Air Quality Atmosphere & Health, Год журнала: 2024, Номер unknown
Опубликована: Июль 27, 2024
Язык: Английский
Air Quality Atmosphere & Health, Год журнала: 2023, Номер 17(2), С. 245 - 255
Опубликована: Сен. 28, 2023
Язык: Английский
Процитировано
1
Research Square (Research Square), Год журнала: 2024, Номер unknown
Опубликована: Фев. 20, 2024
Abstract This study investigates the temporal distribution of atmospheric particles over two mega-cities in Pakistan for period 2015–2023, offering an aerosol-type classification based on Particle Linear Depolarization Ratio (PLDR) and Single-Scattering Albedo (SSA) at 1020 nm, retrieved by AERONET (Aerosol Robotic Network) Version 3.0 Level 2.0 inversion products. Results reveal that Lahore has comparatively higher average values Aerosol Optical Depth (AOD 440nm) Ångstroṁ Exponent (AE 440-870nm) than Karachi. The contribution fine (coarse)--mode aerosols to total volume concentration dominates lower (higher) PLDR values. dust ratio (R d ) parameter indicated coarse-mode are dominated both sites with occurrence rates 86% Lahore, 99% Karachi, respectively. atmosphere city is mainly affected pure (PD), Karachi pollution-dominated mixture (PDM) 43.16% 49.14%, respectively, while dust-dominated (DDM) low-frequency (33.91% 29.63%, respectively). annual incidence dust-free pollution (NA, WA, SA, MA) (25.62% 27.87% Karachi) as compared dust-containing (28.47% 30.43% aerosol type. Weakly absorbing (WA) non-absorbing (NA) strong (SA) moderately (MA) aerosols. In addition, seasonally, winter season strongly PD (85.42%) DDM (54.39%), spring seasons WA (55.53%) PDM (68.61%), summer NA (Lahore: 64.94%, Karachi: 57.22%), autumn 51.56%, 49.46%) aerosols,
Язык: Английский
Процитировано
0
Research Square (Research Square), Год журнала: 2024, Номер unknown
Опубликована: Фев. 26, 2024
Abstract This study investigates the temporal distribution of atmospheric particles over two mega-cities in Pakistan for period 2015–2023, offering an aerosol-type classification based on Particle Linear Depolarization Ratio (PLDR) and Single-Scattering Albedo (SSA) at 1020 nm, retrieved by AERONET (Aerosol Robotic Network) Version 3.0 Level 2.0 inversion products. Results reveal that Lahore has comparatively higher average values Aerosol Optical Depth (AOD 440nm) Ångstroṁ Exponent (AE 440-870nm) than Karachi. The contribution fine (coarse)--mode aerosols to total volume concentration dominates lower (higher) PLDR values. dust ratio (R d ) parameter indicated coarse-mode are dominated both sites with occurrence rates 86% Lahore, 99% Karachi, respectively. atmosphere city is mainly affected pure (PD), Karachi pollution-dominated mixture (PDM) 43.16% 49.14%, respectively, while dust-dominated (DDM) low-frequency (33.91% 29.63%, respectively). annual incidence dust-free pollution (NA, WA, SA, MA) (25.62% 27.87% Karachi) as compared dust-containing (28.47% 30.43% aerosol type. Weakly absorbing (WA) non-absorbing (NA) strong (SA) moderately (MA) aerosols. In addition, seasonally, winter season strongly PD (85.42%) DDM (54.39%), spring seasons WA (55.53%) PDM (68.61%), summer NA (Lahore: 64.94%, Karachi: 57.22%), autumn 51.56%, 49.46%) aerosols,
Язык: Английский
Процитировано
0
Research Square (Research Square), Год журнала: 2024, Номер unknown
Опубликована: Фев. 28, 2024
Abstract In the Earth’s atmosphere, aerosols are one of most variable components that significantly impact Earth's climate and largely vary in their forms. This study investigates temporal distribution atmospheric particles over two mega-cities Pakistan for period 2015–2023, offering an aerosol-type classification based on Particle Linear Depolarization Ratio (PLDR) Single-Scattering Albedo (SSA) at 1020 nm, retrieved by AERONET (Aerosol Robotic Network) Version 3.0 Level 2.0 inversion products. Results reveal Lahore has comparatively higher average values Aerosol Optical Depth (AOD 440nm) Ångstroṁ Exponent (AE 440-870nm) than Karachi. The contribution fine (coarse) −mode to total volume concentration dominates lower (higher) PLDR values. dust ratio (R d ) parameter indicated coarse-mode dominated both sites with occurrence rates 86% Lahore, 99% Karachi, respectively. Pure (PD) have a frequency (43.16%) pollution-dominated mixture (PDM) (44.14%) atmosphere respectively, but dust-dominated (DDM) (33.91% 29.63%, respectively). Annual incidence dust-free pollution (SA, MA, WA, NA) (25.62% 27.87% Karachi) as compared dust-containing (28.47% 30.43% aerosol type. Weakly absorbing (WA) non-absorbing (NA) strong (SA) moderately (MA) aerosols. addition, seasonally, winter season is strongly affected PD (85.42%) DDM (54.39%), spring seasons WA (55.53%) PDM (68.61%), summer NA (Lahore: 64.94%, Karachi: 57.22%), autumn 51.56%, 49.46%) aerosols,
Язык: Английский
Процитировано
0
Research Square (Research Square), Год журнала: 2024, Номер unknown
Опубликована: Март 4, 2024
Abstract In the Earth’s atmosphere, aerosols are among most variable components that significantly impact Earth's climate and largely vary in their form. This study investigated temporal distribution of atmospheric particles over two megacities Pakistan for period 2015–2023, offering an aerosol-type classification based on Particle linear depolarization ratio (PLDR) Single-scattering albedo (SSA) at 1020 nm, retrieved from Aerosol Robotic Network (AERONET) Version 3.0 Level 2.0 inversion products. The results revealed Lahore had comparatively greater average values aerosol optical depth (AOD 440nm) Ångstroṁ exponent (AE 440nm-870nm) than did Karachi. contribution fine (coarse) −mode to total volume concentration dominates lower (higher) PLDRs. dust (R d ) parameter indicated coarse-mode were dominant both sites, with occurrence rates 86% 99% Pure (PD) have a frequency (43.16%) pollution-dominated mixture (PDM) (44.14%) atmospheres Karachi, respectively, but dust-dominated (DDM) has (33.91% 29.63%, respectively). annual incidence dust-free pollution (SA, MA, WA, NA) (25.62% Lahore, 27.87% Karachi) sites those dust-containing (28.47% 30.43% Karachi). Weakly absorbing (WA) Non-absorbing (NA) more strong (SA) moderately (MA) aerosols. addition, seasonally, winter season is strongly affected by PD (85.42%) DDM (54.39%), spring WA (55.53%) PDM (68.61%), summer NA (Lahore: 64.94%, Karachi: 57.22%), autumn 51.56%, 49.46%) aerosols,
Язык: Английский
Процитировано
0
Journal of Atmospheric and Solar-Terrestrial Physics, Год журнала: 2024, Номер 259, С. 106251 - 106251
Опубликована: Апрель 30, 2024
Язык: Английский
Процитировано
0
Air Quality Atmosphere & Health, Год журнала: 2024, Номер unknown
Опубликована: Июль 27, 2024
Язык: Английский
Процитировано
0