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• Main Authors: N. J. Shackleton, M. A. Hall, J. Line, C. Shuxi, N. R. Andersen, A. Malahoff
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Prell; K. C. Emeis; Eds. (Geological Society; London; Southern Ocean
• 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

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.