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controlling past variations of atmospheric CO2, which in turn amplified climate forcings to yield the large observed amplitude of ice age cycles (e.g. Broecker,1982; Sigman and Boyle, 2000). Abyssal water is ventilated on a multi-centennial to millennial timescale, so that a change in atmospheric CO...
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| Format: | Text |
| Language: | English |
| Published: |
2009
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.611.3074 http://www.climategeology.ethz.ch/publications/2010_Jaccard_et_al.pdf |
| Summary: | controlling past variations of atmospheric CO2, which in turn amplified climate forcings to yield the large observed amplitude of ice age cycles (e.g. Broecker,1982; Sigman and Boyle, 2000). Abyssal water is ventilated on a multi-centennial to millennial timescale, so that a change in atmospheric CO2 driven by factors other than oceanic processes would be dampened. In addition, over thousands plankton completely exhaust roughly 2/3 of global ocean surface waters of available nutrients on a seasonal basis (Conkright et al., 2002). In tropical and subtropical regions of the world ocean, a large fraction of the nutrient resupply to the euphotic zone occurs via Subantarctic Mode Water, which spreads throughout the entire Southern Hemisphere and North Atlantic Ocean (e.g. Sarmiento et al., 2004, 2007). The fact that nutrients are completely consumed throughout the low-latitude surface ocean means that the biolog-ical pump is at maximum efficiency there. |
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