Continuous Flow Analysis of labile iron in ice-cores ...

• Main Authors: Hiscock, William Thomas, Fischer, Hubertus, Leuenberger, Daiana, Gfeller, Gideon, Mini, Olivia, Bigler, Matthias
• Format: Article in Journal/Newspaper
• Language: English
• Published: ACS Publications 2013
• Subjects: 530 Physics; Greenland; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.7892/boris.47727; http://boris.unibe.ch/47727/

The important active and passive role of mineral dust aerosol in the climate and the global carbon cycle over the last glacial/interglacial cycles has been recognized. However, little data on the most important aeolian dust-derived biological micronutrient, iron (Fe), has so far been available from ice-cores from Greenland or Antarctica. Furthermore, Fe deposition reconstructions derived from the palaeoproxies particulate dust and calcium differ significantly from the Fe flux data available. The ability to measure high temporal resolution Fe data in polar ice-cores is crucial for the study of the timing and magnitude of relationships between geochemical events and biological responses in the open ocean. This work adapts an existing flow injection analysis (FIA) methodology for low-level trace Fe determinations with an existing glaciochemical analysis system, continuous flow analysis (CFA) of ice-cores. Fe-induced oxidation of N,N′-dimethyl-p-pheylenediamine (DPD) is used to quantify the biologically more ...