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C distribution and changed with Milankovich forcing. In addition, the existence of deglacial � 13 C minima in tropical surface water records (2, 3) has been difficult to explain because the nutrient increase implied by the � 13 C shift is not supported by evidence of increased upwelling in these pre...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.219.395 http://www.ks.uiuc.edu/Publications/Papers/PDF/TAJK2002/TAJK2002.pdf |
| Summary: | C distribution and changed with Milankovich forcing. In addition, the existence of deglacial � 13 C minima in tropical surface water records (2, 3) has been difficult to explain because the nutrient increase implied by the � 13 C shift is not supported by evidence of increased upwelling in these presently nutrient-poor regions (2). Because the � 13 C of atmospheric CO 2 was lower at the onset of the deglaciation, tropical surface water � 13 C DIC would have decreased via air-sea equilibration without an accompanying nutrient change. Such a mechanism is analogous to the invasion of low � 13 C anthropogenic CO 2 into the modern surface ocean (7). Taken as a whole, the timing and distribution of the deglacial carbon isotope minimum in tropical marine sediments is consistent with a Southern Ocean origin, with advection through intermediate waters and atmospheric equilibration providing the high-latitude–tropical connection. |
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