Profil de Chuxian LI
Email : chuxian.liSPAMFILTER@ensat.fr
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Institution : UPS
Statut / status: Doctorant
I am currently a CSC-UPS PhD fellow working together with F. De Vleeschouwer (EcoLab) and J. Sonke (GET) on using geochemical proxies to understand the cycle of atmospheric dust and mercury in the Holocene in remote areas such as Amsterdam Island (French Austral Ferritories), the Falkland Islands and Tierra del Fuego.
2008/09-2012/06: SOUTHWEST UNIVERSITY Environmental Engineering
2012/09-2015/08: SOUTHWEST UNIVERSITY Environmental Science
2009/4-2009/11: 6-month assistantship to Associate Professor Zhao Xiulan: Environmental Monitoring Project of the rivers in Fulin Area (nitrogen and phosphorus concentrations of water samples)
2010/7-2010/8: assistantship to Researcher Zhu Bo (Chinese Academy of Sciences): sampled from fields and analyzed the concentrations of nitrogen and phosphorus
The main objectives of my PhD are: 1) to provide high-resolution continuous records of natural atmospheric dust and Hg deposition using the elemental and isotopic signatures of peat cores form Southern South America, the Falkland Islands (South Atlantic Ocean) and Amsterdam Island (South Indian Ocean), and 2) to assess the linkage between dust, climate, human activities and atmospheric circulation. The questions to be answered are: 1/ how the pre-anthropogenic and anthropogenic chemical signals vary along time and space; 2/ what are the major factors affecting those variations; 3/ How widespread and important is trace metal contamination in these area of the world; 4/ is any specific pollution source or process detectable in remote areas such as Amsterdam Island. State-of-the-art analytical technologies will allow us to explore the use of a broad range of trace elements as dust proxies (soil particles, volcanism, marine aerosols). Radiogenic isotopes (Pb, Nd, Hf) will be used as tracers for fingerprinting predominant dust sources. Hg stable isotopes will be measured to assess Hg sources and transformations, mainly during pre-anthropogenic periods. Coupling these findings with biological proxies (plant macrofossils and detailed age-depth modelling already available and published, we expect not only to identify and interpret new links between atmospheric dust chemistry and climate change but also to significantly improve our understanding of peat bogs as archives of climate change, and the role of dust in both palaeoenvironmental and palaeoclimatic changes.