1. The iron records and its sources during 1990-2017 from the Lambert Glacial Basin shallow ice core, East Antarctica.
- Author
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Du Z, Xiao C, Mayewski PA, Handley MJ, Li C, Ding M, Liu J, Yang J, and Liu K
- Subjects
- Antarctic Regions, Biomass, Dust analysis, Iron chemistry, Metals, Temperature, Environmental Monitoring, Ice Cover chemistry, Iron analysis
- Abstract
In this study, a shallow ice core (12.5 m, called LGB) was drilled at the Lambert Glacial Basin, East Antarctica. The major ion and metal elements were measured at 5-6 cm resolution in this shallow core, which covered the period 1990-2017. Therefore, an annual-resolution record of iron (Fe) concentrations and fluxes were reconstructed in this shallow ice core. Although the Fe data is comparable to previous results, our results emphasized that much more dissolved Fe (DFe) from the Cerro Hudson volcanic event (August 1991) was transported to the East Antarctic ice sheet, in comparison with the Pinatubo volcanic event (June 1991). The aeolian dust may be the primary DFe source during 1990-2017. In particular, the DFe variations may be affected by the biomass burning emissions in two periods (1990-1998 and 2014-2017). While total dissolved Fe (TDFe) variations were controlled by the climatic conditions since 2000 because of the temperature (δ
18 O) decreasing at East Antarctica. These Fe data will be useful to assess the modern bioavailable Fe release for the Antarctica ice sheet., Competing Interests: Declaration of competing interest The authors declare that they have no conflict of interest., (Copyright © 2020 Elsevier Ltd. All rights reserved.)- Published
- 2020
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