[Todos] Coloquio extraordinario DCAO/CIMA - JUEVES (7/12/2023) 13hs: PRESENCIAL Pab II

[coloquios en cima.fcen.uba.ar]

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Coloquios del Departamento de Ciencias de la Atmósfera y los Océanos 
(DCAO)/
Centro de Investigaciones del Mar y la Atmósfera (CIMA)
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JUEVES 7/12 a las 13hs:

*** Presencial: Aula 8/Seminarios (CIMA, Pab II, 2do piso) ******

Para quienes no pueden acercarse:
https://exactas-uba.zoom.us/j/87610472649
Meeting ID: 876 1047 2649
Passcode: coloquios

Current and historical records of climate change and mining pollution in 
the central Andes using unconventional tracers and isotopes
Dr. Stéphane Guédron - Institute of Research for Development, ISTerre - 
University Grenoble Alpes, France

In the Anthropocene era, human activities are significantly affecting 
the natural cycle of chemical elements and compounds on local, regional 
and global scales. Studying the biogeochemical cycles of ubiquitous 
elements including contaminants [e.g., metal(loid)s] enables the 
understanding of the transfer processes of toxic species to trophic 
chains, and the mechanisms of degradation or scavenging in terrestrial 
compartments (water, soil, air and biota), in order to develop 
mitigation/remediation methods.
On the other hand, the understanding of elemental biogeochemical cycles 
in pristine environments and their transposition to paleoenvironmental 
studies allows to identify the drivers and magnitude of natural changes 
such as climate, volcanism…, and those related to anthropogenic 
activities.
In this presentation, I will present several case studies of elemental 
biogeochemical cycles in the aquatic ecosystems and sediment records of 
the Andean Altiplano, including conventional and unconventional 
elemental (i.e., Hg, Br, Se) or isotopic tracers.

Dr S. Guédron is a researcher in environmental geochemistry and 
paleoenvironmental studies at the Institute of Research for Development 
(IRD) within the Institute of Earth Sciences (ISTerre) at University 
Grenoble-Alpes, France, since 2011. He obtained his PhD degree in 
environmental geochemistry at Grenoble University, France in 2008.
His research focuses on the understanding of the bio-geochemical cycles 
(speciation, source, transport and transfer) of ubiquitous elements 
(i.e., metal, metalloids and halogens) in terrestrial (soils, peat), and 
aquatic ecosystems (i.e., lake, river, sediments ….) impacted or not by 
human activities. One of the main components of his research is the 
study temperate and tropical environments where he studies the dynamics, 
and the biogeochemical cycles of elements from the molecular to the 
catchment scale. He uses various tools and methodologies (elemental 
speciation and isotopic geochemistry, spectroscopy, mineralogy) to 
understand the geochemical cycles of metals, metalloids and halogens 
(e.g., mercury, lead, antimony, selenium, bromide and iodine) 
considering historical and current global changes, and man's historical 
footprint.
He has authored 57 peer review publications and regularly (co)supervises 
post-Docs, PhD, MSc and undergraduate students, as well as engineer 
staff in the field and laboratory. He is/has been PI or partner of 15 
French (ANR, EC2CO…), 3 swiss (FNRS), and 2 International (PNUD , ERC) 
projects.

¡¡Les esperamos!!

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Grupo Coloquios DCAO/CIMA
Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA)
Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA)
Ciudad Universitaria, Pabellón II, 2do piso.
email: coloquios en cima.fcen.uba.ar
http://www.at.fcen.uba.ar/charlas_not.php
http://www.cima.fcen.uba.ar/coloquios.php

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