Analysis of optical properties of atmospheric aerosols inferred from spectral AODs and Ångström wavelength exponent

Balakrishnaiah, G.; Kumar, Krishan; Reddy, B. Suresh Kumar; Gopal, K. Rama; Reddy, R.R.; Reddy, L. Siva Sankara; Ahammed, Y. Nazeer; Narasimhulu, K.; Moorthy, K. Krishna; Babu, S. Suresh

doi:10.1016/j.atmosenv.2010.12.002

Cited by 28 publications

(13 citation statements)

References 38 publications

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“…The present study reveals (Fig. 4) a conspicuous evening peak (during 17:00 to 22:00 local time) in the diurnal variations of BC concentrations at the shorter timescales during February-May, and decrease gradually towards morning and become lowest during the early morning hours (05:00), again increases after the sunrise, typical to a continental site subjected to the dynamics of the atmospheric boundary layer (Nair et al, 2007;Balakrishnaiah et al, 2011). The diurnal variations remain inconspicuous from August to February, even though a less pronounced diurnal pattern similar to that in March-May is noticeable during June and October.…”

Section: Temporal Variation Of Bc Mass Concentrationmentioning

confidence: 99%

Aerosol black carbon characteristics over a high-altitude Western Ghats location in Southern India

et al. 2014

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Abstract. Aerosol black carbon (BC) mass concentrations were continuously monitored over a period of 2 years (April 2010 to May 2012) from a high-altitude location Ooty in the Nilgiris Mountain range in southern India to characterize the distinct nature of absorbing aerosols and their seasonality. Despite being remote and sparsely inhabited, BC concentrations showed significant seasonality with higher values (∼ 0.96 ± 0.35 µg m −3 ) in summer (March to May), attributed to increased vertical transport of effluents in the upwind valley regions, which might have been confined to the surrounding valley regions within the very shallow winter boundary layer. The local atmospheric boundary layer (ABL) influence in summer was further modulated by the long-range transported aerosols from the eastern locations of Ooty. During monsoon (June-August), the concentrations were far reduced (∼ 0.23 ± 0.06 µg m −3 ) due to intense precipitation. Diurnal variations were found conspicuous mainly during summer season associated with local ABL. The spectral absorption coefficients (α abs ) depicted, in general, flatter distribution (mostly < 1.0 for more than 85 % of daily mean values), suggesting the relative dominance of fossil fuel combustion, though showed marginal seasonal change with higher values of α abs in summer.

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Section: Temporal Variation Of Bc Mass Concentrationmentioning

confidence: 99%

Aerosol black carbon characteristics over a high-altitude Western Ghats location in Southern India

et al. 2014

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“…There exists a well-defined seasonal variation in CWC, with the maximum value during the monsoon months and minimum during winter months. Similar variations in CWC have been observed from other locations in India (e.g., Moorthy et al, 1999;Balakrishnaiah et al, 2011).The validation of gridded products (MODIS) is important as they are used for assimilation in numerical weather prediction and global climate models (Prasad et al, 2009). For this purpose, detailed validation of MODIS water vapor product is attempted.…”

Section: Validation Of Modis Aerosol Optical Thicknessmentioning

confidence: 93%

Discrimination of Aerosol Types and Validation of MODIS Aerosol and Water Vapour Products Using a Sun Photometer over Central India

Kannemadugu

Varghese

Mukkara

et al. 2015

Aerosol Air Qual. Res.

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Aerosol optical properties were studied using handheld Microtops II sun photometer over Nagpur (79.028°E, 21.125°N) located in central India, suggests highest Aerosol Optical Depth (AOD) (0.64 ± 0.08) during Pre-Monsoon Season (PMS) and lowest AOD (0.38 ± 0.06) during Summer Monsoon Season (SMS). Using the scatter plot of AOD 500 versus Angstrom exponent (α), dominating type of aerosol, during the most of the seasons is found to be urban/industrial and biomass burning (UB). Moderate Resolution Imaging Spectroradiometer (MODIS) active fire data suggests a large amount of biomass burning in different parts of India during PMS compared to other seasons. Aerosol transport analysis suggests during PMS, the air masses were originated from the biomass burning regions, desert regions and also from marine regions. Seasonal variation of AOD 550 over India using MODIS data indicates significant AOD (> 0.7) over northwest during SMS, Indo -Gangetic region during Post Monsoon Season (PoMS) and north east region during winter. Southern part of India shows relatively less AOD (< 0.45) compared to north India during all the seasons. MODIS derived AOD and water vapor (NIR), compared against the ground-based observations from sun photometer, indicates an underestimation of 35% lower AOD compared to sun photometer and overestimation of 20% higher water vapor with correlation coefficients of 0.75 and 0.89 respectively. In view of the sizeable contribution of biomass burning aerosols, we suggest the use of a more absorbing type of aerosol model for central India, for an accurate retrieval of AOD from MODIS.

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“…The curvature can be an indicator of the aerosol particle size, with negative sign indicating the aerosol size distributions dominated by fine mode and the positive curvature is indicated by the size distributions with significant contribution by coarse mode aerosols (Schuster et al, 2006;Balakrishnaiah et al, 2011). In addition, the coefficients a 1 and a 2 are obtained from the second order polynomial fit to the AOD values at four channels (380, 500, 870 and 936 nm).…”

Section: Site Description Instrumentation and Methodologymentioning

confidence: 99%

Columnar-integrated aerosol optical properties and classification of different aerosol types over the semi-arid region, Anantapur, Andhra Pradesh

Gopal

S.Md

Balakrishnaiah

et al. 2015

Science of The Total Environment

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Analysis of optical properties of atmospheric aerosols inferred from spectral AODs and Ångström wavelength exponent

Cited by 28 publications

References 38 publications

Aerosol black carbon characteristics over a high-altitude Western Ghats location in Southern India

Aerosol black carbon characteristics over a high-altitude Western Ghats location in Southern India

Discrimination of Aerosol Types and Validation of MODIS Aerosol and Water Vapour Products Using a Sun Photometer over Central India

Columnar-integrated aerosol optical properties and classification of different aerosol types over the semi-arid region, Anantapur, Andhra Pradesh

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