Produção Nacional
Revisado por pares
Synoptic patterns associated with landslide events in the Serra do Mar, Brazil
2009; Springer Science+Business Media; Volume: 98; Issue: 1-2 Linguagem: Inglês
10.1007/s00704-008-0101-x
ISSN1434-4483
AutoresMarcelo E. Seluchi, Sin Chan Chou,
Tópico(s)Landslides and related hazards
ResumoHeavy rains frequently occur over the Serra do Mar, in the southeast coastal mountain region in Brazil, particularly during the summer season. These rains can cause landslides and loss of life. The objective of this work is to produce a synoptic climatology of heavy rainfall episodes of the period from November to April using 10-year reanalyses data. The identification of the synoptic pattern of these events should provide guidance to forecasters. The landslide events were mostly related to cold front passages and the South Atlantic Convergence Zone (SACZ). These systems differed from the climatology by exhibiting more intense characteristics for the frontal situations and a blocking circulation configuration for the SACZ situations. In both cases, the composite fields showed that the 250-hPa mass divergence was strikingly more intense than the climatology and had a preferred location in the 24 h prior to landslide events. Anomalies of this ten-year event climatology showed above-normal moisture anomalies, which are more evident in the SACZ than in the frontal cases.
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