Lawrenceetal_FigS1_ODP907.epsPS document1952KSurface conditions at North Atlantic Site 907. A) Biogenic opal % (orange) versus alkenone concentration (ug/g) (black) (this study). B) C37 alkenone MAR (ug/cm2/kyr) (black line) (this study) and IRD (purple line) (note the inverted axis) [Jansen et al., 2000]. Both biogenic opal and alkenone concentration data record the same overall pattern, indicating an early (>3 Ma) decline of productivity at Site 907. As observed at other high latitude localities in the Northern Hemisphere (e.g. site 982, Figure 3), the decline in productivity at site 907 is associated with a dramatic increase in IRD at this locality. Low resolution biogenic opal measurements for site 907 were performed at Brown University using spectrophotometer and the methodology outlined in [Mortlock and Froelich, 1989].
Lawrenceetal_FigS2_ODP662.epsPS document1554KProductivity Records from Equatorial Atlantic Site 662. A) Biogenic opal % [Ruddiman and Janecek, 1989] (light blue) versus C37 alkenone concentration (nmol/g) (this study) (yellow) for the interval from 3 to 1.6 Ma. B) Opal MAR (g/cm2/kyr) [Ruddiman and Janecek, 1989] (light blue) versus C37 alkenone (MAR) (ug/cm2/kyr) this study (yellow). Despite being derived from different groups of organisms and being susceptible to very different diagenetic processes both concentration data and MAR data indicate a tight coupling between variations in biogenic opal and C37 alkenones. These results suggest that both of these indices are proxies for past productivity and that they are recording changes in export productivity at this locality. Interproxy comparisons among different productivity indices from other tropical as well as high latitude localities suggest this conclusion can be broadly generalized [Bolton et al., 2011; Bolton et al., 2010].
Lawrenceetal_FigS3_DSDP607.epsPS document1529KSurface conditions at North Atlantic Site 607. A) Uk’37 sea surface temperature (°C) estimates [Lawrence et al., 2010] (red), and alkenone mass accumulation rates (MAR) (ug/cm2/kyr) (green) (note the inverted axis); B) 41 kyr band phase relationships between SST and productivity (-c37total) at 607. Gray shading identifies the interval of high productivity. SST and productivity proxies are coherent and in phase for most of the high productivity interval in the 41 k band, demonstrating that SST and productivity show tight coupling on orbital timescales with increase in productivity associated with decreases in SST.
Lawrenceetal_FigS4_662alk.epsPS document1310KSurface conditions at North Atlantic Site 662. A) Uk’37 sea surface temperature (°C) estimates [Herbert et al., 2010] (red), and B) alkenone mass accumulation rates (MAR) (ug/cm2/kyr) (green) (this study)(note the inverted axis). Gray shading identifies the interval of high productivity.
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