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Titel |
Moisture Variations during the life cycle of cyclones in the east coast of South America |
VerfasserIn |
Ana María Durán-Quesada, Michelle Reboita, Alexandre M. Ramos, Rosmeri da Rocha, Raquel Nieto, Luis Gimeno |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250031795
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Zusammenfassung |
Three regions where a maxima in the cyclones frequency occurs through the year is observed
in the East coast of South America (coastal regions of Uruguay, south/southeastern Brazil and
southeastern Argentina), where local dynamic conditions enhance this phenomena to occur.
The importance of the cyclonic activity in this region regards local convection and associated
precipitation. Precipitation, fall of temperatures, strong winds and ocean waves associated
with storms affect significantly the population of the coastal zones. Three events have been
selected (one per each region) to analyze different aspects related to moisture along the life
cycle of the structure. The systems were tracked during its life cycle using an algorithm
based on the relative vorticity of wind at 10 meters height. Moisture variations for
the selected events were computed along the life of the structures implementing a
Lagrangian analysis technique. The mean Lagrangian trajectories were obtained for
each system using cluster analysis for the set of trajectories computed with the
FLEXPART model and ERA-40 data. Surface turbulent fluxes (latent and sensible
heat fluxes) were evaluated for each system. The main result of this analysis is the
relevant information obtained on the moisture content and variations of air parcels
through the life cycle of extratropical cyclones. The present work improves the
comprehension of moisture exchange between a cyclone and the surrounding air masses
using Lagrangian analysis methods as an alternative to the traditional Eulerian
approaches. |
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