Caracterização Sinótica e Climatológica de Eventos de Chuva Pós-Frontal no Rio de Janeiro

Bonnet, Suzanna Maria; Dereczynski, Claudine Pereira; Nunes, Ana M. B.

doi:10.1590/0102-7786333013

Cited by 13 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similarly, the variability with a period of around 5 days also showed statistical signi cance. In this region, this variability is associated with the passage of frontal systems during winter and the effect of SACZ during summer time (Dereczynski et al, 2009;Bonnet et al, 2018).…”

Section: Waveletsmentioning

confidence: 99%

Impact of Oceanic Oscillations in Annual Trends of Precipitation Extremes in the Paraíba do Sul River Basin Assessed Based on the PSL Daily Gridded Precipitation Dataset

Senna

França²,

Pereira³

et al. 2022

Preprint

View full text Add to dashboard Cite

The waters of the Paraíba do Sul River supply around 15 million people, most of whom live in metropolitan regions of the state of Rio de Janeiro. Climate change alters its precipitation regime and can cause an increase in the occurrence of extreme hydrological events. The variability of precipitation results from the combined effects of the surface conditions of the oceans and the variations in the dynamics of atmospheric systems. This work aims to detect possible changes in the climatic extremes of precipitation in the Paraíba do Sul hydrographic basin and to investigate evidences of correlation of these indices with the oceanic oscillations associated with the El Niño-Southern Oscillation, Pacific Decadal Oscillation, North Atlantic Oscillation and Atlantic Multidecadal Oscillation. Results indicate that the eastern and northeastern sectors of the basin present trends of increase in the total annual precipitation, in the number of very humid days and in the occurrence of extreme events, in a space of time up to five days. The west and southwest sectors, on the other hand, show decreasing trends in total annual precipitation, in the number of very humid days, but with an increase trend in the maximum amount of rainfall on five consecutive days. The central sector has characteristics of a transition zone. The correlation analyzes show that the majority of the oceanic oscillation indices have a very weak correlation with the extreme precipitation indices, while the wavelet transform does not indicate significant power at the low frequencies.

show abstract

Section: Waveletsmentioning

confidence: 99%

Impact of Oceanic Oscillations in Annual Trends of Precipitation Extremes in the Paraíba do Sul River Basin Assessed Based on the PSL Daily Gridded Precipitation Dataset

Senna

França²,

Pereira³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Portanto, a partir dos casos classificados como FFFs por Rosa (2017), será analisada a evolução temporal das variáveis atmosféricas em Cuiabá associadas a esses sistemas bem como será estudada a evolução espaço-temporal das FFF que chegam a tal localidade. Esse estudo se justifica devido à falta de trabalhos sobre o tema na região centro-oeste do Brasil; a maioria se destina às regiões sul e sudeste do Brasil (Foss, 2016;Seluchi et al, 2017;Bonnet et al, 2018;Neves, 2019).…”

Section: Introductionunclassified

Evolução Temporal das Variáveis Atmosféricas associadas a Casos de Frentes Frias Fortes em Cuiabá, MT, entre 1996 e 2015

Carmo

Reboita

Marques

2023

Rev. Bras. Geog. Fis.

View full text Add to dashboard Cite

Este estudo apresenta a climatologia de frentes frias fortes que atuaram na cidade de Cuiabá (MT) no período de 1996 a 2015, bem como a evolução temporal de campos atmosféricos quando da ocorrência desses sistemas. As frentes frias, independentemente da intensidade, foram inicialmente identificadas nos boletins CLIMANÁLISE disponibilizados pelo Instituto Nacional de Pesquisas Espaciais. Com a utilização de uma metodologia específica foram selecionados os casos considerados fortes e, a partir dessa informação, elaboraram-se mapas com dados da reanálise ERA5 para compreensão do padrão espacial das variáveis atmosféricas. No período de 1996 a 2015 foram identificadas 8 frentes frias fortes; o inverno, que é a estação seca da região em estudo, também é o período com maior frequência dessas frentes. As frentes frias fortes atuantes em Cuiabá, em geral, se formam três dias antes na costa da Argentina e se deslocam na direção sudoeste-nordeste chegando à região de estudo. Essas frentes são responsáveis por queda na temperatura do ar, mas praticamente não geram precipitação.Temporal Evolution of the Atmospheric Variables associated with Strong Cold Fronts in Cuiabá, MS, from 1996 to 2015 A B S T R A C TThis study presents a climatology of strong cold fronts that acted in Cuiabá (MT) from 1996 to 2015 as well as a temporal evolution of atmospheric fields when these systems occurred. Cold fronts, regardless of intensity, were identified in the CLIMANÁLISE bulletins from the National Institute for Space Research. After that, a specific methodology was applied for the selection of cases considered strong and, based on this information, maps with data from the ERA5 reanalysis were built in order to provide a view of the spatial pattern of the atmospheric variables. From 1996 to 2015, 8 strong cold fronts occurred; winter, which is the driest season in the studied region, is also the season with the highest frequency of these fronts. Strong cold fronts acting in Cuiabá, in general, form three days earlier on the coast of Argentina and move in a southwest-northeast direction reaching Cuiabá. These fronts are responsible for dropping in air temperature, but have little influence on precipitation.Keywords: cold fronts; temperature; precipitation; Mato Grosso.

