Tectonic reconstructions for paleobathymetry in Drake Passage
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The age and origin of the central Scotia Sea
S U M M A R Y Opening of the Drake Passage gateway between the Pacific and Atlantic oceans has been linked in various ways to Cenozoic climate changes. From the oceanic floor of Drake Passage, the largest of the remaining uncertainties in understanding this opening is in the timing and process of the opening of the central Scotia Sea. All but one of the available constraints on the age of the c...
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[1] A total of 232 samples were analyzed for concentrations of dissolved aluminum ([Al]) and manganese ([Mn]) in Drake Passage. Both [Al] and [Mn] were extremely low ( 0.3 and 0.1 nM, respectively) in the surface layer of the middle Drake Passage, most likely due to limited input and biological uptake/scavenging. Elevated [Al] (>14 nM) and [Mn] (>2 nM) over the South American continental shelf ...
متن کاملEffect of Ocean Gateway Changes under Greenhouse Warmth
The role of tectonic Southern Ocean gateway changes in driving Antarctic climate change at the Eocene– Oligocene boundary remains a topic of debate. One approach taken in previous idealized modeling studies of gateway effects has been to alter modern boundary conditions, whereby the Drake Passage becomes closed. Here, the authors follow this approach but vary atmospheric pCO2 over a range of va...
متن کاملSeasonal to interannual upper-ocean variability in the Drake Passage
Year-round monitoring of the upper-ocean temperature variability in Drake Passage has been undertakensince September 1996 through repeat expendablebathythermograph(XBT) surveys. The closely spaced measurements (6–15 km apart) provide the rst multi-year time series for examining seasonal to interannual variability in this Southern Ocean choke point. While the temperature sections reveal the se...
متن کاملTiming and climatic consequences of the opening of Drake Passage.
Age estimates for the opening of Drake Passage range from 49 to 17 million years ago (Ma), complicating interpretations of the relationship between ocean circulation and global cooling. Secular variations of neodymium isotope ratios at Agulhas Ridge (Southern Ocean, Atlantic sector) suggest an influx of shallow Pacific seawater approximately 41 Ma. The timing of this connection and the subseque...
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تاریخ انتشار 2014