[Todos] [Coloquios] HOY MIERCOLES 18/10: "The wonder of peatlands: Archives of environmental changes and human impacts"

[Coloquios CIMA-DCAO]

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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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MIERCOLES 18/10, a las 13HS:
Aula 8-⁠DCAO, 2° Piso, Pabellón 2
"The wonder of peatlands: Archives of environmental changes and human 
impacts"

Dr. F. De Vleeschouwer, EcoLab, CNRS, Université de Toulouse, Castanet 
Tolosan, France.

Peat deposits are formidable terrestrial archives for Holocene 
environmental changes as well as Human impacts. Some peatlands (bogs) 
are only fed by atmospheric inputs and therefore have a potential to 
record a more global (i.e. hemispheric) signature than other continental 
deposits (e.g. river and lake sediments). Easily datable, they can 
produce high-resolution, precisely dated records covering the Holocene 
and beyond. The widespread occurrence of peats in mid- to high latitudes 
of both hemispheres compared to other sedimentary records ought to make 
them particularly suitable for global hemispheric comparison and to 
answer major global climate change questions. Through examples selected 
from the literature as well as from ongoing studies, we will provide
an insight into significant advances in the reconstructions of Holocene 
climate and natural/anthropogenic environmental changes from peat 
deposits from both hemispheres.

A special attention will be given to Southern South America. Indeed, 
Patagonia is considered to be an important atmospheric dust source in 
the Southern Hemisphere. During glacial periods dust plumes would reach 
as far as Antarctica while interglacials are characterised by a lower 
dust load. Regardless the lower levels of atmospheric dust deposition 
since the Last Glacial Maximum, they still have an important 
environmental impact as demonstrated by today’s’ phytoplankton blooms in 
the South Atlantic. Ombrotrophic mires have proven to provide excellent 
records of atmospheric dust deposition for the Holocene as their 
accumulation rates are higher than any other archive. Over the last 5 
years, we sampled and analysed several peatlands from Patagonia and 
Tierra del Fuego to investigate Holocene dust depositions and related 
paleoenvironmental changes in southern South America. Our geochemical 
results (major, trace elements and neodymium isotopes) will be discussed 
in terms of implications for dust fluxes and sourcing during the 
Holocene and beyond.

Los esperamos!!


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Grupo Coloquios

Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA)

Centro de Investigaciones del Mar y la Atmósfera (CONICET-UBA)

Ciudad Universitaria, 2do piso.

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