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BEGIN:VEVENT
DTSTAMP:20260406T182223Z
DTSTART;VALUE=DATE-TIME:20121031T130000
DTEND;VALUE=DATE-TIME:20121031T140000
SUMMARY:Complexity Forum: Gustavo Martinez Mekler (Universidad Nacional A
 utónoma de México)
TZID:Europe/London
UID:20121031-094d43d5385c299a01386c3bd8d976f1@warwick.ac.uk
CREATED:20120329T091422Z
DESCRIPTION:Speaker: Gustavo Martinez Mekler (Instituto de Ciencias Físic
 as\, Universidad Nacional Autónoma de México) Title: Evolution of a Pale
 olake Subject to Volcanic Activity Abstract: On certain occasions Nature
  gives us access to privileged sources of information\, such is the case
  of diatomite beds from a paleolake in Mexico that was heavily disturbed
  by volcanic eruptions over 2 million years ago. Computed tomography (CT
 ) measurements\, along blocks chiseled out of mine walls dug out from th
 e extinct lake's bed\, provide a sediment density fluctuation series. Th
 is information together with diatom species microscopy determinations an
 d proton induced X ray emission studies (PIXE)\, suggests\, in the light
  of a complex systems analysis\, a scenario for the lake's evolution [1]
 . Statistical scaling properties are studied by tools previously develop
 ed for the study of intermittency in turbulent flows [2]. Within this fr
 amework\, the determination of correlations puts into evidence the role 
 of rare events (strong volcanic perturbations) in the onset of scale inv
 ariant regimes. These findings\, in conjunction with diatom cluster anal
 ysis resulting from microscopy observations\, suggest the presence of an
  underlying self-organized diatom dynamics [2\,3]. Additionally\, the oc
 currence of a threshold in the lake's depth above which a sharp dominanc
 e shift between the main coexisting diatom species took place is also in
 ferred. The overall picture is a transition from eutrophic to mesotrophi
 c conditions\, which is opposite to the usual pattern. Our analysis attr
 ibutes geological activity\, mainly volcanism and faulting as main facto
 rs for the lake´s ecological transformations [1]. Comments on the modeli
 ng of this system in terms of both stochastic and deterministic dynamics
  will also be forwarded. The study is based on an interchange between th
 eory\, experiment and field work\, supported by the confluence of geolog
 y\, physics\, mathematics\, statistics\, biology and ecology\, both at t
 he level of methods and concepts. [1] G. Vilaclara\, G. Martínez-Mekler\
 , E. Cuna\, E. Ugalde\, “Diatom-inferred palaeoenvironmental changes of 
 a Pliocene lake disturbed by volcanic activity”\, Journal of Paleolimnol
 ogy\, Vol 44\, 203-215 (2010). [2]Edgardo Ugalde\, Gustavo Martínez-Mekl
 er\, Gloria Vilaclara\, “Scaling and extended scaling in sediment regist
 ers of a paleolake perturbed by volcanic activity\, Physica A\, Vol. 366
 \, 485-494 (2006). [3] G. Martínez-Mekler\, E. Ugalde\, G. Vilaclara\, “
 Power spectrum crossover in sediments of a paloelake distrubed by volcan
 ism”\, Eur. Phys. J.\, Special Topics\, 143\, 217-222 (2007) Lunch group
 : 4
LOCATION:D1.07
CATEGORIES:forum
LAST-MODIFIED:20120709T145410Z
ORGANIZER;CN=Karen McKinley:
END:VEVENT
END:VCALENDAR