Anticiclone Subtropical do Atlântico Sul Associado ao Modo Anular Sul e Impactos Climáticos no Brasil

Carpenedo, Camila Bertoletti; Ambrizzi, Tércio

doi:10.1590/0102-77863540066

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…Among the localities analyzed, the Santa Branca region deserves to be highlighted, as it presents statistical signi cance with a negative CWD trend of 0.6 days/year. This reduction in CWD can also be related to the southwestward expansion of SASA found in many studies (Reboita et al, 2019;Carpenedo and Ambrizzi, 2020;Marengo et al, 2020).…”

Section: Spatial Distribution Of Rainfall Trendsmentioning

confidence: 68%

“…That is, when it is in the positive phase, it has negative (positive) geopotential height anomalies in the high (medium) southern latitudes, associated with the anomalous displacement of the SASA and ITCZ to the south. The opposite occurs during the negative phase of the SAM (Sun et al, 2017;Carpenedo and Ambrizzi, 2020).…”

Section: Spatial Distribution Of Rainfall Trendsmentioning

confidence: 96%

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A teleconnection study between oceanic oscillations and trends in precipitation extremes in the Paraíba do Sul River Basin

Senna

França

Pereira

et al. 2023

Theor Appl Climatol

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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, Paci c 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 ve 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 ve 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 signi cant power at the low frequencies.

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Section: Spatial Distribution Of Rainfall Trendsmentioning

confidence: 68%

Section: Spatial Distribution Of Rainfall Trendsmentioning

confidence: 96%

A teleconnection study between oceanic oscillations and trends in precipitation extremes in the Paraíba do Sul River Basin

Senna

França

Pereira

et al. 2023

Theor Appl Climatol

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“…Excessive precipitation over Southeastern Brazil is associated with the positive phase of SAM (Vasconcellos & Cavalcanti 2010, Vasconcellos et al 2019, which is related to positive extremes of ASI (Pezza et al 2012, Parise et al 2015. In the positive phase of SAM (i.e., positive anomalies of mean sea level pressure in mid-latitudes), SASH tends to be positioned further south (Sun et al 2017, Carpenedo & Ambrizzi 2020, influencing the strengthening of trade winds in some areas at south of northeast region of Brazil (Carpenedo & Ambrizzi 2020). Oppositely, in the negative phase of SAM, the SASH tends to be positioned further north, generating negative anomalies of precipitation in the north and northeast regions (Carpenedo & Ambrizzi 2020).…”

Section: Discussionmentioning

confidence: 99%

Sensitivity of South America Climate to Positive Extremes of Antarctic Sea Ice

Parise

Pezzi

Carpenedo

et al. 2022

An. Acad. Bras. Ciênc.

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Global climate change is expected to increasingly affect climate-sensitive sectors of society, such as the economy and environment, with signifi cant impacts on water, energy, agriculture and fi sheries. This is the case in South America, whose economy is highly dependent on the agricultural sector. Here, we analyzed the sensitivity of South American climate to positive extremes of Antarctic sea ice (ASI) extent and volume at continental and regional scales. Sensitivity ensemble experiments were conducted with the GFDL-CM2.1 model and compared with the ERA-Interim reanalysis dataset.The results have shown signifi cant impacts on the seasonal regime of precipitation, air temperature and humidity in South America, such as a gradual establishment of the South Atlantic Convergence Zone, the formation of the Upper Tropospheric Cyclonic Vortex, the strengthening of Bolivian High and the presence of a low level cyclonic circulation anomaly over the South Atlantic Subtropical High region which contributed, for instance, to increased precipitation over the Southeastern Brazil. A northward shift of the Intertropical Convergence Zone was initially also a response pattern to the increased ASI. Moreover, the greatest variance of the climatic signal generated from the disturbances applied on the high southern latitudes has occurred in the interseasonal timescale (110-120 days), especially over the Brazilian Amazon and the Southeastern Brazil regions.

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“…Consequently, there is a precipitation deficit in the Central-Southern region of Brazil (except in autumn) and a strengthening of winds in specific areas of the South of the country, such as Santa Catarina. 27 The SAM affects precipitation distribution and intensity, temperature patterns, and even the occurrence of extreme events across various parts of the Southern Hemisphere, influencing fresh water availability, aquifer recharge, and surface runoff patterns in specific regions. According to Pizzochero et al, 28 during the negative phase of SAM, there is a predominance of negative temperature anomalies across much of Brazil, indicating lower than normal temperatures, except from the coast of Bahia to Santa Catarina, where there is a regional variation in the influence of this phenomenon.…”

Section: Intraseasonal Scale Systemsmentioning

confidence: 99%

Identification of active meteorological systems in Santa Catarina with potential socioeconomic impact

Pugas,

Vitor,

de Quadro

2024

IJH

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The article aims to comprehensively identify and analyze the meteorological systems operating in the State of Santa Catarina, Brazil, shedding light on their characteristics, scales of action, and associated impacts, particularly regarding socioeconomic impacts on society. Utilizing a bibliographic review, the study synthesizes knowledge about these systems, including their characteristics and scales. A total of 62 manuscripts were analyzed, revealing the complexity of climatic phenomena from interdecadal scales to mesoscales. It covers the Pacific Decadal Oscillation and El Niño, the Madden-Julian Oscillation, and the Antarctic Oscillation (Southern Annular Mode - SAM), cyclones, the South Atlantic Convergence Zone (SACZ), the South Atlantic Subtropical Anticyclone (South Atlantic High - SAH) and the South Pacific Subtropical Anticyclone (South Pacific High - SPH), Upper Tropospheric Cyclonic Vortex (UTCV), Weather Systems, and Jet Streams (both Upper-Level and Low-Level Jets), Mesoscale Convective Complexes, and Squall Lines. Although microscale phenomena were not specifically identified in the research, they represent a highly active scale of meteorological phenomena essential for understanding the fine interactions that affect the local climate, highlighting the impact of geographical characteristics and specific microclimatic variations in Santa Catarina. Integrating these scales of analysis and identifying the active systems in the State can contribute to the needs of various segments, especially those employing a holistic approach in meteorology, aiming for a better understanding and prediction of meteorological systems.

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Anticiclone Subtropical do Atlântico Sul Associado ao Modo Anular Sul e Impactos Climáticos no Brasil

Cited by 10 publications

References 33 publications

A teleconnection study between oceanic oscillations and trends in precipitation extremes in the Paraíba do Sul River Basin

A teleconnection study between oceanic oscillations and trends in precipitation extremes in the Paraíba do Sul River Basin

Sensitivity of South America Climate to Positive Extremes of Antarctic Sea Ice

Identification of active meteorological systems in Santa Catarina with potential socioeconomic impact

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