Investigation of aerosol distribution patterns and its optical properties at different time scale by using LIDAR system and AERONET

Tan, Fuyi; Khor, Wei Ying; Hee, Wan Shen; Choon, Yeap Eng; San, Lim Hwee; Abdullah, K.

doi:10.1063/1.4915232

Cited by 3 publications

(4 citation statements)

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“…They are made of mixture of different substances such as dust, smoke, organic matter, gas pollutants and airborne particles. Aerosols are injected into the atmosphere from both natural and anthropogenic sources [2] such as freezing of water vapor, condensation, dust storm, biomass burning, volcanic eruption, digging of soil through farming and irrigation, forest fire, vegetation, secondary inorganic salts, and sea spray. They are distributed in the atmosphere by turbulence and regional/global circulation (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Aerosol Robotic Network (AERONET) data is considered more reliable for local/regional aerosol study compared to satellite. Satellite observations, however, have the capability of providing global scale coverage of aerosol optical properties compare to AERONET which is limited to space coverage [15], as a result, many studies on aerosol optical properties [2] [15]- [19] have been conducted using AERONET sunphotometer or sky radiometer [20].…”

Section: Introductionmentioning

confidence: 99%

“…Understanding the aerosol trend pattern, variability, types and dominant aerosol in a particular region and time is therefore essential to help improve the accuracy of aerosol prediction models at a regional level. It can also make the determination of the effect of each aerosol in the atmosphere easier [2]. This study is essential in Nigeria because of the rapid increase in population density and economic growth that has given rise to increase anthropogenic emission at different rate, sources and region.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Variations of Aerosol Optical Properties and Identification of Different Aerosol Types Based on AERONET Data over Sub-Sahara West-Africa

Balarabe

Abdullah

Adlan

2016

ACS

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The uncertainty in the quantification of aerosol properties such as concentration, size, and composition, spatially and temporally makes regional studies important. Therefore, this study presents seasonal variations of aerosol optical properties over Ilorin (8˚32'N, 4˚34'E), Nigeria. Long-term (1998-2013) records of aerosol optical depth (AOD) and angstrom exponent α, from ground-based Aerosol Robotic Network (AERONET) are used to study the seasonal variability, characteristics and types of aerosol. The study showed that seasonal variations (Harmattan and Summer) result in different aerosol concentration, characteristics, and types. The magnitude and sensitivity of AOD to wavelength are found low in Summer with significant increase during Saharan dust transport season (Harmattan). The average mean AODs are 0.73 ± 0.50, 0.97 ± 0.52 and 0.46 ± 0.29 with corresponding mean angstrom of 0.66 ± 0.36, 0.68 ± 0.34, and 0.64 ± 0.37 for the entire period, Harmattan and Summer seasons. High frequency of occurrence of angstrom exponent below 1 (78% and 81%) which were observed during Harmattan and Summer indicates that the particles are generally coarse in mode. The results revealed that for both Harmattan and Summer seasons, the dominant aerosol was dust (DA) with frequency of occurrence of 82% and 79%. However, mixed aerosol (MIXA) (14.4%) is the second dominant case during Harmattan while in Summer maritime aerosol (MA) (9.1%) associated with transport due to southwesterly trade wind is the second dominant aerosol. This conclusion is supported by size distribution data for the study site which showed that large volume of aerosol particle size are enclosed in largely coarse mode range in all seasons. A 7-day back trajectory seasonal frequency plot sourced from the Hysplit Single Particles Lagrangian Integrated Trajectory model (Hysplit_4 model) shows that dust are transported from the Saha-* Corresponding author. ra during north-easterly trade wind flow while the observed marine aerosols are conveyed by the southwesterly trade wind influences to the study site.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal Variations of Aerosol Optical Properties and Identification of Different Aerosol Types Based on AERONET Data over Sub-Sahara West-Africa

Balarabe

Abdullah

Adlan

2016

ACS

Self Cite

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“…A AERONET (Aerosol Robotic Network) que é uma federação de redes de aerossóis de sensoriamento remoto estabelecidas pela NASA e pela PHOTONS, é considerada mais confiável para estudo de aerossóis locais e regionais em relação ao satélite. Muitos estudos sobre as propriedades ópticas de aerossóis (TAN, WEI, et al, 2015) são realizados utilizando a AERONET (HOLBEN, ECK, et al, 1998).…”

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Climatologia Da Profundidade Ótica E Dependência Espectral De Aerossóis Em Regiões De Floresta E Cerrado No Brasil

Menezes

Palácios

Menezes

et al. 2018

ABClima

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Aerossóis atmosféricos desempenham um papel importante no equilíbrio de energia do sistema Terra-atmosfera. Medidas de aerossóis foram realizadas em quatro sítios, dois em área de floresta (Rio Branco e Ji-Paraná) e dois em área de Cerrado (Cuiabá e Campo Grande), utilizando fotômetro solar da rede global AERONET. Dados de 5 anos permitiram classificar as propriedades óticas dos aerossóis, definindo a climatologia para cada sítio. Neste trabalho a profundidade óptica de aerossol (AOD 440nm) e expoente Angstrom, α(440-870), foram utilizados para a análise espectral de aerossol. Médias de AOD(440nm) para sítios de Cerrado foram, respectivamente, 0,29 (±0,40), 0,18(±0,24), com média correspondente de α 1,20(±0,39), 1,16(±0,36). Médias de AOD(440nm) para sítios de Floresta são, respectivamente, 0,85(±0,71), 0,35(±0,44), com média correspondente de α 1,38(±0,41), 1,40(±0,34). A AOD(440nm) tanto para regiões de Cerrado como de Floresta mostram picos distintos para estação seca e chuvosa, sendo que estão relacionados com padrões sazonais de aerossóis característicos dessas regiões. O α (440-870) apresentou modos de frequência que relacionam-se com os principais tipos de aerossóis presentes tanto em Cerrado como em Floresta. Um cenário principal de aerossóis foi definido como aerossóis oriundos de queima de biomassa, com forte influência de fontes locais de aerossóis poluídos. Mistura de aerossóis estão presentes, enquanto que poeira em suspensão tem uma ocorrência pouco relevante.

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Quantifying the Visibility and Human Health Effects of Aerosol Optical Depth Chemical Species in Some Cities of West Africa

Ayua,

Emetere,

Jain

et al. 2024

Aerosol Sci Eng

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Investigation of aerosol distribution patterns and its optical properties at different time scale by using LIDAR system and AERONET

Cited by 3 publications

References 1 publication

Seasonal Variations of Aerosol Optical Properties and Identification of Different Aerosol Types Based on AERONET Data over Sub-Sahara West-Africa

Seasonal Variations of Aerosol Optical Properties and Identification of Different Aerosol Types Based on AERONET Data over Sub-Sahara West-Africa

Climatologia Da Profundidade Ótica E Dependência Espectral De Aerossóis Em Regiões De Floresta E Cerrado No Brasil

Quantifying the Visibility and Human Health Effects of Aerosol Optical Depth Chemical Species in Some Cities of West Africa

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