Origin and characterisation of microparticles in an ice core from the Central Dronning Maud Land, East Antarctica
- 121 Downloads
The scanning electron microscopy–energy dispersive spectroscopic (SEM–EDS) study of selected samples from an ice core collected from Central Dronning Maud Land (CDML), East Antarctica, revealed several microparticles. They are mainly siliceous and carbonaceous particles and have distinct variations in their shape and composition. The morphology and major element chemistry of the particles suggest their origin from either volcanic eruptions or continental dust. The EDS analysis revealed that the volcanic particles are enriched in silica (average SiO2 62%), compared to the continental dust particle (average SiO2 56%). We found that the tephra relating to Agung (1963) and Karkatau (1883) volcanic eruptions, as recorded, in the ice core harbored microbial cells (both coocoid and rods). The occurrence of organic and inorganic particles which bear relation to volcanic eruption and continental dust implies significant environmental changes in the recent past.
KeywordsTephra Dust Microbe Nanobe Ice core East Antarctica
Unable to display preview. Download preview PDF.
- Clausen, H. B., Hammer, C. U., Hvidberg, C. S., Dahl-Jensen, D., Steffensen, J. P., Kipfstuhl, J., & Legrand, M. (1997). A comparison of volcanic records over the past 4000 years from the Greenland Ice Core Project and dye 3 Greenland ice cores. Journal of Geophysical Research, 102, 26, 707–723.Google Scholar
- Davis, S. M., Mortensen, A. K., Baillie, M. G. L., Clausen, H. B., Gronvold, K., Hall, V. A., et al. (2004). Tracing volcanic events in the Greenland ice cores. Pages News, 12, 10–11.Google Scholar
- Deming, J. W., & Baross, J. A. (2000). Survival, dormancy, and nonculturable cells in extreme deep-sea environments. In R. R. Colwell, & D. J. Grimes (Eds.) Nonculturable microorganisms in the environment (pp. 147–197). Washington, DC: ASM.Google Scholar
- Folk, R. L., & Lynch, F. L. (1997). The possible role of nano-bacteria (dwarf bacteria) in clay-mineral diagenesis and the importance of careful sample preparation in high-magnification SEM study. Journal of Sedimentary Research, 67, 583–589.Google Scholar
- McConnell, J. R., Aristarain, A. J., Banta, J. R., Edwards, R. P., & Simoes, J. C. (2007). 20th Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America. Proceedings of National Academic Science, 104(14), 5743–5748.CrossRefGoogle Scholar
- Narcisi, B., Petit, J. R., Delmonte, B., Basile-Doelsch, I., & Maggi, V. (2005). Characteristics and sources of tephra layers in the EPICA-Dome C ice record (East Antarctica): Implications for past atmospheric circulation and ice core stratigraphic correlations. Earth and Planetary Science Letters, 239, 253–265.CrossRefGoogle Scholar
- Palais, J. M., Kirchner, S., & Delmas, R. J. (1990). Identification of some global volcanic horizons by major element analysis of fine ash in Antarctic ice. Annals of Glaciology, 14, 216–220.Google Scholar
- Pattan, J. N., Pearce, N. J. G., Banakar, V. K., & Parthiban, G. (2002). Origin of ash in the Central Indian Ocean Basin and its implication for the volume estimate of the 74,000 year BP youngest Toba eruption. Current Science, 83(7), 889–893.Google Scholar
- Saltzman, E. S. (1995). Ocean/atmosphere cycling of dimethylsulfide. In R. J. Delmas (Ed.) Ice-core studies of global biogeochemical cycle. NATO ASI Series. Series I, global environmental change (vol. 30, (pp. 65–89)). Berlin: Springer.Google Scholar
- Thamban, M., Chaturvedi, A., Rajakumar, A., Naik, S. S., D’Souza, W., Sings, A., et al. (2006). Aerosol perturbation related to volcanic eruptions during the past few centuries as recorded in an ice core from the Central Dronning Maud land, Antarctica. Current Science, 91(9), 1200–1207.Google Scholar
- Zielinski, G. A., Dibb, J. E., Yang, Q., Mayewski, P. A., Whitlow, S., Twickler, M. S., et al. (1997). Assessment of the record of the 1982 El Chichón eruption as preserved in Greenland snow. Journal of Geophysics Research, 102, 30 031–30 045.Google Scholar