Avaliação de desastres no Rio Grande do Sul associados a complexos convectivos de mesoescala

Viana, Denilson Ribeiro; Aquino, Francisco Eliseu; Muñoz, Viviana Aguilar

doi:10.1590/s1982-45132009000200007

Cited by 16 publications

(19 citation statements)

References 8 publications

(5 reference statements)

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“…It is important to note that some previous studies examined MCC precipitation from a cloud-top threshold of 2328C (e.g., Viana 2006;Ashley et al 2003). For this study, MCC precipitation was assumed to fall solely within this swath.…”

Section: Methodsmentioning

confidence: 99%

“…However, the precipitation characteristics described by McAnelly and Cotton (1989) might be con-servative given they only considered late warm-season events. These values appear low compared to the results of Mota (2003) and Viana (2006) (40%-50% and 63%, respectively). Another critical factor among these differences may likely stem from data sources and approaches used in each study.…”

Section: A Period Of Recordmentioning

confidence: 99%

“…These results raise the question regarding MCC precipitation across SSA: do the physical characteristics described in Durkee and Mote (2009) suggest that relative to the United States, MCCs in SSA contribute more to the total warm-season rainfall? The initial work of Viana (2006) and Mota (2003) further supports this hypothesis. The initial work of Viana (2006) and Mota (2003) further supports this hypothesis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Contribution of Mesoscale Convective Complexes to Rainfall across Subtropical South America

2009

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This study uses a database consisting of 330 austral warm-season (October-May) mesoscale convective complexes (MCCs) during 1998-2007 to determine the contribution of MCCs to rainfall across subtropical South America (SSA). A unique precipitation analysis is conducted using Tropical Rainfall Measuring Mission (TRMM) 3B42 version 6 data. The average MCC produces 15.7 mm of rainfall across 381 000 km 2 , with a volume of 7.0 km 3 . MCCs in SSA have the largest precipitation areas compared to North American and African systems. MCCs accounted for 15%-21% of the total rainfall across portions of northern Argentina and Paraguay during 1998-2007. However, MCCs account for larger fractions of the total precipitation when analyzed on monthly and warm-season time scales. Widespread MCC rainfall contributions of 11%-20% were observed in all months. MCCs accounted for 20%-30% of the total rainfall between November and February, and 30%-50% in December, primarily across northern Argentina and Paraguay. MCCs also produced 25%-66% of the total rainfall across portions of west-central Argentina. Similar MCC rainfall contributions were observed during warm seasons. An MCC impact factor (MIF) was developed to determine the overall impact of MCC rainfall on warm-season precipitation anomalies. Results show that the greatest impacts on precipitation anomalies from MCC rainfall were located near the center of the La Plata basin. This study demonstrates that MCCs in SSA produce widespread precipitation that contributes substantially to the total rainfall across the region.

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Section: Methodsmentioning

confidence: 99%

Section: A Period Of Recordmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Contribution of Mesoscale Convective Complexes to Rainfall across Subtropical South America

2009

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“…A maior frequência de vendaval e granizo no RS, que também foi observada por outros autores (Viana et al, 2009;Nedel et al, 2012), deve-se ao fato que, na região sul do Brasil em comparação à outras regiões observa-se condições baroclínicas mais intensas (Grimm, 2009) e, portanto forte cisalhamento vertical do vento que favorece a formação de tempo severo, cuja definição tradicional inclui a ocorrência de vendaval e granizo.…”

