Academic Journal
Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years
| العنوان: | Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years |
|---|---|
| المؤلفون: | Weber, ME, Bailey, I, Hemming, SR, Martos, YM, Reilly, BT, Ronge, TA, Brachfeld, S, Williams, T, Raymo, M, Belt, ST, Smik, L, Vogel, H, Peck, VL, Linda Armbrecht, Cage, A, Cardillo, FG, Du, Z, Fauth, G, Fogwill, CJ, Garcia, M, Garnsworthy, M, Gluder, A, Guitard, M, Gutjahr, M, Hernandez-Almeida, I, Hoem, FS, Hwang, JH, Iizuka, M, Kato, Y, Kenlee, B, OConnell, S, Perez, LF, Seki, O, Stevens, L, Tauxe, L, Tripathi, S, Warnock, J, Zheng, X |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Marine geoscience, Biological oceanography, Palaeoclimatology, Antarctica, productivity, dust, Southern Ocean, Mid-Pleistocene Transition, diatoms, silica |
| الوصف: | The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages and their role in influencing the carbon cycle. We report a high-resolution record of dust deposition and ocean productivity for the Antarctic Zone, close to the main dust source, Patagonia. Our deep-ocean records cover the last 1.5 Ma, thus doubling that from Antarctic ice-cores. We find a 5 to 15-fold increase in dust deposition during glacials and a 2 to 5-fold increase in biogenic silica deposition, reflecting higher ocean productivity during interglacials. This antiphasing persisted throughout the last 25 glacial cycles. Dust deposition became more pronounced across the Mid-Pleistocene Transition (MPT) in the Southern Hemisphere, with an abrupt shift suggesting more severe glaciations since ~0.9 Ma. Productivity was intermediate pre-MPT, lowest during the MPT and highest since 0.4 Ma. Generally, glacials experienced extended sea-ice cover, reduced bottom-water export and Weddell Gyre dynamics, which helped lower atmospheric CO 2 levels. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| Relation: | 102.100.100/550470; https://figshare.com/articles/journal_contribution/Antiphased_dust_deposition_and_productivity_in_the_Antarctic_Zone_over_1_5_million_years/23007170 |
| الاتاحة: | https://figshare.com/articles/journal_contribution/Antiphased_dust_deposition_and_productivity_in_the_Antarctic_Zone_over_1_5_million_years/23007170 |
| Rights: | In Copyright |
| رقم الانضمام: | edsbas.51420AAA |
| قاعدة البيانات: | BASE |
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