Particle optical properties at a Central Mediterranean site: Impact of advection routes and local meteorology

Perrone, M. R.; Romano, Salvatore; Orza, J.A.G.

doi:10.1016/j.atmosres.2014.03.029

Cited by 36 publications

(43 citation statements)

References 32 publications

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“…They found that both seasonal and daily cycles of the scattering and backscattering coefficients were related to the local production and transport of particles from elsewhere. Multi-wavelength nephelometer measurements performed at a coastal site of southeastern Italy, from December 2011 to November 2012, were reported by Perrone et al [6]. They also found that the σ p and β p values and their respective dependence on wavelength were strongly dependent on airflows.…”

Section: Introductionmentioning

confidence: 60%

“…Scattering coefficients depend on the number concentration, the size, the shape, and the absorption of the sampled particles. The changes of the synoptic and local meteorological conditions, which affect the optical and microphysical properties of particles, also have a large impact on the p daily cycle and variability [1,6], in addition to the particle's source changes. The grey line on Figure 5a shows the time evolution of the two houraveraged scattering Å ngström coefficient values with corresponding SEMs.…”

Section: Radiative Fluxes and Particle Scattering Coefficients From 4mentioning

confidence: 99%

“…Atmosphere 2015, 6,[1889][1890][1891][1892][1893][1894][1895][1896][1897][1898][1899][1900][1901][1902][1903] the re-suspension of road dust (large particles) into the air on the diurnal traffic rush hours, could also contributed to the å decrease around midday as mentioned in some studies. It has also been shown that the night-time low values of the SW and LW irradiance favored the accumulation of particles at the surface.…”

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confidence: 99%

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Irradiance Impact on Pollution by Integrating Nephelometer Measurements

Perrone¹,

Burlizzi²,

Romano³

2015

Atmosphere

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Three-wavelength integrating nephelometer measurements combined with short-(SW) and long-wave (LW) irradiance measurements were used to investigate the irradiance effects on the daily evolution of the particulate matter (PM) at the ground level, and contribute to the characterization of the land-atmosphere interaction in pollution dispersal. The integrating nephelometer measurements have allowed characterizing the daily changes of the PM optical and microphysical properties by the aerosol scattering coefficient (σ p ) and the scattering Ångström coefficient (å). We found that on a daily basis σ p reached the minimum values when the irradiance reached the maximum values, since the convective motions, which favor the particle dispersion at the surface, increase with the irradiance. The å value, which is commonly used as qualitative indicator of the dominant particle size, has allowed evaluating the irradiance effects on the mean particle size distribution at the surface and revealed that the irradiance increase favors mainly the dispersion of the ground-level fine particles. Particle size-distribution measurements supported the last comment. Measurements were performed from 4 to 10 May 2015 when the study site was affected by a Saharan dust outbreak, to also evaluate the impact of long-range transported particles on the daily evolution of the ground-level particle's properties and the SW and LW irradiance.

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Section: Introductionmentioning

confidence: 60%

Section: Radiative Fluxes and Particle Scattering Coefficients From 4mentioning

confidence: 99%

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confidence: 99%

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Irradiance Impact on Pollution by Integrating Nephelometer Measurements

Perrone¹,

Burlizzi²,

Romano³

2015

Atmosphere

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“…The monitoring site is on a flat peninsula about 20 km away from both the Ionic and Adriatic Seas. Therefore, it may be considered as representative of coastal sites of the Central Mediterranean (Basart et al 2009;Mallet et al 2013;Perrone et al 2014b). The Balkan and northern Africa coasts are about 100 and 800 km away from it, respectively.…”

Section: Instrumentation and Methodsmentioning

confidence: 99%

“…The Mediterranean basin is a crossroad where particles from the surrounding European Countries, the African Continent, and the Atlantic Sea converge (Lelieveld et al 2002). Consequently, some studies by one of the authors have clearly indicated that both the chemical (Perrone et al 2013) and optical (Perrone et al 2014b) properties of the ground collected particulate matter and the columnar aerosol properties (Santese et al 2008; were strongly dependent on the main airflows affecting southeastern Italy. A brief overview of the three-wavelength lidar system and the CII-GF retrieval scheme is provided in BInstrumentation and methods^section.…”

Section: Introductionmentioning

confidence: 96%

Mediterranean aerosol typing by integrating three-wavelength lidar and sun photometer measurements

