Eventos De Chuva Intensa Na Bacia Hidrográfica Do Rio Piratini: Relação Com Enos E Estudo De Caso

Ogassawara, Jéssica Fernanda; Nunes, André Becker; Riquetti, Nelva Bugoni

doi:10.5380/rbclima.v28i0.72705

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…The total column of water vapor field shows the association of NAL with the frontal system to the south, over the ocean. The trough extended from the NAL towards RS is a pattern easily found in cases of heavy rain over the State (Riquetti et al, 2018;Dorneles et al, 2020;Ogassawara et al, 2021). Even with the intrusion of a post-frontal anticyclone in RS on the 12th (Figure 8b), the northern moisture flow was maintained and driven by mid-levels flow.…”

Section: Resultsmentioning

confidence: 64%

Preliminary study on the case of black rain in Rio Grande do Sul, Brazil: A synoptic point of view

Santiago

Santos²,

Cardoso³

et al. 2021

Rev. Bras. Geog. Fis.

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Particles of soot from forest fires are transported by the wind, reaching distant locations and being deposited on the soil through precipitation, which clears the atmosphere, taking suspended particulate matter into its drops. The general circulation over South America indicates the possibility of soot from forest fires in the Amazon and Pantanal to be transported to southern Brazil. The event called “black rain” was observed in the period from 11 to 13 September 2020 at São Francisco de Assis City, in Rio Grande do Sul State (RS), and so this work aims to analyze if there were any anomalies of the flow that favored the occurrence of this event, given that there was a large number of fires in this period. Through ERA5 reanalysis data and GOES-16 satellite images, it was observed that on the three days under study low-level flow to the south of Brazil was more intense than normal, with the Low Level Jet occurrences, and on days 12 and 13 such flow to the south was also observed at 500 hPa. The precipitation was due to the instability of an extended trough from the Northwestern Argentinean Low. Thus, it is believed that there was a contribution from circulation at low and mid levels in the occurrence of black rain over RS.

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Section: Resultsmentioning

confidence: 64%

Preliminary study on the case of black rain in Rio Grande do Sul, Brazil: A synoptic point of view

Santiago

Santos²,

Cardoso³

et al. 2021

Rev. Bras. Geog. Fis.

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show abstract

“…Ao longo das últimas décadas, diversos estudos, com auxílio de dados observacionais e simulações numéricas, têm sido publicados com o objetivo de analisar e quantificar os fatores de diferentes escalas que influenciam a frequência e a intensidade de distúrbios atmosféricos significativos sobre o sul do Brasil, como por exemplo, Teixeira e Satyamurty (2007), Reboita et al (2009), Ribeiro et al (2016), Caballero et al (2018), Cardoso et al (2020), Dorneles et al (2020), Ogassawara et al (2021), Ramos et al (2021), Santos et al (2022) e Scaglioni et al (2022).…”

Section: Introductionunclassified

Investigação do ambiente atmosférico durante chuva histórica ocorrida em São Lourenço do Sul - RS

Júnior¹,

Nunes²

2022

CONJ

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O evento de chuvas intensas ocorrido entre os dias 09 e 10 de março de 2011 no município de São Lourenço do Sul é discutido no presente trabalho. Devido aos efeitos desse evento, os objetivos do estudo são: a) levantar e comparar os dados disponíveis de precipitação para as datas e para o local do evento; b) fazer uma análise sinótica do evento, a partir dos campos de variáveis meteorológicas de reanálise do modelo ERA-5, identificando as forçantes que favoreceram sua ocorrência. Quanto à precipitação, este evento caracterizou-se por chuvas localizadas, de grande volume e concentrado em um curto espaço de tempo, com valores superiores aos do referencial de estado de alerta. A análise sinótica indicou que o fenômeno de chuvas intensas analisado esteve associado a um anticiclone de bloqueio originado no Oceano Atlântico e a formação de um vórtice ciclônico entre o sul do Rio Grande do Sul e o norte do Uruguai. O acompanhamento temporal de campos de variáveis meteorológicas permitiu identificar o momento de origem e o declínio dessas perturbações atmosféricas, que culminou em elevados níveis de precipitação e consequentes danos a infraestrutura e a população local.

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Validation of precipitation data generated by ERA5 reanalysis for the Mirim-São Gonçalo watershed, Brazil

Cardoso,

Santiago,

Rodrigues

et al. 2024

Rev. Bras. Geog. Fis.

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The transboundary Mirim-São Gonçalo watershed (MSGW) is of a paramount importance for the development of its region, mainly for the agricultural sector. Obtaining climate data is fundamental in the management of water resources, as it allows estimating missing data, making long-term forecasts and checking possible trends. The European Center for Medium-Range Weather Forecasts (ECMWF) produces numerical weather forecasts, being the fifth generation of reanalysis (ERA5) the most recent. This work aimed to evaluate the efficiency of ERA5 in representing precipitation for the Brazilian side of MSGW, comparing its grid points data with the observed ones from rain gauges. For this purpose, the ERA5 and observed monthly climatological 1981-2020 rain data of the MSGW was calculated. The stationarity of the data was evaluated by applying the Mann-Kendall’s (MK) and Sen’s Slope (SS) tests, while the data homogeneity was verified with the Pettitt (Pt) test. For data validation, the Mean Absolute Percentage Error (MAPE), Root Mean Squared Error (RMSE) and Pearson's correlation coefficient (rpearson) were calculated. MK and SS tests verified that there is no significant trend in the majority of the precipitation series, while the Pt test pointed out that there is no significant changing point (5% of significance level). The error measures (MAPE and RMSE) were low while the rpearson presented high correlation values (strong and positive), indicating the good performance and the potential of the ERA5 model in representing the precipitation data in the MSGW.

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Eventos De Chuva Intensa Na Bacia Hidrográfica Do Rio Piratini: Relação Com Enos E Estudo De Caso

Cited by 5 publications

References 24 publications

Preliminary study on the case of black rain in Rio Grande do Sul, Brazil: A synoptic point of view

Preliminary study on the case of black rain in Rio Grande do Sul, Brazil: A synoptic point of view

Investigação do ambiente atmosférico durante chuva histórica ocorrida em São Lourenço do Sul - RS

Validation of precipitation data generated by ERA5 reanalysis for the Mirim-São Gonçalo watershed, Brazil

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