Aerosol optical depth during episodes of Asian dust storms and biomass burning at Kwangju, South Korea

Ogunjobi, K. O.; Zhao, He; Kim, K.W; Kim, Y.J

doi:10.1016/j.atmosenv.2003.11.031

Cited by 60 publications

(50 citation statements)

References 26 publications

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“…This is attributed to the high column concentration of coarse mode particles due to the heavy dust loading. This phenomenon was also reported by other researchers, e.g., Kim et al (2004), Ogunjobi et al (2004), and Kim et al (2008). Ogunjobi et al (2004) showed that dust days were associated with relatively higher AOD values than non-dust event days at Kwangju in South Korea.…”

Section: Columnar Optical Parameterssupporting

confidence: 70%

“…This phenomenon was also reported by other researchers, e.g., Kim et al (2004), Ogunjobi et al (2004), and Kim et al (2008). Ogunjobi et al (2004) showed that dust days were associated with relatively higher AOD values than non-dust event days at Kwangju in South Korea. The similar phenomenon was also observed in Indo-Gangetic (IG) plains, Indian (Prasad and Singh, 2007).…”

Section: Columnar Optical Parameterssupporting

confidence: 70%

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Dust events in Beijing, China (2004–2006): comparison of ground-based measurements with columnar integrated observations

Cheng

et al. 2009

Atmos. Chem. Phys.

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Abstract. Ambient particle number size distributions spanning three years were used to characterize the frequency and intensity of atmospheric dust events in the urban areas of Beijing, China in combination with AERONET sun/sky radiometer data. Dust events were classified into two types based on the differences in particle number and volume size distributions and local weather conditions. This categorization was confirmed by aerosol index images, columnar aerosol optical properties, and vertical potential temperature profiles. During the type-1 events, dust particles dominated the total particle volume concentration (<10 µm), with a relative share over 70%. Anthropogenic particles in the Aitken and accumulation mode played a subordinate role here because of high wind speeds (>4 m s −1 ). The type-2 events occurred in rather stagnant air masses and were characterized by a lower volume fraction of coarse mode particles (on average, 55%). Columnar optical properties showed that the superposition of dust and anthropogenic aerosols in type-2 events resulted in a much higher AOD (average: 1.51) than for the rather pure dust aerosols in type-1 events (average AOD: 0.36). A discrepancy was found between the groundbased and column integrated particle volume size distributions, especially for the coarse mode particles. This discrepancy likely originates from both the limited comparability of particle volume size distributions derived from Sun photometer and in situ number size distributions, and the inhomogeneous vertical distribution of particles during dust events.

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Section: Columnar Optical Parameterssupporting

confidence: 70%

Section: Columnar Optical Parameterssupporting

confidence: 70%

Dust events in Beijing, China (2004–2006): comparison of ground-based measurements with columnar integrated observations

Cheng

et al. 2009

Atmos. Chem. Phys.

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“…Grandes valores de α para o intervalo de 440-870nm indicam altas concentrações para partículas finase baixas para partículas grossas. Espera-se que α para 440-870nm seja da ordem de 4 para as partículas de aerossóis muito pequenas (dimensões de moléculas presentes no ar) e se aproxime de 0 para partículas muito grandes (HOLBEN et al, 2001).Observa-se ainda na Figura 9, que o valor de  atingiu extremo superior de 2,0 para os picos da AOD caracterizando o material particulado relativamente pequeno para esses períodos, evidentemente material proveniente da queima de biomassa (ECK et al, 2003b;OGUNJOBI et al, 2004;QUEFACE et al, 2011). Já nos períodos fora da estiagem os valores para  variaram de 0,2 a 1,8 caracterizando uma atmosfera praticamente limpa para estes períodos (ARTAXO et al, 2006).…”

Section: Resultsunclassified

Análise Da Profundidade Ótica De Aerossóis E Coeficiente De Angstrom No Cerrado Mato-Grossense

Palácios

Sallo²,

Prado³

et al. 2014

ABClima

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“…The contour density map makes use of the relationship between AOD 500 nm and AE 440-870 nm because of their strong wavelength dependence. These 2-dimensional binning of AOD 500 nm versus AE nm patterns have been observed at several locations and for different aerosol types (e.g., biomass smoke, anthropogenic aerosols, desert dust) (Masmoudi et al, 2003;Kim et al, 2004;Ogunjobi et al, 2004;Eck et al, 2010). Further, the method of contour density maps is based on the sensitivity of these parameters to different, somewhat independent, microphysical aerosol properties (Kalapureddy et al, 2009;Kaskaoutis et al, 2011).…”

Section: Observed Curvatures In Aerosol Optical Depth Spectramentioning

confidence: 99%

Multi-Year Analysis of Aerosol Properties Retrieved from the Ångström Parameters for Different Spectral Ranges over Pune

Kolhe

Pawar

Varpe

et al. 2016

Aerosol Air Qual. Res.

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The present study evaluates the temporal variation of aerosol optical depth (AOD 500 nm ) and the Ångström parameters [viz., Ångström exponent (AE, α), Ångström turbidity coefficient (β) and second order Ångström exponent (α′)] at a tropical observing site, Pune (18°32′N; 73°49′E, 559 m AMSL) during 2008-15. Six-year means for winter and premonsoon seasons together are found to be 0.534 ± 0.13, 1.054 ± 0.27, 0.254 ± 0.08 and 0.167 ± 1.33 for AOD 500 nm , AE, β and α′ respectively. Average month-to-month variability of AOD 500 nm , AE, β and α′ during 2008-15 depicts seasonal cycle with strong departures with respect to long-term means. Frequency distributions for AOD, AE and β are positively skewed (skewness = 0.77, 0.32 and 1.14 respectively) while it is negatively skewed for α′ (skewness = -0.18). Analysis of AE difference, curvature parameter difference (α 2 -α 1 ) and AOD 500 nm -AE 440-870 nm contour density map reveals that the aerosol ensemble at Pune consists of four aerosol types viz., UI (urban/industrial), CM (clear maritime), DD (desert dust) and MT (mixed type). Their relative magnitudes, however, differ during winter and pre-monsoon seasons. Thus, the contour density map shows dominance of UI and relatively less occurrence of MT type aerosols during winter. In pre-monsoon, however, the aerosol scenario is driven by MT type aerosol although UI and DD type aerosols show their remarkable existence.

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Aerosol optical depth during episodes of Asian dust storms and biomass burning at Kwangju, South Korea

Cited by 60 publications

References 26 publications

Dust events in Beijing, China (2004–2006): comparison of ground-based measurements with columnar integrated observations

Dust events in Beijing, China (2004–2006): comparison of ground-based measurements with columnar integrated observations

Análise Da Profundidade Ótica De Aerossóis E Coeficiente De Angstrom No Cerrado Mato-Grossense

Multi-Year Analysis of Aerosol Properties Retrieved from the Ångström Parameters for Different Spectral Ranges over Pune

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