Perrone

Burlizzi

2016

Environ Sci Pollut Res

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Backscatter lidar measurements at 355, 532, and 1064 nm combined with aerosol optical thicknesses (AOTs) from sun photometer measurements collocated in space and time were used to retrieve the vertical profiles of intensive and extensive aerosol parameters. Then, the vertical profiles of the Ångström coefficients for different wavelength pairs (Å(λ1, λ2, z)), the color ratio (CR(z)), the fine mode fraction (η(z)) at 532 nm, and the fine modal radius (R f (z)), which represent aerosol characteristic properties independent from the aerosol load, were used for typing the aerosol over the Central Mediterranean. The ability of the Ångström coefficients to identify the main aerosol types affecting the Central Mediterranean with the support of the backward trajectory analysis was first demonstrated. Three main aerosol types, which were designed as continental-polluted (CP), marine-polluted (MP), and desert-polluted (DP), were identified. We found that both the variability range and the vertical profile structure of the tested aerosol intensive parameters varied with the aerosol type. The variability range and the altitude dependence of the aerosol extinction coefficients at 355, 532, and 1064 nm, respectively, also varied with the identified aerosol types even if they are extensive aerosol parameters. DP, MP, and CP aerosols were characterized by the Å(532, 1064 nm) mean values ± 1 standard deviation equal to 0.5 ± 0.2, 1.1 ± 0.2, 1.6 ± 0.2, respectively. η(%) mean values ± 1SD were equal to 50 ± 10, 73 ± 7, and 86 ± 6 for DP, MP, and CP aerosols, respectively. The R f and CR mean values ± 1SD were equal to 0.16 ± 0.05 μm and 1.3 ± 0.3, respectively, for DP aerosols; to 0.12 ± 0.03 μm and 1.8 ± 0.4, respectively, for MP aerosols; and to 0.11 ± 0.02 μm and 1.7 ± 0.4, respectively, for CP aerosols. CP and DP aerosols were on average responsible for greater AOT and LR values, but the LR and AOT dependence on wavelength was stronger for CP than for DP aerosols. The plots of the lidar ratio values at 355 nm versus the mean columnar values of the 532-1064 nm Ångström coefficient (Å c), the fine mode radius, the fine mode fraction at 532 nm (η c), and the color ratio, respectively, furthermore revealed the greater ability of the Å c and η c values to characterize different aerosol types.

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Estimation of mineral dust direct radiative forcing at the European Aerosol Research Lidar NETwork site of Lecce, Italy, during the ChArMEx/ADRIMED summer 2013 campaign: Impact of radiative transfer model spectral resolutions

Barragán

Romano

Sicard

et al. 2016

J. Geophys. Res. Atmos.

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A field campaign took place in the western and central Mediterranean basin on June–July 2013 in the framework of the ChArMEx (Chemistry‐Aerosol Mediterranean Experiment, http://charmex.lsce.ipsl.fr/)/ADRIMED (Aerosol Direct Radiative Impact on the regional climate in the MEDiterranean region, http://adrimed.sedoo.fr/) project to characterize the aerosol direct radiative forcing (DRF) over the Mediterranean. This work focuses on the aerosol DRF estimations at Lecce (40.33°N; 18.11°E; 30 m above sea level) during the Saharan dust outbreak that affected southern Italy from 20 to 24 June 2013. The Global Atmospheric Model (GAME) and the Two‐Stream (TS) model were used to calculate the instantaneous aerosol DRF in the short‐wave (SW) and long‐wave (LW) spectral ranges, at the surface and at the top of the atmosphere (TOA). The main differences between the two models were due to the different numerical methods to solve the radiative transfer (RT) equations and to the more detailed spectral resolution of GAME compared to that of TS. 167 and 115 subbands were used by GAME in the 0.3–4 and 4–37 µm spectral ranges, respectively. Conversely, the TS model used 8 and 11 subbands in the same spectral ranges, respectively. We found on 22 June that the SW‐DRFs from the two models were in good agreement, both at the TOA and at the surface. The instantaneous SW‐DRFs at the surface and at the TOA varied from −50 to −34 W m−2 and from −6 to +8 W m−2, respectively, while the surface and TOA LW‐DRFs ranged between +3.5 and +8.0 W m−2 and between +1.7 and +6.9 W m−2, respectively. In particular, both models provided positive TOA SW‐DRFs at solar zenith angles smaller than 25° because of the mixing of the desert dust with anthropogenic pollution during its transport to the study site. In contrast, the TS model overestimated the GAME LW‐DRF up to about 5 and 7.5 times at the surface and at the TOA, respectively, when the dust particle contribution was largest. The low spectral resolution of the real (n) and imaginary (k) refractive index values was mainly responsible for the LW‐DRF overestimates of the TS model. However, we found that the “optimization” of the n and k values at 8.75 and 11.5 µm was sufficient in this study to obtain a satisfactory agreement between the LW‐DRFs from the two models, both at the TOA and at the surface. The impact of the spectral dependence of the water vapor absorption coefficients on the estimation of the flux without aerosol has also been addressed. Paper results did not reveal any significant impact due to the different numerical methods used by the two models to solve the RT equations.

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Particle optical properties at a Central Mediterranean site: Impact of advection routes and local meteorology

Cited by 36 publications

References 32 publications

Irradiance Impact on Pollution by Integrating Nephelometer Measurements

Irradiance Impact on Pollution by Integrating Nephelometer Measurements

Mediterranean aerosol typing by integrating three-wavelength lidar and sun photometer measurements

Estimation of mineral dust direct radiative forcing at the European Aerosol Research Lidar NETwork site of Lecce, Italy, during the ChArMEx/ADRIMED summer 2013 campaign: Impact of radiative transfer model spectral resolutions

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