Ciclos climáticos e causas naturais das mudanças do clima

Oliveira, Marcos José de; Carneiro, Celso Dal Ré; Vecchia, Francisco Arthur da Silva; Baptista, Gustavo Macêdo de Mello

doi:10.20396/td.v13i3.8650958

Cited by 21 publications

(15 citation statements)

References 121 publications

(98 reference statements)

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“…For this reason, they are used as a geochronological reference in cyclostratigraphic research (see item "High-resolution Sequence Stratigraphy"). Astronomical cycles are multiple and periodic events (simple or compound) that range from Earth's rotation, recorded in tidal deposits (tidal bundles), to the oscillation and revolution cycles of the Solar System in the galaxy, which also impress a recognizable sign in the geological record (House 1995, Hinnov 2013, Oliveira et al 2017Fig. 14).…”

Section: Climatementioning

confidence: 99%

Cyclicity and hierarchy in sequence stratigraphy: an integrated approach

et al. 2021

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With standardized methodology and nomenclature, the sequence stratigraphy aims to characterize multi-scale cyclical units of genetically related rocks into a hierarchical chronostratigraphic framework. From facies to basin scale, the stacking patterns and stratigraphic surfaces are recognized as sequence elements. In parallel, Earth sciences have developed a sophisticated understanding of geological processes (tectonic, climatic, and eustatic) that produce the main cyclicity observed in the sedimentary rock record. This review paper discusses how the elaboration of hierarchical stratigraphic frameworks that incorporate the knowledge of these periodic geological processes -from high-to low-frequencies -as the control of generation and preservation of sequences -from high-to low-resolutions -guarantees objective results in predicting vertical recurrence and the lateral correlation of genetic stratigraphic units. This interpretive approach of cyclic stratigraphic analysis supports the development of effective observable criteria to identify and rank sequences in multiple scales, based on cycle anatomy, recurrence, vertical trends, and mappability. This methodological improvement reduces the inaccuracies and contradictions of traditional conceptual models based on fully preserved three-dimensional depositional systems.

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Section: Climatementioning

confidence: 99%

Cyclicity and hierarchy in sequence stratigraphy: an integrated approach

et al. 2021

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“…O aquecimento global é uma possibilidade aberta pelas cíclicas mudanças do clima terrestre. Quando se fala em mudança climática é indispensável envolver o fator tempo, pois as alterações resultam da interação continuada de fatores naturais ou antrópicos que modificam os componentes do balanço de radiação terrestre, ao longo de escalas de tempo da ordem de séculos, milênios ou até mesmo milhões de anos (Oliveira, Vecchia & Carneiro, 2017). Os padrões mundiais de clima são determinados por conjuntos de fatores astronômicos, geológicos e atmosféricos.…”

Section: Mudança Climáticaunclassified

Comunicação pública da ciência diante das coalizões em conflito sobre aquecimento global

et al. 2021

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A formulação de políticas públicas de sustentabilidade apoia-se de maneira decisiva na comunicação pública da Ciência. Aplicando o modelo da Advocacy Coalition Framework (ACF) os autores deste artigo buscam iluminar as disputas sobre a questão do aquecimento global antropogênico e a controvérsia existente. Distintas coalizões em torno do tema “mudança climática” participam decisivamente das disputas e do conflito. Contudo, existem manipulações polêmicas e irresponsáveis, além de desleais, formadas sobretudo por fake news, que fragilizam a postura dos cidadãos e impedem a formação de uma consciência crítica sobre esse e outros temas polêmicos. Conclui-se que certos discursos frágeis, respaldados em notícias falsas, geram prejuízos à sociedade, ao meio ambiente e à própria qualidade da democracia.

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“…According to data available from National Oceanic and Atmospheric Administration (NOAA 5 ), these years are characterized by the occurrence of the El Niño-Southern Oscillation (ENSO) phenomenon, which is defined as the main source of interannual variability in scales of a few years, which represents global impacts as well (Trenberth, 1997;Almeida et al, 2017;Oliveira et al, 2017).…”

Section: Spatial Variability Analysismentioning

confidence: 99%

Spatiotemporal Variability of Longshore Sediment Transport on the Brazilian Coast

Trombetta¹,

Marques²

2020

Preprint

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The lack of planning and management regarding the transport of sediments along the coast can alter the existing equilibrium in coastal regions, causing or accelerating erosive processes and resulting in economic and environmental damage. Thus, it is important that the characteristics of the coastal drift be investigated, serving as source of information for future projects involving the coastal environment management. Within this context, the present work aims to identify the annual sediment transport averages along the Brazilian coast, the dominant direction of the coastal drift and its spatial variability. For this, a wind-generated wave modeling was considered, with 37 years of data (1979 to 2015), as well as four sediment transport formulations. For the spatiotemporal variability, the analysis of wavelets was applied, relating the effect of cycles of variability over the behavior of longshore sediment transport. The results showed that the largest annual volumes of sediment transport occurred in the northeastern Region of Brazil, reaching approximately 850000 m3/year-1. On the other hand, the smallest transport averages occurred in the southern region, in the state of Santa Catarina, reaching the value of 13497 m3/year-1. In the northeast region, annual and interannual cycles were more frequent and more energetic than in the southern Region, where short cycles presented similar importance to longer cycles, during 37 years of the study. However, in the overall context of the analysis, the long period cycles are more significant for longshore sediment transport, since this is a long term process. In this way, the present article contributes with information on longshore sediment transport, highlighting the annual means and the dominant drift, and deals with important questions about the influence of cycles of variability in the study region, emphasizing the importance of longer period events for the control of sedimentary transport in the Brazilian coast.

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Ciclos climáticos e causas naturais das mudanças do clima

Cited by 21 publications

References 121 publications

Cyclicity and hierarchy in sequence stratigraphy: an integrated approach

Cyclicity and hierarchy in sequence stratigraphy: an integrated approach

Comunicação pública da ciência diante das coalizões em conflito sobre aquecimento global

Spatiotemporal Variability of Longshore Sediment Transport on the Brazilian Coast

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