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Geology; March 2009; v. 37; no. 3; p. 195-198; DOI: 10.1130/G25363A.1
© 2009 Geological Society of America
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Southern Ocean evidence for reduced export of North Atlantic Deep Water during Heinrich event 1

Laura F. Robinson1 and Tina van de Flierdt2,*

1Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
2Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, New York 10964, USA


Figure 01
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  		Figure 1. Map of Drake Passage. Subantarctic and Polar Fronts shown in white marking the main flow of the Antarctic Circumpolar Current (Orsi et al., 1995). Arrows showing Pacific Deep Water (PDW) and North Atlantic Deep Water (NADW) are schematic, and do not represent true path. Yellow squares show locations of water column profiles in which neodymium isotopes have been measured (Piepgras and Wasserburg, 1982); asterisk indicates site shown in Figure 2. Red dots show locations of corals.

 

Figure 02
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  		Figure 2. Drake Passage depth profiles. A: Black diamonds show {epsilon}Nd of seawater in Drake Passage (Piepgras and Wasserburg, 1982). Blue triangle is {epsilon}Nd of the modern coral. Red triangle is {epsilon}Nd of the H1 coral. Black triangle is {epsilon}Nd of flakes of ferromanganese crust scraped off surface of the H1 coral. B: Top radio-carbon scale is for the modern, and the lower for H1. Scales have been offset so that modern and H1 atmospheres (shown by blue line) are aligned, allowing direct comparison of atmosphere-water column difference. The H1 atmosphere of 410{per thousand} is average of Cariaco Basin {Delta}14C values from 17 to 16.4 ka based on the Hulu time scale (Hughen et al. 2006). Black diamonds are GEOSECS (Geochemical Ocean Section Study) water column {Delta}14C (Stuiver and Ostlund, 1980). Red triangles are H1-aged corals from Drake Passage: filled are from this study, and open are from Goldstein et al. (2001). Arrows are schematic and highlight that the H1 offset was larger than that of modern day.

 

Figure 03
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  		Figure 3. Time series records of deglaciation. Upper panel: shown in blue is the {delta}18O of Greenland ice core GISP (Greenland Ice Sheet Project) 2 (Grootes et al., 1993) with Younger Dryas (YD), Heinrich event 1 (H1), and Last Glacial Maximum (LGM). Lower panel: green time series is 231Pa/230Th ratio measured in 4500-m-deep sediment core from Bermuda Rise (McManus et al., 2004). Red triangles are {epsilon}Nd values of two deep-sea corals analyzed in this study. Scaling is set so that modern Drake Passage {epsilon}Nd and North Atlantic Pa/Th plot together, and the highest Pa/Th values at H1 are aligned with the {epsilon}Nd value in the Drake Passage that we would expect if there was no input of Nd from the Atlantic (i.e., –4 {epsilon} units).

 




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