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Trace elements in Diatom frustules as a paleochemical proxy (TRADIA) - an integrated field and laboratory approach - Phase II

English title Trace elements in Diatom frustules as a paleochemical proxy (TRADIA) - an integrated field and laboratory approach - Phase II
Applicant Ariztegui Daniel
Number 116350
Funding scheme Project funding
Research institution Département des sciences de la Terre Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Geology
Start/End 01.07.2007 - 31.12.2007
Approved amount 32'120.00
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Keywords (6)

Calibration of proxy; diatoms; laboratory cultures; primary productivity; pollution; lacustrine and marine sediments

Lay Summary (English)

Lead
Lay summary
The elemental stoichiometries of marine and freshwater algae simultaneously reflect the nutrient ratios of the aquatic environment and control the input of recycled elements through remineralization. Most attention has been focused on the C, N and P content of plankton; only a few early studies have determined their trace metal composition. More recent evidence that trace metal nutrients such as iron can limit primary production in both open-ocean and coastal environments has encouraged researchers to further study the trace metal content of plankton. The emphasis of this proposal is to address key questions concerning the use of diatoms as a paleochemical proxy, by integrating laboratory culture experiments and sedimentary cores in concert with the application of converging disciplines. In order to identify and quantify the influence of the processes controlling the incorporation of trace elements into the frustules of selected diatoms, we propose to continue with the experimental and field activities initiated in the first phase of the TRADIA project.
To achieve our goals we will,

- interpret and model the results of the algal cultures experiments performed in the first phase of the project;
- compare these results with those from natural diatoms extracted from the most recent sediments of Lake Geneva comprising the documented history of pollution;
- use of this calibrated model to interpret changes throughout lake Geneva last ~500 years sequence; and
- apply this modern analogue to southern ocean sediments.

Our approach will provide a unique opportunity to obtain trace elements profiles that have not been affected by diagenetic remobilization, a phenomenon that can strongly bias metal analyses on the bulk fraction of the sediments. The integration of lacustrine and marine reconstructions of long-term environmental data at various geographical scales will allow developing predictive patterns of climatic- and/or human-induced changes of major societal interest.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

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Associated projects

Number Title Start Funding scheme
107475 Trace elements in Diatom frustules as a paleochemical proxy (TRADIA) - an integrated field and laboratory approach 01.07.2005 Project funding

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