9 Abril | Charla: "Rayos y Centellas en la Patagonia"

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El «Centro de Ciencia del Clima y la Resiliencia» (CR)2, invita a la charla del Prof. René Garreaud  (Subdirector del (CR)2, Académico del Departamento de Geofísica de la FCFM, Universidad de Chile. Ph.D. Meteorología en la Universidad de Washington, Seattle, EEUU.) El Miércoles 9 de Abril de 2014, a las 14:30 hrs. SALA DE SEMINARIOS- 5TO PISO, DPTO. GEOFÍSICA- FCFM- (Blanco Encalada 2002)

La charla será transmitida por streaming en: https://new.livestream.com/accounts/7520184

Resumen:

Based on eight years of lightning data (from January 2005 to December  2012) from the World Wide Lightning Location Network (WWLLN) we describe  the spatial distribution and temporal variability of lightning activity over Patagonia, with emphasis in the Chilean sector. Cloud electrification is not expected in this region given the predominance of stable, deep-stratiform precipitation there, but days with at least one stroke occur up to a third of the time along the coast.

Lightning density and frequency of lightning days exhibit a sharp maximum along the coast of southern Chile. Disperse strokes are also observed off southern Chile. In contrast, lightning activity is virtually inexistent over the austral Andes -where precipitation is maximum- and farther east over the dry lowlands of Argentina.

It is suggested that electrification could develop under weakly unstable conditions that prevail in the region after the passage of a cold front.

Large-scale ascent near the cyclone’s center may lift near-surface air parcels over open ocean fostering shallow convection, which is enhanced as the strong westerly flow ascend over the coastal topography.

We also show other applications of the WWLLN data, including nowcasting of flash floods in central Chile during summer and forest fire ignition.

Expositor:

René Garreaud es Subdirector del Centro de Ciencia del Clima y la Resiliencia (CR)2 e Investigador Principal de la Línea de Dinámica del Clima. Es Profesor Titular del Departamento de Geofísica de la Universidad de Chile. En el año 2000 obtuvo un Doctorado en Meteorología en la Universidad de Washington, Seattle, EEUU, trabajando en la interacción trópica-intertrópica modelando el clima de América del Sur bajo la tutela del Profesor Mike Wallace. Además es Ingeniero Civil y Magíster en Geofísica de la Universidad de Chile.

Para ver la charla en directo: https://new.livestream.com/accounts/7520184

(página: http://new.livestream.com/ Canal: “Difusión CR2”/ cr2prensa@gmail.com)