Laser method of determining the turbulence parameter C n 2 on the basis of light scattering by atmospheric aerosol

1981 ◽  
Vol 24 (3) ◽  
pp. 206-210 ◽  
Author(s):  
M. S. Belen'kii ◽  
V. L. Mironov
Keyword(s):  
Light Scattering ◽  
Atmospheric Aerosol ◽  
Turbulence Parameter ◽  
Laser Method

scholarly journals Model of the process of extreme light scattering by atmospheric aerosol particle

2021 ◽  
Vol 64 (5) ◽  
pp. 376-383
Author(s):  
I.A. Potapova ◽  
A.P. Bobrovsky ◽  
N.V. Dyachenko ◽  
Yu.B. Rzhonsnitskaya ◽  
N.A. Sanotskaya ◽  
...  
Keyword(s):  
Light Scattering ◽  
Aerosol Particle ◽  
Atmospheric Aerosol

scholarly journals A European aerosol phenomenology-6: Scattering properties of atmospheric aerosol particles from 28 ACTRIS sites

2017 ◽  
Author(s):  
Marco Pandolfi ◽  
Lucas Alados-Arboledas ◽  
Andrés Alastuey ◽  
Marcos Andrade ◽  
Begoña Artiñano ◽  
...  
Keyword(s):  
Light Scattering ◽  
Eastern Europe ◽  
Atmospheric Aerosol ◽  
Central And Eastern Europe ◽  
Aerosol Particles ◽  
Accumulation Mode ◽  
Annual Variability ◽  
Baltic Countries ◽  
Atmospheric Aerosol Particles ◽  
Fine Mode

Abstract. This paper presents the light scattering properties of atmospheric aerosol particles measured over the past decade at 28 ACTRIS observatories, located mainly in Europe. The data include particle light scattering (σsp) and hemispheric backscattering (σbsp) coefficients, scattering Ångström exponent (SAE), backscatter fraction (BF) and asymmetry parameter (g). A large range of ssp was observed across the network. Low ssp values were on average measured in Nordic and Baltic countries and in Western Europe whereas the highest σsp were measured at regional sites in eastern and central Europe. In these regional areas the SAE was also high indicating the predominance of fine-mode particles. On average, the SAE was lower in the Nordic and Baltic, western and southern countries suggesting a lower fraction of fine-mode particle compared to central and eastern Europe. An increasing gradient of ssp was observed when moving from mountain to regional and to urban sites. Conversely, the mass-independent SAE and g parameters did not show the same gradient. At all sites, both SAE and g varied greatly with aerosol particle loading. The lowest values of g were always observed under low ssp indicating a larger contribution from particles in the smaller accumulation mode. Then, g steeply increased with increasing ssp indicating a progressive shift of the particle size distribution toward the larger end of the accumulation mode. Under periods of high particle mass concentrations, the variation of g was less pronounced whereas the SAE increased or decreased suggesting changes mostly in the coarse aerosol particles mode rather than in the fine mode. The station placement seemed to be the main parameter affecting the intra-annual variability. At mountain sites, higher σsp was measured in summer mainly because of the enhanced boundary layer influence. Conversely, less horizontal and vertical dispersion in winter led to higher σsp at all low altitude sites in central and eastern Europe compared to summer. On average, these sites also showed SAE maxima in summer (and correspondingly g minima). Large intra-annual variability of SAE and g was observed also at Nordic and Baltic countries due to seasonal-dependent transport of different air masses to these remote sites. Statistically significant decreasing trends of σsp were observed at 5 out of 13 stations included in trend analyses. The total reductions of ssp were consistent with those reported for PM2.5 and PM10 mass concentrations over similar periods across Europe.

scholarly journals Transport of Atmospheric Aerosol by Gap Winds in the Columbia River Gorge

2008 ◽  
Vol 47 (1) ◽  
pp. 15-26 ◽  
Author(s):  
Mark C. Green ◽  
Jin Xu ◽  
Narendra Adhikari
Keyword(s):  
Light Scattering ◽  
Wind Speed ◽  
Atmospheric Aerosol ◽  
Columbia River ◽  
Pressure Gradients ◽  
Gap Flow ◽  
Westerly Winds ◽  
Gap Winds ◽  
Diurnal Wind ◽  
The City

Abstract Typical diurnal wind patterns and their relationship to transport of atmospheric aerosol in the Columbia River gorge of Oregon and Washington are addressed in this paper. The measurement program included measurements of light scattering by particles (bsp) with nephelometers, and wind speed and direction, temperature, and relative humidity at seven locations in the gorge. Winds are shown to respond to along-gorge pressure gradients, and five common patterns were identified: strong, moderate, and light westerly (west to east), light easterly, and winter easterly. The strong westerly and winter easterly patterns were the most common summer and winter patterns, respectively, and represented strong gap flow. The light westerly and light easterly patterns occurred most frequently in spring and autumn transition periods. Winter easterly had the highest light scattering and indicated sources east of the gorge mainly responsible for haze. During summer, as westerly winds increased diurnally, a pulse of hazy air from the Portland, Oregon, metropolitan area is transported eastward into the gorge, arriving later with distance into the gorge. During light easterly flow impacts to haze from the city of The Dalles, Oregon, are noted as the wind shifts direction diurnally.

