Variabilidade Temporal da Radiação Solar Durante o Experimento GOAmazon 2014/15

Abstract

ResumoO presente trabalho estudou a variabilidade temporal das 3 componentes da irradiância solar (global, direta e difusa) na região de Manacapuru, distante 66 km de Manaus-AM, dentro do âmbito do projeto GOAmazon 2014/15, analisando dados relativos aos anos de 2014 e 2015. Também foram analisados dados de cobertura de nuvens e precipitação do mesmo período. Observou-se, de modo geral, que os valores das frações de nuvens foram semelhantes entre os dois anos analisados, situando-se entre valores típicos de 20-25% (estação seca) e 35-40% (estação chuvosa). São apresentados valores típicos das irradiâncias solar global, direta e difusa para diferentes escalas de tempo (horárias e sazonal), bem como as variações destes valores entre os anos 2014-2015 (escala interanual). São também apresentados as interrelações destas 3 componentes para os valores médios horários e mensais e observa-se que as irradiâncias solar global e direta são diretamente relacionadas entre si e inversamente relacionadas com a contribuição difusa. Finalizando, é discutido como o evento EN 2015 impactou as medidas das 3 componentes da irradiância solar a superfície, associando com a menor ocorrência de nuvens/chuva e da presença maior de aerossóis. Palavras-chave: global, difusa, direta, cobertura de nuvens, medida direta. Temporal Variability of Solar Radiation During the GOAmazon 2014/15 Experiment AbstractThe present work studied the temporal variability of the three components of solar irradiation (global, direct and diffuse) at the Manacapuru region, 66 km distant from Manaus-AM, within the scope of the GOAmazon 2014/15 project, analyzing data for the years of 2014 and 2015. Also it was analyzed the cloud cover data and precipitation. In general, the cloud cover for both years were similar and their typical values are 20-25% (dry season) and 35-40% (wet period). The typical values of global, direct and diffuse solar irradiance were presented for different time scale (hourly and seasonal) as well as variations for the years 2014 and 2015 (interannual scale). The interrelationships amongst the 3 components for hourly and monthly values were presented and it can be noticed that global and direct solar irradiances were directly related although both were inversely correlated with the diffuse solar irradiance. Finally, the ENSO 2015 event was discussed and how it was impacted, the measurements as it had lower cloud cover and rain the higher aerosol concentration.

Observational analysis of the daily cycle of the planetary boundary layer in the central Amazon during a non-El Niño year and El Niño year (GoAmazon project 2014/5)

“…In this region there is a substantial quantity of convective activity that occurs during the entire year, but there are significant seasonal differences due to annual variation in atmospheric circulation and thermodynamic structure (Marengo and Espinoza, 2016), and these wet (or rainy) and dry seasons are well-defined. In this context, during the years 2014 and 2015, in the central Amazon region, the Green Ocean Amazon (GoAmazon) project was conducted with the objective of observing the influence of the complex interaction between the pollution plume generated in the city of Manaus-Amazonas and clouds and vegetation (Martin et al, 2016).…”

Interaction between cloud-radiation, atmospheric dynamics and thermodynamics based on observational data from GoAmazon 2014/15 and a Cloud Resolving Model

“…1). The experiment´s focus was to study the interaction between vegetation-atmosphere, atmospheric chemistry, aerosol production, clouds, radiation and precipitation, with the aim of understanding and quantifying these interconnected processes (Macedo and Fisch, 2018;Machado et al, 2018;Martin et al, 2016).…”

Nocturnal Boundary Layer Erosion Analysis in the Amazon Using Large-Eddy Simulation during GoAmazon Project 2014/5

“…However, the higher values observed in this IOP were more intense than the same period for 2014, being in the range between 10 and 13 LT of approximately 280.0 W m −2 , and with a height of 1500 m (top of CBL). This resulted in greater conversion of net radiation into sensible heat fluxes, which means that more energy was available during the 2015 dry season compared to 2014, a common feature in years with ENSO events [52]. For 2015, the entrainment zone (negative maximum flux) was −80.0 W m −2 for IOP 3 (lasting from 11 up to 13 LT) and −30.0 W m −2 for IOP 4 (between 10 and 13 LT).…”