Earth Institute Contact: Dr. Robert Anderson
Locations: Southern Ocean
This project is funded to confirm the "Silicic Acid Leakage Hypothesis" which is that silicic acid is less efficiently utilized in the southern ocean during glacial periods and transported, via intermediate waters, to the equatorial upwelling regions to support higher opal productivity, resulting in a lower carbonate/Corg rain ratio and an increase in ocean alkalinity.
A complete assessment of the Silicic acid leakage hypothesis will require an evaluation of:
(1) Si utilization efficiencies using newly-developed stable isotopic techniques;
(2) opal burial rates in low-latitude upwelling regions; and
(3) opal burial rates in the Southern Ocean.
The PIs propose to confirm the hypothesis by examining changes in opal accumulation rates in the equatorial regions between the last glacial and the Holocene.
Cross Cutting Themes:
National Science Foundation