Columnar physical and radiative properties of atmospheric aerosols in north central Spain

Cachorro, Victoria E.; Durán, P.; Vergaz, Ricardo; Frutos, Ángel M. de

doi:10.1029/1999jd901165

Cited by 44 publications

(35 citation statements)

References 55 publications

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“…5, shows large portion of particles between the 0 < τ a500 < 1.0 and α > 1.5 or a clear fine mode regime. The α is commonly used as an indicator of the predominant aerosol size and eventually the source, because the spectral shape of the extinction is related to the particle size (Eck et al, 1999;Cachorro et al, 2000b;Schuster et al, 2006). The second largest concentration of particles can be found between AOD levels of the order of 1.0 < τ a500 < 4.0 with associated α > 1.0.…”

Section: Resultsmentioning

confidence: 99%

Aerosol Properties in Central Kalimantan Due to Peatland Fire

Kusumaningtyas

Aldrian

Rahman

et al. 2016

Aerosol Air Qual. Res.

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The optical properties of aerosol could describe the potential source of prevalent pollutants of certain area. With the annual occurrences of biomass burning over the peat swamp forest, the study of aerosol characters in Central Kalimantan province becomes important. Aerosols from Aerosol Robotic Network (AERONET) data network combine with some environmental parameters, i.e., rainfall, visibility, surface humidity and hotspot number are investigated. Here we use the data from 2012 to 2014 collected from AERONET in Palangkaraya. We found a strong relationship between aerosol properties and environmental parameters (rainfall, hotspot number, visibility). Variability of aerosol properties such as aerosol optical depth (AOD), Angstrom exponent number, and its fine mode are consistent with the dry period between August and October when most fire episodes occur. In fact, the increase of aerosol loading occurs mostly when the monthly rainfall reaches below 150 mm month -1 (dry period), as the cut off number of our analyses. Considerable reduction of visibility below 500 m occurs whenever AOD is above 3.0. During observation period, we found that aerosol sources at this location originate from dust, marine aerosol, continental and urban aerosol, and biomass burning. The biomass burning aerosol gave a substantially high AOD values that reach almost 6.0 and fine feature as an indication of highly concentrated smoke from peatland source. Moreover, smouldering combustion from peat land is characterized by high value of single scattering albedo observed in the location.

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Section: Resultsmentioning

confidence: 99%

Aerosol Properties in Central Kalimantan Due to Peatland Fire

Kusumaningtyas

Aldrian

Rahman

et al. 2016

Aerosol Air Qual. Res.

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“…This aerosol density value has been used in previous studies of continental regions in the Iberian Peninsula (Cachorro et al 2000), and can be justi ed as a result of the rather dry conditions characteristic of the area. By de nition m L depends on the total columnar number of particles, but it also displays a clear dependence on larger sized aerosols.…”

Section: Aerosol Size Distribution (A) Methodologymentioning

confidence: 99%

Aerosol size properties at Armilla, Granada (Spain)

Alados-Arboledas

Lyamani

Olmo

2003

Quart J Royal Meteoro Soc

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SUMMARYThe size characteristics of atmospheric aerosol over a suburban environment on the outskirts of Granada, a non-industrialized medium sized city in south-eastern Spain, were investigated using ve years of continuous spectral measurements in the range 368-778 nm. From these the aerosol optical depths at the corresponding wavelengths were derived. Aerosol columnar size distributions were then retrieved from the spectral optical depths. These, and a set of derived aerosol properties including columnar mass, columnar surface or columnar number of particles, were then examined. For the analysed series two different periods were observed, one with a prevalence towards Junge type distributions and a second where bimodal log-normal distributions were favoured; these coincided with periods of atypical severe drought and typical meteorological conditions, respectively, that affected the measurement area. The bimodal distributions present a clearly de ned mode in the range 0.4-0.8 ¹m radius, with a less well-de ned mode for smaller radii. For periods typifying normal conditions the behaviour of the lower and higher modes were analysed. The higher mode is slightly sharper with a consistent position compared to the lower mode. The relationships among the different aerosol size properties and the aerosol optical properties were also analysed. A good correlation was found between the Angström exponent, that measures the aerosol optical-depth' s spectral dependence, and the ratio of columnar particle density for large and small particle sizes in the accumulation mode. It is also shown that the aerosol optical depth at 500 nm is a good predictor of columnar aerosol properties such as the aerosol mass or surface area.

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“…In spite of the poor correlation between the AOD and α parameter [5,7] values, both quantities must be considered for a realistic analysis. The studies by [3] showed that α value depends strongly on the spectral range.…”

Section: Variation Of Angstrom Parameters α and βmentioning

confidence: 99%

Variations of Aerosol Optical Depth in Bhaktapur, Nepal

Sharma

2018

J. Inst. Engineering

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Abstract:The study is based on the variations of aerosol optical depth in Bhaktapur, Nepal. Microtops II Sunphotometer, manufactured by solar light inc. USA was used to measure the Aerosol optical depth. The diurnal variations of Aerosol Optical Depth (AOD) in January, 9 at 2.32UT were found to be 1.01, 0.89, 0.81 and 0.61 at 340,440, 500 and 675nm respectively. Besides ozone and clouds, aerosol plays an influencing role to attenuate solar UV radiation reaching the ground. Spectral dependence of AOD possesses higher values at shorter wavelengths and gradually decreases towards longer wavelengths in all seasons. The value of wavelength exponent (α) and aerosols concentration (β) on June 15 and July 25 at Kaushaltar were found to be 0.80, 0.56 and 0.45, 0.57 respectively.

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Columnar physical and radiative properties of atmospheric aerosols in north central Spain

Cited by 44 publications

References 55 publications

Aerosol Properties in Central Kalimantan Due to Peatland Fire

Aerosol Properties in Central Kalimantan Due to Peatland Fire

Aerosol size properties at Armilla, Granada (Spain)

Variations of Aerosol Optical Depth in Bhaktapur, Nepal

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