geo 4 - C ar ibbean salinity var iation du ring the last...

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Caribbean salinity variation during the last glacial cycle Schmidt, Matthew Evaporation exceeds precipitation in the tropical Atlantic, resulting in a net freshwater removal from the Atlantic basin. Because most of the North Atlantic’s subtropical gyre water circulates through the Caribbean before flowing to the sub-polar regions of the North Atlantic via the Gulf Stream, changes in tropical atmospheric circulation have the potential to affect the salinity and density structure of the entire north Atlantic, thereby influencing glacial-interglacial (G-I) oscillations in North Atlantic Deep Water (NADW) formation. To reconstruct western tropical Atlantic salinity variations and their influence on NADW formation, we combine Mg/Ca measurements (a proxy for the temperature of calcification) and δ 18 O analyses of shells from the surface-dwelling foraminifera Globigerinoides ruber (white var.) from the western Caribbean Colombian Basin at ODP Site 999A (2827m; 4cm/ka sed. rate) and VM28-122 (3623m; 4-10cm/ka sed. rate) to produce the first
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  • Spring '08
  • Barfod
  • Atlantic Ocean, Atlantic basin, North Atlantic, t ropical Atlantic, glacial Caribbean SSS, ropical Atlantic

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