Chemical composition and light scattering of the atmospheric aerosol at a remote site in the Negev Desert, Israel

1997 ◽  
Vol 28 ◽  
pp. S73-S74 ◽  
Author(s):  
W. Maenhaut ◽  
J. Cafmeyer ◽  
J. Ptasinski ◽  
M.O. Andreae ◽  
T.W. Andreae ◽  
...  
Keyword(s):  
Light Scattering ◽  
Chemical Composition ◽  
Atmospheric Aerosol ◽  
Negev Desert ◽  
Remote Site

Atmospheric aerosol characterization using multiwavelength multistatic light scattering

2010 ◽  
Author(s):  
Andrea M. Brown ◽  
Michelle G. Snyder ◽  
Lydia Brouwer ◽  
C. Russell Philbrick
Keyword(s):  
Light Scattering ◽  
Atmospheric Aerosol ◽  
Aerosol Characterization

Interrelations between chemical composition and light scattering of the atmospheric aerosol at NYA˚lesund, Spitsbergen

1999 ◽  
Vol 30 ◽  
pp. S119-S120
Author(s):  
W. Maenhaut ◽  
I. Rajta ◽  
K. Beyaert ◽  
C. Leck ◽  
K. Holmen ◽  
...  
Keyword(s):  
Light Scattering ◽  
Chemical Composition ◽  
Atmospheric Aerosol

scholarly journals A European aerosol phenomenology – 6: scattering properties of atmospheric aerosol particles from 28 ACTRIS sites

2018 ◽  
Vol 18 (11) ◽  
pp. 7877-7911 ◽  
Author(s):  
Marco Pandolfi ◽  
Lucas Alados-Arboledas ◽  
Andrés Alastuey ◽  
Marcos Andrade ◽  
Christo Angelov ◽  
...  
Keyword(s):  
Light Scattering ◽  
Eastern Europe ◽  
Aerosol Particle ◽  
Atmospheric Aerosol ◽  
Western Europe ◽  
Central And Eastern Europe ◽  
Aerosol Particles ◽  
Geographical Location ◽  
Atmospheric Aerosol Particles ◽  
Fine Mode

Abstract. This paper presents the light-scattering properties of atmospheric aerosol particles measured over the past decade at 28 ACTRIS observatories, which are located mainly in Europe. The data include particle light scattering (σsp) and hemispheric backscattering (σbsp) coefficients, scattering Ångström exponent (SAE), backscatter fraction (BF) and asymmetry parameter (g). An increasing gradient of σsp is observed when moving from remote environments (arctic/mountain) to regional and to urban environments. At a regional level in Europe, σsp also increases when moving from Nordic and Baltic countries and from western Europe to central/eastern Europe, whereas no clear spatial gradient is observed for other station environments. The SAE does not show a clear gradient as a function of the placement of the station. However, a west-to-east-increasing gradient is observed for both regional and mountain placements, suggesting a lower fraction of fine-mode particle in western/south-western Europe compared to central and eastern Europe, where the fine-mode particles dominate the scattering. The g does not show any clear gradient by station placement or geographical location reflecting the complex relationship of this parameter with the physical properties of the aerosol particles. Both the station placement and the geographical location are important factors affecting the intra-annual variability. At mountain sites, higher σsp and SAE values are measured in the summer due to the enhanced boundary layer influence and/or new particle-formation episodes. Conversely, the lower horizontal and vertical dispersion during winter leads to higher σsp values at all low-altitude sites in central and eastern Europe compared to summer. These sites also show SAE maxima in the summer (with corresponding g minima). At all sites, both SAE and g show a strong variation with aerosol particle loading. The lowest values of g are always observed together with low σsp values, indicating a larger contribution from particles in the smaller accumulation mode. During periods of high σsp values, the variation of g is less pronounced, whereas the SAE increases or decreases, suggesting changes mostly in the coarse aerosol particle mode rather than in the fine mode. Statistically significant decreasing trends of σsp are observed at 5 out of the 13 stations included in the trend analyses. The total reductions of σsp are consistent with those reported for PM2.5 and PM10 mass concentrations over similar periods across Europe.

scholarly journals Impact of atmospheric aerosol light scattering and absorption on terrestrial net primary productivity

2002 ◽  
Vol 16 (4) ◽  
pp. 37-1-37-12 ◽  
Author(s):  
Daniel S. Cohan ◽  
Jin Xu ◽  
Roby Greenwald ◽  
Michael H. Bergin ◽  
William L. Chameides
Keyword(s):  
Light Scattering ◽  
Primary Productivity ◽  
Atmospheric Aerosol ◽  
Net Primary Productivity

scholarly journals Analysis of the polydispersity of soil-like bodies in glacier environments by the laser light scattering (diffraction) method

2021 ◽  
Vol 66 (3) ◽  
Author(s):  
Evgeny Abakumov ◽  
Timur Nizamutdinov ◽  
Viacheslav Polyakov
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Laser Light ◽  
Diffraction Method ◽  
Laser Light Scattering ◽  
Scattering Method ◽  
Polar Regions ◽  
Laser Method

This study presents the results of polydispersity analysis of soil-like bodies from two various polar regions using the laser light scattering method. The differences in the particle size distribution of cryoconite samples from the Anuchin Glacier (Antarctica) and the Mushketov Glacier (Arctic) are described. The samples obtained from the Mushketov Glacier are characterized by a finer particle size distribution than samples collected on the Anuchin Glacier. While comparing our results with previously published studies, it was found that the method of laser light scattering shows a lower content of small fractions (<0.05 mm) compared to the classical methods of sedimentation, since these methods are based on fundamentally different physical principles. The laser method used requires low amounts of samples (0.2–0.5 g), while the classical sedimentary method uses a higher gravimetric portion of cryoconite (5–10 g), which is critical for field sampling.

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