[Todos] [Coloquios] Coloquios DCAO/CIMA - MIËRCOLES (27/11/2019): “Identification of droughts and heatwaves in the Western Mediterranean, variability and impacts on vegetation and wildfires.”

[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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MIÉRCOLES  27/11, a las 13h:
Aula 8-⁠DCAO, 2° Piso, Pabellón 2

"Identification of droughts and heatwaves in the Western Mediterranean, 
variability and impacts on vegetation and wildfires."

Antoine Guion
Esutdiante de doctorado del ’Laboratoire de Météorologie Dynamique’ 
(LMD(/IPSL) en la ‘École Polytechhnique’ (Palaisseau, Francia)
In line with what is expected in a context of global warming, droughts 
and heatwaves have increased both in frequency and intensity over the 
last century. Severe wildfires and vegetation depletion can result from 
those extreme weather events with considerable economical, social and 
environmental damages.
For the development of mitigation and adaptation strategies, there is a 
request for exhaustive vulnerability assessments of the impacts of 
droughts and heatwaves on the Mediterranean environment.
If heatwave characteristics are well documented, similar studies about 
droughts are partial. Most of them are focused on meteorological 
droughts while agronomical ones are more complex to identify.
Using a coupled land surface–atmosphere regional model with the 
integration of plant phenology, droughts and heatwaves occurring in the 
Western Mediterranean over the last 40 years are analysed. These extreme 
events are identified using two complementary methods: the percentile 
limit anomalies and the Standardized Precipitation Evapotranspiration 
Index (SPEI).
Impact assessment analysis have been performed and showed significant 
and dominant effect of droughts on plant phenology during summer. 
Evaluated using the Leaf Area Index, plant depletion can reach more than 
50%. Response to drought depends on the vegetation type (long vs short 
root system) and biome (temperate vs semi-arid).
Wildfire meteorological risk (Fire Weather Index) has been computed from 
the coupled model outputs. Even if extreme high temperature is the 
dominant cause, drought contributes to an increase of risk. Simultaneous 
heatwaves and droughts are the worst environmental conditions. Those 
results have been confirmed by wildfires observed from MODIS satellite 
instrument; the burned area can be ±4 times greater than during 
non-extreme conditions and the fire duration ±0.25 times longer.

¡¡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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