show abstract

“…Among the meteorological systems that affect the Southeast Region of Brazil and the adjacent ocean, the cold fronts are one of the most important because they generally cause significant weather changes and occur more frequently than other transients (Satyamurty et al, 1998;Cavalcanti and Kousky, 2009). During the passage of an intense cold front, it is common to observe an increase in wind speed and change in its direction, an increase in cloudiness, besides heavy rains (Cavalcanti and Kousky, 2009;Andrade et al, 2015;Dereczynski and Menezes, 2015;Bonnet et al, 2018;Dereczynski et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The majority of works investigating the passage of cold fronts over the Brazilian continental region focus on precipitation caused during the displacement of these systems (Lima et al, 2010;Reboita et al, 2010;Dolif and Nobre, 2012;Dereczynski et al, 2017;Bonnet et al, 2018;Escobar et al, 2019). It is justifiable because heavy rainfall events are responsible for landslides, floods, river overflows, and other troubles that cause a high risk to the population, which may cause loss of life and material goods.…”

Section: Introductionmentioning

confidence: 99%

“…The main characteristics identified in the cold fronts associated with heavy rainfall events are: i) behind the cold front, intense migratory flows high on the surface; ii) strong moisture convergence associated with the cold front, and iii) great baroclinic trough at 500 and 250 hPa (Moura et al, 2013;Andrade and Cavalcanti, 2018;Bonnet et al, 2018). Franco et al (2020) analyzed 23 intense wind events that caused electrical power transmission towers to fall in Paraná state between 1980 and 2017.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cold fronts responsible for intense winds in the Santos Basin, Brazilian Southeast Offshore Region

Magalhães

Vasconcellos

Dereczynski

et al. 2023

Atm.

View full text Add to dashboard Cite

This work aimed to identify the synoptic conditions associated with the Frontal Systems (FSs) passage that causes intense winds in the Santos Basin (SB). Furthermore, the atmospheric characteristics of the FSs, which generated intense (INTW) and moderate (MODW) winds in the studied area were identified. For this purpose, INTW and MODW composites of FSs episodes were elaborated. First, the INTW and MODW cases were selected from the 10 meters wind intensity (W10M) observed in the Santos buoy, belonging to Brazil's National Buoys Program. Satellite images and synoptic surface charts were analyzed to identify the synoptic systems responsible for INTW and MODW in the Santos buoy, keeping only the cases generated by FSs. From the comparison between the INTW and MODW composites, it was possible to observe in INTW: i) a stronger pressure gradient over the SB, which caused the intense winds registered in the buoy; ii) a baroclinic trough at medium and high levels reaching the SB region, and located westward of the surface system; iii) stronger 1000-500 hPa layer thickness and dew point temperature gradients over the continent, reaching the SB region, indicating the position of the FS and iv) a colder and drier air mass over southern Brazil. In large scale, the Rossby wave tracings were analyzed, where different wavenumbers were noticed for each composite. In INTW, the wavenumber was 2, while in MODW, it was 2 and 3. For case studies of INTW and MODW, the main characteristics found in the respective composites were observed.

show abstract

Caracterização Sinótica e Climatológica de Eventos de Chuva Pós-Frontal no Rio de Janeiro

Cited by 13 publications

References 6 publications

Impact of Oceanic Oscillations in Annual Trends of Precipitation Extremes in the Paraíba do Sul River Basin Assessed Based on the PSL Daily Gridded Precipitation Dataset

Impact of Oceanic Oscillations in Annual Trends of Precipitation Extremes in the Paraíba do Sul River Basin Assessed Based on the PSL Daily Gridded Precipitation Dataset

Evolução Temporal das Variáveis Atmosféricas associadas a Casos de Frentes Frias Fortes em Cuiabá, MT, entre 1996 e 2015

Cold fronts responsible for intense winds in the Santos Basin, Brazilian Southeast Offshore Region

Contact Info

Product

Resources

About