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 14 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The South Atlantic Subtropical Anticyclone (SASA) directly in uences Southeastern Brazil year-round, favors slightly cloudy or clear skies (Dereczynski and Menezes 2017), and induces the northeast winds that predominate in the region (Franchito et When a frontal system passes through the region, the surface winds usually from the northeast direction, rotate anticlockwise to the southwest, and with the passage of the system, the winds continue the anticlockwise rotation, until return to the northeast (Stech and Lorenzzetti 1992; Dereczynski and Menezes 2017). On average, three frontal systems per month pass across Rio de Janeiro, and the frequency is reduced during the summer and autumn (Bonnet et al 2018). Mesoscale systems also in uence the region, such as the comma cloud, instability lines, and mesoscale convective systems (Dereczynski and Menezes 2017).…”

Section: Study Areamentioning

confidence: 99%

Operational wind forecast over the offshore Campos basin and adjacent coastal region in Brazil: support for the oil and gas industry toward renewable energy transition

Silva,

Dragaud,

Jacinto

et al. 2023

Preprint

View full text Add to dashboard Cite

In the context of the energy transition, the Campos Basin region is one of the most important and strategic areas in Brazil, given its relevance in oil and gas production, great wind resources, and proximity to the most populous region in the country. In this context the performance of a Numerical Weather Prediction (NWP) operational system based on the Weather Research and Forecasting model was evaluated, in addition to an investigation of the influence of physiographic aspects and meteorological systems on the near-surface wind regime. The numerical results of wind were evaluated in comparison to one year of observational data at onshore and offshore meteorological stations. Despite the well-known spin-up problem of NWP models, the best results were obtained in the first 24 hours. Consequently, the spin-up was less significant for model performance than the deviation from the initial conditions. Overall, the best results were obtained for the offshore rather than onshore region. The model was more assertive for the most frequent wind speed classes and had a worse performance for the extreme classes, overestimating the weakest winds and underestimating the strongest winds. A counterclockwise directional bias was also found overall, indicating overestimation (underestimation) of synoptic (local) forcing. From a seasonal perspective, the best results were obtained for the winter period, characterized by the greater influence of the South Atlantic Subtropical Anticyclone. The onshore winds revealed a pattern of clockwise rotation as one moves towards higher latitudes. One hypothesis is that this pattern is a consequence of the synergistic influence of orography, coastline shape, land-sea drag difference, and air-sea interaction phenomena. Finally, this study indicates that the NWP system is promising, proving to be an important tool for managing activities related to the current oil and gas industry in addition to subsidizing the expansion of wind energy exploration.

show abstract

Section: Study Areamentioning

confidence: 99%

Operational wind forecast over the offshore Campos basin and adjacent coastal region in Brazil: support for the oil and gas industry toward renewable energy transition

Silva,

Dragaud,

Jacinto

et al. 2023

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 14 publications

References 6 publications

Operational wind forecast over the offshore Campos basin and adjacent coastal region in Brazil: support for the oil and gas industry toward renewable energy transition

Operational wind forecast over the offshore Campos basin and adjacent coastal region in Brazil: support for the oil and gas industry toward renewable energy transition

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