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Article

Global Spatial and Temporal Variation of the Combined Effect of Aerosol and Water Vapour on Solar Radiation

1
Department of Physics, University of Extremadura, 06006 Badajoz, Spain
2
Institute of Earth Sciences, Institute for Advanced Studies and Research, University of Évora, 7000-671 Évora, Portugal
3
Department of Physics, School of Sciences and Technology, University of Évora, 7000-671 Évora, Portugal
4
EaRSLab–Earth Remote Sensing Laboratory, University of Évora, 7000-671 Évora, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Eleni Marinou
Remote Sens. 2021, 13(4), 708; https://doi.org/10.3390/rs13040708
Received: 13 January 2021 / Revised: 9 February 2021 / Accepted: 12 February 2021 / Published: 15 February 2021
(This article belongs to the Special Issue Remote Sensing of Cloud and Aerosol Effects on Solar Radiation)
This study aims to calculate the combined and individual effects of the optical thickness of aerosols (AOT) and precipitable water vapour (PWV) on the solar radiation reaching the Earth’s surface at a global scale and to analyse its spatial and temporal variation. For that purpose, a novel but validated methodology is applied to CERES SYN1deg products for the period 2000–2019. Spatial distributions of AOT and PWV effects, both individually and combined, show a close link with the spatial distributions of AOT and PWV. The spatially averaged combined effect results in a −13.9% reduction in irradiance, while the average AOT effect is −2.3%, and the PWV effect is −12.1%. The temporal analysis focuses on detecting trends in the anomalies. The results show overall positive trends for AOT and PWV. Consequently, significant negative overall trends are found for the effects. However, significant positive trends for the individual AOT and the combined AOT-PWV effects are found in specific regions, such as the eastern United States, Europe or Asia, indicating successful emission control policies in these areas. This study contributes to a better understanding of the individual and combined effects of aerosols and water vapour on solar radiation at a global scale. View Full-Text
Keywords: global radiative effects; aerosol optical depth; precipitable water vapour; combined effects; CERES global radiative effects; aerosol optical depth; precipitable water vapour; combined effects; CERES
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MDPI and ACS Style

Obregón, M.Á.; Serrano, A.; Costa, M.J.; Silva, A.M. Global Spatial and Temporal Variation of the Combined Effect of Aerosol and Water Vapour on Solar Radiation. Remote Sens. 2021, 13, 708. https://doi.org/10.3390/rs13040708

AMA Style

Obregón MÁ, Serrano A, Costa MJ, Silva AM. Global Spatial and Temporal Variation of the Combined Effect of Aerosol and Water Vapour on Solar Radiation. Remote Sensing. 2021; 13(4):708. https://doi.org/10.3390/rs13040708

Chicago/Turabian Style

Obregón, María Á., Antonio Serrano, Maria J. Costa, and Ana M. Silva 2021. "Global Spatial and Temporal Variation of the Combined Effect of Aerosol and Water Vapour on Solar Radiation" Remote Sensing 13, no. 4: 708. https://doi.org/10.3390/rs13040708

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