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Global trends in the aerosol optical, physical, and morphological properties obtained using multi-sensor measurements
https://orcid.org/0000-0001-9317-8227
https://orcid.org/0000-0002-3882-2523
https://orcid.org/0000-0001-8782-9249
Abstract Numerous studies have been carried out to examine the trends in the rapidly changing aerosol loading through the total Aerosol Optical Depth (AOD) but very few investigations have acknowledged its long-term implications through the combined optical, physical, and morphological properties of the aerosols. Using a multivariate linear regression trend analysis model on nearly two decades (i.e., 2001–2020) of multi-source global datasets, we tried to relate the contribution of each of the varying aerosol properties such as scattering, absorption, size, and shape, to the changing total AOD trends of that sensor. Region-wise analysis has shown that the decrease (increase) in the total AOD trends observed over North-Eastern America, South America, Europe, North-Western Africa, and Eastern and Central China (Indian) regions are mainly in connection with the decrease (increase) in the fine-mode and scattering aerosols. However, the major increase over the South African region is from the increase in absorbing and scattering aerosols. Interestingly, the Indo-Gangetic Plain region of India, where high total AOD trends are observed, has seen a plausible slight decrease in its absorbing, non-spherical, and coarse-mode aerosols in recent years. This study also details the region-wise response accompanying the implementation of stringent mitigation strategies to ensure accurate quantification of the changing aerosol patterns in the atmosphere.
Graphical abstract The aerosol properties contributing to the estimation of aerosol optical depth are shown in the left panel. The right panel shows the region-wise distribution of the columnar trends in the total (black), fine-mode (red), coarse-mode (dark blue), absorbing (green), scattering (turquoise), and non-spherical (yellow) AOD. Here, the upward arrow represents increasing trend whereas downward arrow represents decreasing trend. The length of the arrows is decided based on the increasing/decreasing trend values which are above/below 0.03/decade (being the most frequent trend value in this study). Display Omitted
Highlights Trends in aerosol Scattering, Absorption, Size, and Shape is delineated globally. Multi-regression analysis is used for obtained trends unlike conventional linear trends. Contribution of each of the varying aerosol properties to the total trends is provided. Region-wise response to the implementation of mitigation strategies is outlined. Developing regions can also call for similar kinds of mitigation strategies.
Global trends in the aerosol optical, physical, and morphological properties obtained using multi-sensor measurements
https://orcid.org/0000-0001-9317-8227
https://orcid.org/0000-0002-3882-2523
https://orcid.org/0000-0001-8782-9249
Abstract Numerous studies have been carried out to examine the trends in the rapidly changing aerosol loading through the total Aerosol Optical Depth (AOD) but very few investigations have acknowledged its long-term implications through the combined optical, physical, and morphological properties of the aerosols. Using a multivariate linear regression trend analysis model on nearly two decades (i.e., 2001–2020) of multi-source global datasets, we tried to relate the contribution of each of the varying aerosol properties such as scattering, absorption, size, and shape, to the changing total AOD trends of that sensor. Region-wise analysis has shown that the decrease (increase) in the total AOD trends observed over North-Eastern America, South America, Europe, North-Western Africa, and Eastern and Central China (Indian) regions are mainly in connection with the decrease (increase) in the fine-mode and scattering aerosols. However, the major increase over the South African region is from the increase in absorbing and scattering aerosols. Interestingly, the Indo-Gangetic Plain region of India, where high total AOD trends are observed, has seen a plausible slight decrease in its absorbing, non-spherical, and coarse-mode aerosols in recent years. This study also details the region-wise response accompanying the implementation of stringent mitigation strategies to ensure accurate quantification of the changing aerosol patterns in the atmosphere.
Graphical abstract The aerosol properties contributing to the estimation of aerosol optical depth are shown in the left panel. The right panel shows the region-wise distribution of the columnar trends in the total (black), fine-mode (red), coarse-mode (dark blue), absorbing (green), scattering (turquoise), and non-spherical (yellow) AOD. Here, the upward arrow represents increasing trend whereas downward arrow represents decreasing trend. The length of the arrows is decided based on the increasing/decreasing trend values which are above/below 0.03/decade (being the most frequent trend value in this study). Display Omitted
Highlights Trends in aerosol Scattering, Absorption, Size, and Shape is delineated globally. Multi-regression analysis is used for obtained trends unlike conventional linear trends. Contribution of each of the varying aerosol properties to the total trends is provided. Region-wise response to the implementation of mitigation strategies is outlined. Developing regions can also call for similar kinds of mitigation strategies.
Global trends in the aerosol optical, physical, and morphological properties obtained using multi-sensor measurements
https://orcid.org/0000-0001-9317-8227
https://orcid.org/0000-0002-3882-2523
https://orcid.org/0000-0001-8782-9249
Abstract Numerous studies have been carried out to examine the trends in the rapidly changing aerosol loading through the total Aerosol Optical Depth (AOD) but very few investigations have acknowledged its long-term implications through the combined optical, physical, and morphological properties of the aerosols. Using a multivariate linear regression trend analysis model on nearly two decades (i.e., 2001–2020) of multi-source global datasets, we tried to relate the contribution of each of the varying aerosol properties such as scattering, absorption, size, and shape, to the changing total AOD trends of that sensor. Region-wise analysis has shown that the decrease (increase) in the total AOD trends observed over North-Eastern America, South America, Europe, North-Western Africa, and Eastern and Central China (Indian) regions are mainly in connection with the decrease (increase) in the fine-mode and scattering aerosols. However, the major increase over the South African region is from the increase in absorbing and scattering aerosols. Interestingly, the Indo-Gangetic Plain region of India, where high total AOD trends are observed, has seen a plausible slight decrease in its absorbing, non-spherical, and coarse-mode aerosols in recent years. This study also details the region-wise response accompanying the implementation of stringent mitigation strategies to ensure accurate quantification of the changing aerosol patterns in the atmosphere.
Graphical abstract The aerosol properties contributing to the estimation of aerosol optical depth are shown in the left panel. The right panel shows the region-wise distribution of the columnar trends in the total (black), fine-mode (red), coarse-mode (dark blue), absorbing (green), scattering (turquoise), and non-spherical (yellow) AOD. Here, the upward arrow represents increasing trend whereas downward arrow represents decreasing trend. The length of the arrows is decided based on the increasing/decreasing trend values which are above/below 0.03/decade (being the most frequent trend value in this study). Display Omitted
Highlights Trends in aerosol Scattering, Absorption, Size, and Shape is delineated globally. Multi-regression analysis is used for obtained trends unlike conventional linear trends. Contribution of each of the varying aerosol properties to the total trends is provided. Region-wise response to the implementation of mitigation strategies is outlined. Developing regions can also call for similar kinds of mitigation strategies.
Global trends in the aerosol optical, physical, and morphological properties obtained using multi-sensor measurements
Gupta, Gopika (author) / Venkat Ratnam, M. (author) / Madhavan, B.L. (author) / Jayaraman, A. (author)
Atmospheric Environment ; 295
2022-12-24
Article (Journal)
Electronic Resource
English
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