[Todos] [Coloquios] RECORDATORIO COLOQUIOS: PROXIMA SEMANA

[Coloquios CIMA-DCAO]

***************************************************************************
                         Coloquios del
   Departamento de Ciencias de la Atmósfera y los Océanos DCAO)/⁠
         Centro de Investigaciones del Mar y la Atmósfera (CIMA)

***************************************************************************

LUNES 18/09, 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.


MIERCOLES 20/09, a las 13HS:
Aula 8-⁠DCAO, 2° Piso, Pabellón 2
"Topological analysis of geophysical flows"

Dra. Denisse Sciamarella (Institut Franco-Argentin d'études sur le 
climat et ses impacts (IFAECI), UMI 3351)

Topology plays a central role when it comes to unveiling the underlying 
structure of chaotic flows from data. The question: 'are there different 
classes of chaotic behavior?' is intrinsically related with the topology 
of chaotic attractors in phase space. On the other hand, topology also 
plays an important role in fluid mechanics, when it comes to a 
mathematical-physics perspective encompassing applications as diverse as 
airflow behavior in the larynx up to large-scale dispersion of 
pollutants in Earth's atmosphere and oceans. This talk provides an 
overview of scientific progress in both contexts, and examines potential 
applications of topological methods to the analysis of geophysical 
flows, with the goal of understanding the basic processes which are most 
important in describing what we observe, directly or indirectly, in 
these complex systems.


Los esperamos!!


***************************************************************************

Para ver nuestro calendario con la lista completa de oradores, puede 
hacerlo desde:
  http://goo.gl/XkF8Xq

O suscribase a nuestro calendario descargando e importando el siguiente 
archivo:
   http://goo.gl/T2ob0t



***********************************************************************

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.

email: coloquios en cima.fcen.uba.ar

http://www.at.fcen.uba.ar/charlas_not.php

http://www.cima.fcen.uba.ar/espanol/index.htm

**********************************************************************


_______________________________________________
Lista_Coloquios mailing list
Lista_Coloquios en cima.fcen.uba.ar
http://lists.cima.fcen.uba.ar/mailman/listinfo/lista_coloquios