Project Number: 1850807
The Southern Ocean's Iron Cycle through the Cenozoic
Creator: Ann Dunlea
Host Institution: Woods Hole Oceanographic Institution
Date Issued: 2019-04-01
End Date: 2022-03-31
Project Funding: 415529(USD)
Subtype: Standard Grant
Funding Organization: US-NSF
Language: 英语
Country: 美国
Abstract in English: Iron limits primary productivity in the modern Southern Ocean. This, in turn, reduces the amount of atmospheric carbon dioxide that is taken up by the high-latitude oceans. These observations raise a number of fascinating and hitherto unanswered questions, namely: what are the major sources of iron to the Southern Ocean? How resilient or variable is the supply of iron from these sources over geologic time? How has the iron cycle responded to long-term changes in Earth's climate? Have changes in the iron cycle influenced those of other nutrients, such as silica? This project will address these questions by means of a multifaceted approach examining the origin of the sediment, deposition rates, and quantification of iron sources therein. The detailed records obtained will be used to examine how changes in ocean nutrient cycles relate to the major tectonic, climatic, and biogeochemical reorganizations that have occurred over the past 66 million years ago. The holistic framework used will consider the interplay of these major Earth system processes and quantify their individual roles in shaping iron delivery to the largest iron-limited biome on Earth.

This project will quantify the major sources of iron to the Southern Ocean and how they changed in space and time, based on the geochemistry of metal-rich deep-sea clay sequences drilled by the International Ocean Discovery Program. This will be achieved by combining statistical modeling of the origin of the clay with radiometrically-constrained deposition rates and explicit quantification of iron sources therein. The resultant reconstructions will be used to test hypotheses regarding: the significance of hydrothermally-derived iron to the high-latitude oceans over the Cenozoic; how the opening of tectonic gateways redistributed deeply-sourced iron within the Southern Ocean; how the supply of dust-derived iron changed as Australia became a desert; and, if there were changes in the iron cycle associated with the proliferation of diatoms. This project complements ongoing research conducted as part of the GEOTRACES program, will engage K-12 students from communities underrepresented in STEM, and will support two early-career researchers.

This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
Subject of Source: Geosciences
URL: 查看原文
Resource Type: 项目
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Ann Dunlea. The Southern Ocean's Iron Cycle through the Cenozoic. 2019-04-01.
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