Relação Entre Profundidade Óptica Do Aerossol E Precipitação  Tendo a Umidade Relativa Como Fator De Influência

Souza, Amaury de; Cavazzana, Guilherme Henrique; Santos, Débora Aparecida da Silva; Abreu, Marcel Carvalho; Fernandes, Widinei Alves; Aristone, Flávio

doi:10.22409/geographia2021.v23i51.a27224

Cited by 3 publications

(2 citation statements)

References 50 publications

(60 reference statements)

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“…According to Sousa et al [50], it is plausible to infer that El Niño exerts a substantial influence on subsequent precipitation rates in specific areas of the Amazon region. This observation aligns with the analysis by Souza et al [51], who, through statistical analysis, demonstrate a statistically significant relationship between atmospheric aerosols and precipitation.…”

Section: Specific Humidity Assessmentsupporting

confidence: 92%

Relationship between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

Pereira,

Palácios,

Santos

et al. 2024

Climate

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The El Niño-Southern Oscillation (ENSO) stands out as the most significant tropical phenomenon in terms of climatic magnitude resulting from ocean–atmosphere interaction. Due to its atmospheric teleconnection mechanism, ENSO influences various environmental variables across distinct atmospheric scales, potentially impacting the spatiotemporal distribution of atmospheric aerosols. Within this context, this study aims to evaluate the relationship between ENSO and atmospheric aerosols across the entire Legal Amazon during the period from 2006 to 2011. Over this five-year span, four ENSO events were identified. Concurrently, an analysis of the spatiotemporal variability of aerosol optical depth (AOD) and Black Carbon radiation extinction (EAOD-BC) was conducted alongside these ENSO events, utilizing data derived from the Aerosol Robotic Network (AERONET), MERRA-2 model, and ERSSTV5. Employing the Windowed Cross-Correlation (WCC) approach, statistically significant phase lags of up to 4 to 6 months between ENSO indicators and atmospheric aerosols were observed. There was an approximate 100% increase in AOD immediately after El Niño periods, particularly during intervals encompassing the La Niña phase. The analysis of specific humidity anomaly (QA) revealed that, contrary to expectations, positive values were observed throughout most of the El Niño period. This result suggests that while there is a suppression of precipitation events during El Niño due to the subsidence of drier air masses in the Amazon, the region still exhibits positive specific humidity (Q) conditions. The interaction between aerosols and humidity is intricate. However, Q can exert influence over the microphysical and optical properties of aerosols, in addition to affecting their chemical composition and aerosol load. This influence primarily occurs through water absorption, leading to substantial alterations in radiation scattering characteristics, and thus affecting the extinction of solar radiation.

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Section: Specific Humidity Assessmentsupporting

confidence: 92%

Relationship between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

Pereira,

Palácios,

Santos

et al. 2024

Climate

View full text Add to dashboard Cite

show abstract

“…According to Sousa et al [45], it is plausible to infer that El Niño exerts a substantial influence on subsequent precipitation rates in specific areas of the Amazon region. This observation aligns with the analysis by Souza et al [46], who, through statistical analysis, demonstrate a statistically significant relationship between atmospheric aerosols and precipitation.…”

Section: Specific Humidity Assessmentsupporting

confidence: 92%

Relationship Between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

Pereira,

Palácios,

Santos

et al. 2023

Preprint

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The El Niño-Southern Oscillation (ENSO) stands as the paramount tropical phenomenon of climatic magnitude resulting from ocean-atmosphere interaction. Due to its atmospheric teleconnection mechanism, ENSO wields influence over diverse environmental variables spanning distinct atmospheric scales, thereby potentially impacting the spatiotemporal distribution of atmospheric aerosols. Within this framework, this study aims to appraise the relationship between ENSO and atmospheric aerosols across the Legal Amazon during the period between 2006 and 2011. Over this quinquennium, four ENSO events were identified. Concurrently, an analysis was conducted on the spatiotemporal variability of aerosol optical depth (AOD) and AOD extinction for Black Carbon (EAOD-BC), concomitant with said ENSO events, utilizing data derived from the Aerosol Robotic Network (AERONET), MERRA-2 model, and ERSSTV5. Through the Windowed Cross Correlation (WCC) approach, statistically significant phase lags of up to 4 to 6 months were observed between ENSO indicators and atmospheric aerosols. Moreover, conspicuous increases of over 100% in atmospheric aerosol concentration were evidenced subsequent to El Niño periods, especially during the intervals encompassing the La Niña phase, particularly within the La Niña CP (Central Pacific)/Modoki category. By analyzing specific humidity anomalies (QA), exceptional scenarios in the region were detectable. This observation suggests a notable singularity when juxtaposed with antecedent investigations and typical average patterns characterizing the impacts on the Amazonian region.

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Relação Entre Os Indicadores Do Enos E Os Aerossóis Atmosféricos Em Um Site Da Amazônia

Pereira¹,

Barros²,

Palácios³

2023

Rev. Foco

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O El Niño Oscilação Sul (ENOS) é um fenômeno do acoplamento oceano-atmosfera de escala climática que se manifesta em fases positivas (El Niño) e negativas (La Niña) no Oceano Pacífico, com influência através de teleconexões atmosféricas que alteram os padrões dos elementos meteorológicos globalmente. Na Amazônia, possivelmente mudanças provocadas pelo ENOS em suas diferentes fases alteram a distribuição espaço-temporal dos aerossóis atmosféricos. Nesse sentido o objetivo desse estudo foi avaliar a relação entre os indicadores de ENOS e os aerossóis atmosféricos em um site da Amazônia, entre o período de 2000 a 2017. Utilizou-se a análise de correlação cruzada (CC), que indica as relações temporais defasadas. Os resultados obtidos revelaram uma significância estatística entre os indicadores do ENOS e as estimativas de profundidade ótica do aerossol (AOD). Notou-se uma considerável semelhança entre as regiões Niño 3, 3.4 e 4 em relação à AOD, principalmente no que diz respeito à periodicidade. Entretanto, destaca-se uma notável discrepância entre os resultados obtidos para os indicadores Niño 1+2 e IOS em relação à AOD, especialmente nas defasagens entre -4 e 4.

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Relação Entre Profundidade Óptica Do Aerossol E Precipitação Tendo a Umidade Relativa Como Fator De Influência

Cited by 3 publications

References 50 publications

Relationship between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

Relationship between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

Relationship Between El Niño-Southern Oscillation and Atmospheric Aerosols in the Legal Amazon

Relação Entre Os Indicadores Do Enos E Os Aerossóis Atmosféricos Em Um Site Da Amazônia

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