Impacto do Gelo Marinho Antártico, do ENOS e do Modo Anular Sul sobre as Frentes Frias na América do Sul

Caldas, Catharine Freire de; Vasconcellos, Fernanda Cerqueira; Cavalcanti, Iracema Fonseca de Albuquerque; Carvalho, Natasha Oliveira de; Lopes, Italo dos Reis

doi:10.11137/2020_4_229_237

Cited by 1 publication

(2 citation statements)

References 12 publications

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“…When the convection is strong in Indonesia, it reduces in the east of Brazil and vice versa. Caldas et al (2020) also verified that a combination of different SAM, El Niño Southern Oscillation (ENSO) phases, and Antarctic sea ice anomalies in Bellingshausen-Amundsen (BAS) and Weddel (WDS) seas influence the cold fronts tracks over South America. In the Santos Basin region, the maximum frequencies occurred for negative SAM, El Niño, and minimum sea ice extension in BAS combination and positive SAM, La Niña, and maximum sea ice extension in WDS combination (Caldas et al, 2020).…”

Section: Introductionmentioning

confidence: 55%

“…Caldas et al (2020) also verified that a combination of different SAM, El Niño Southern Oscillation (ENSO) phases, and Antarctic sea ice anomalies in Bellingshausen-Amundsen (BAS) and Weddel (WDS) seas influence the cold fronts tracks over South America. In the Santos Basin region, the maximum frequencies occurred for negative SAM, El Niño, and minimum sea ice extension in BAS combination and positive SAM, La Niña, and maximum sea ice extension in WDS combination (Caldas et al, 2020). This work aims to identify the characteristics of the cold fronts responsible for generating intense winds (INTW) cases in the Santos Basin by comparing them with moderate winds (MODW) cases.…”

Section: Introductionmentioning

confidence: 55%

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

Magalhães

Vasconcellos

Dereczynski

et al. 2023

Atm.

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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.

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Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 55%