Papers by Abdelmoula ben-tayeb
Air Quality, Atmosphere & Health, 2021
A decadal (2009–2018) seasonal cycles of aerosol optical depth measurements obtained by the AERON... more A decadal (2009–2018) seasonal cycles of aerosol optical depth measurements obtained by the AERONET network in Beijing show the variation in annual mean, in the interval (0.55–0.87), which represents a permanent high value above the air quality threshold defined by the WHO. The determined bi-log normal distributions are, in average, near to 0.19 µm and 3.2 µm respectively for fine and coarse modes with the great contribution of anthropogenic aerosol to urban areas in front of the influence of continental natural advections. Aerosol radiative forcing is relatively constant and registers as mean − 78.1 W/m2 at surface and − 32.55 W/m2 at the top of the atmosphere with a warming tendency of a corresponding forcing of atmospheric column around + 44.63 W/m2. Monitoring of atmospheric aerosols over the North China Plain region allows to estimating the impact of the air quality in Beijing on the health of the concerned population.
E3S Web of Conferences, 2021
Atmospheric aerosol is an important factor that affects solar irradiance. In this study, we exami... more Atmospheric aerosol is an important factor that affects solar irradiance. In this study, we examined the total atmospheric optical depth, aerosol optical depth AOD and the vertical particle size distribution in East Asia in terms of aerosol type during three years. The temporal variation of the aerosol optical depth for each site showed a constant mode renewed each year, the large AOD0,5 are recorded in spring and summer in an almost periodic manner, with maximums around 0.95 in Seoul, 0.08 in Chiang Mai and 1.34 in EPA-NCU. The particle size distributions under a bimodal lognormal form present a remarkable increase in volume concentration of fine and coarse modes during spring. The aerosols reduce solar irradiance by 37.33 ± 0.78% in Chiang Mai, 33.48 ± 6.43% in EPA-NCU and 38.59 ± 3.86% in Seoul.
Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition)
E3S Web of Conferences
Processing of the measurements obtained by the AERONET network of the optical parameters characte... more Processing of the measurements obtained by the AERONET network of the optical parameters characteristic of the atmospheric aerosol carried out makes it possible to compare the optical effects of 2020 volcanic eruptions to those results for 2019 concerning Mexico City and Mauna Loa site. Both the monthly spectral means of AOD and the monthly means of fine and coarse volume concentration show an increase for the months of January and February 2020 (Volcanic eruption period) compared to the same period in 2019 at Mexico City. Those corresponding to Mauna-Loa seem not sensible with very low values. The effects of ashes of the two-studied volcano are very different, led to a low increase in optical depth comparatively to the contribution of anthropogenic aerosol at MexicoCity (low continental spread) and led to a nonsignificate effect at Mauna-Loa (high marine spread).
Euro-Mediterranean Journal for Environmental Integration
Intense anthropogenic emissions over the Indian sub-continent lead to the formation of layers of ... more Intense anthropogenic emissions over the Indian sub-continent lead to the formation of layers of particulate pollution that can be transported to the high altitude regions of the Himalaya-Hindu-Kush (HKH). Aerosol particles contain a substantial fraction of strongly absorbing material, including black carbon (BC), organic compounds (OC), and dust all of which can contribute to atmospheric warming, in addition to greenhouse gases. Using a 3-year record of continuous measurements of aerosol optical properties, we present a time series of key climate relevant aerosol properties including the aerosol absorption (σ ap) and scattering (σ sp) coefficients as well as the single-scattering albedo (w 0). Results of this investigation show substantial seasonal variability of these properties, with long range transport during the pre-and post-monsoon seasons and efficient precipitation scavenging of aerosol particles during the monsoon season. The monthly averaged scattering coefficients range from 0.1 Mm −1 (monsoon) to 20 Mm −1 while the average absorption coefficients range from 0.5 Mm −1 to 3.5 Mm −1. Both have their maximum values during the premonsoon period (April) and reach a minimum during Monsoon (July-August). This leads to dry w 0 values from 0.86 (pre-monsoon) to 0.79 (monsoon) seasons. Significant diurnal variability due to valley wind circulation is also reported. Using aerosol optical depth (AOD) measurements,
Environmental Sciences, 2016
Air Quality, Atmosphere & Health
Air Quality, Atmosphere & Health
Environmental Sciences, 2016
Environmental Sciences, 2016
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Papers by Abdelmoula ben-tayeb