Section: Resultados E Discussão 31 Eventos Severos Que Atingiram O Runclassified

Severe Events on Rio Grande do Sul from 2004 to 2008

Vargas

Campos

2015

Anuário IGEO UFRJ

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ResumoAnalisou-se a ocorrência de eventos severos no Rio Grande do Sul (RS) entre 2004 e 2008, as regiões atingidas por estes e o impacto do evento severo que atingiu o maior número de municípios. Utilizaram-se dados de ocorrência de eventos severos no RS e municípios atingidos por estes, obtidos no banco de dados da Coordenadoria Estadual de Defesa Civil do RS. Os resultados mostraram que: 247 eventos severos atingiram 55,6% dos municípios que compõem o RS; vendaval e granizo foram os eventos severos mais frequentes registrados; Out-Nov-Dez e Jul-Ago-Set foram os trimestres do ano com maior registro de ocorrência e a região mais atingida pelos eventos severos foi a porção norte do Estado. Observou-se ainda que granizo atingiu 47,8% dos municípios do RS afetados por eventos severos, gerou situação de emergência em 70,2% das comunicações e atingiu preferencialmente o noroeste do Estado. Palavras-chave: Desastres naturais; granizo; situação de emergência AbstractIt was analyzed the occurrence of severe events in the Rio Grande do Sul (RS) from 2004 to 2008, the regions affected by them and the impact of severe event that reached the greatest number of municipalities. Data of severe events occurrence and RS municipalities affected by them, obtained from CEDCRS (Coordenadoria Estadual de defesa Civil do RS) database, were used. The results showed that: 247 severe events affected 55,6% of the RS municipalities; windstorm and hail were the RS severe events more frequently registered; the quarters and the RS region most affected by severe events were Oct-Nov-Dec and Jul-Aug-Sep, and the north portion of state, respectively. In addition, hail affected 47,8% of RS municipalities affected by severe events; generated emergence situation in 70,2% of communications, and reached preferentially the northwest of state.

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“…Gustavo Rasera & Cláudia Rejane (Viana et al, 2009;Vargas Jr. et al, 2011), deve-se ao fato que, na região sul do Brasil em comparação à outras regiões observa-se condições baroclínicas mais intensas e, portanto forte cisalhamento vertical do vento que favorece a formação de tempo severo, cuja definição tradicional inclui a ocorrência de vendaval e granizo. Por isso, a região sul do Brasil, e mais especificamente o RS, é bastante favorável à ocorrência destes tipos de ES, uma vez que as tempestades convectivas tendem a tornarem-se severas (com ocorrência de vendaval e granizo) quando se desenvolvem sob condição de forte cisalhamento vertical do vento, condição essa observada no RS.…”

Section: Análise Sazonal Das Regiões Do Rio Grande Do Sul Atingidas Punclassified

Análise Sazonal das Regiões do Rio Grande do Sul Atingidas por Eventos Severos Gerados por SCM no Período de 2004 a 2008

Rasera

Campos

2013

Anuário IGEO-UFRJ

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ResumoOs Episódios de desastre desencadeados por fenômenos meteorológicos severos, também conhecidos como Eventos Severos (ES), como por exemplo, vendaval, granizo e enchente, têm sido estudados com frequência devido à gravidade dos danos que estes causam à sociedade. Um dos sistemas meteorológicos que é bastante comum no Rio Grande do Sul (RS), e que frequentemente está associado aos ES são os Sistemas Convectivos de Mesoescala (SCM). Como a economia do RS é voltada majoritariamente para a agricultura, que é bastante suscetível às mudanças do tempo, é frequente no Estado a ocorrência de prejuízos econômicos causados por ES. AbstractDisaster episodes caused by severe meteorological phenomena, also known as Severe Events (SE), such as windstorms, hail and flood have been studied extensively due to the hazard posed to society. One of the meteorological systems that is fairly common in Rio Grande do Sul state (RS), Brazil, and that is often associated with the SE are Mesoscale Convective Systems (MCS). Since the economy of RS is mostly based on agriculture, which is an activity very susceptible to changes in weather, economic losses caused by SE in RS are rather frequent. Given this point, the objective of this work was to analyze the seasonal distribution of regions affected by SE generated by MCSs that reached RS (SE MCSRS ) in the period from 2004 to 2008. For this study, different data sources were used: SE reports and municipalities affected by SE (MA SE ) obtained from RS Civil Defense data base; trajectories of the MCS that reached RS (MCS RS ) based on Forecasting and Tracking of Active Cloud Clusters (ForTrACC) analysis tool; and raw infra-red (channel 4) satellite imagery from GOES 10 and 12 satellites. The results showed that: i) about 45% of the reported SE in RS were associated to MCS RS ; ii) 58% of the MA SE were affected by MCS RS; iii) the north portion of RS was the most affected by SE MCSRS ; iv) windstorm and hail were the types of SE MCSRS that affected the largest number of municipalities and v) JAS (Jul-Aug-Sep) was the quarter that presented the largest number of municipalities affected by SE SCMRS (MA SE-MCSRS ).

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Avaliação de desastres no Rio Grande do Sul associados a complexos convectivos de mesoescala

Cited by 16 publications

References 8 publications

The Contribution of Mesoscale Convective Complexes to Rainfall across Subtropical South America

The Contribution of Mesoscale Convective Complexes to Rainfall across Subtropical South America

Severe Events on Rio Grande do Sul from 2004 to 2008

Análise Sazonal das Regiões do Rio Grande do Sul Atingidas por Eventos Severos Gerados por SCM no Período de 2004 a 2008

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