Iron in the NEEM ice core relative to Asian loess records over the last glacial–interglacial cycle
| Autor: | Simon Schüpbach, Jiawen Ren, Chuanjin Li, Cunde Xiao, Yuefang Li, Jean-Robert Petit, Junji Cao, Paul Andrew Mayewski, Tong Zhang, Yeongcheol Han, Michael Handley, Zhiheng Du |
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| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
AcademicSubjects/SCI00010 Iron fertilization 01 natural sciences 03 medical and health sciences Ice core Loess Glacial period Greenland NEEM ice core Holocene 030304 developmental biology 0105 earth and related environmental sciences 0303 health sciences Eemian Multidisciplinary carbon dioxide glacial–interglacial cycle Last Glacial Maximum iron fertilization Chinese loess Interglacial Earth Sciences Environmental science Physical geography AcademicSubjects/MED00010 Research Article |
| Zdroj: | National Science Review |
| ISSN: | 2053-714X 2095-5138 |
| Popis: | Mineral dust can indirectly affect the climate by supplying bioavailable iron (Fe) to the ocean. Here, we present the records of dissolved Fe (DFe) and total Fe (TDFe) in North Greenland Eemian Ice Drilling (NEEM) ice core over the past 110 kyr BP. The Fe records are significantly negatively correlated with the carbon-dioxide (CO2) concentrations during cold periods. The results suggest that the changes in Fe fluxes over the past 110 kyr BP in the NEEM ice core are consistent with those in Chinese loess records because the mineral-dust distribution is controlled by the East Asian deserts. Furthermore, the variations in the dust input on a global scale are most likely driven by changes in solar radiation during the last glacial–interglacial cycle in response to Earth's orbital cycles. In the last glacial–interglacial cycle, the DFe/TDFe ratios were higher during the warm periods (following the post-Industrial Revolution and during the Holocene and last interglacial period) than during the main cold period (i.e. the last glacial maximum (LGM)), indicating that the aeolian input of iron and the iron fertilization effect on the oceans have a non-linear relationship during different periods. Although the burning of biomass aerosols has released large amounts of DFe since the Industrial Revolution, no significant responses are observed in the DFe and TDFe variations during this period, indicating that severe anthropogenic contamination has no significant effect on the DFe (TDFe) release in the NEEM ice core. |
| Databáze: | OpenAIRE |
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