Contrasting aerosol characteristics and radiative forcing over Hyderabad, India due to seasonal mesoscale and synoptic‐scale processes

Sinha, P. R.; Dumka, U. C.; Manchanda, R. K.; Kaskaoutis, Dimitris G.; Sreenivasan, S. V.; Moorthy, K. Krishna; Babu, S. Suresh

doi:10.1002/qj.1963

Cited by 45 publications

(16 citation statements)

References 90 publications

(104 reference statements)

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“…water soluble, insoluble and soot) were used in the urban aerosol model as described in Optical Properties of Aerosols and Clouds (OPAC; Hess et al, 1998). The BC number density corresponding to online BC mass concentrations is incorporated in OPAC and number concentrations of water soluble and insoluble aerosols are iteratively adjusted to obtain the best fit (uncertainty within ±5%) between measured and modelled spectral AODs Sinha et al, 2012). The aerosol optical properties (AOD, SSA and g) were estimated with and without inclusion of BC in OPAC and then are inserted in SBDART.…”

Section: Radiative Impact Of Bcmentioning

confidence: 99%

Carbonaceous aerosols and pollutants over Delhi urban environment: Temporal evolution, source apportionment and radiative forcing

Bisht

Dumka

Kaskaoutis

et al. 2015

Science of The Total Environment

155

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Section: Radiative Impact Of Bcmentioning

confidence: 99%

Carbonaceous aerosols and pollutants over Delhi urban environment: Temporal evolution, source apportionment and radiative forcing

Bisht

Dumka

Kaskaoutis

et al. 2015

Science of The Total Environment

155

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“…From normal to foggy day, there is increase in lower wavelength α, and this increase is higher than the decrease in higher wavelength α (and entire wavelength α). This indicates that during the foggy day the size of the fine-mode aerosols decrease, suggesting additional transport of freshly emitted aerosols, mostly from urban and industrialized regions; concurrently, an increase in coarse-mode abundance is revealed due to slightly lower α 0.675-1.02 that indicates a little lower fine-to-coarse mode ratio (Sinha et al, 2012). During the foggy period, there is ultra-fine aerosol formation by gas-to-particle conversion in nucleation mode (< 0.1 µm), as was observed over IGB urban areas (Ganguly et al, 2006;Das et al, 2008), which results in higher α in the shorter wavelengths.…”

Section: Variation In Aerosol Optical Depthmentioning

confidence: 92%

“…Angstrom exponent (α) was calculated from the measured spectral AODs over Sundarban during the foggy and normal days. α is the slope of AOD versus wavelength in logarithmic scale and provides information about the size distribution of aerosols where higher (lower) α represents dominance of relatively smaller (bigger) particles (Das et al, 2008;Sinha et al, 2012). In the present study, α was calculated in the lower (0.38 to 0.50 µm), higher (0.675 to 1.02 µm) and entire (0.38 to 1.02 µm) wavelength range and is found to be 0.6 ± 0.1, 1.2 ± 0.2 and 1.0 ± 0.1, respectively, on normal day and 0.8 ± 0.1, 1.1 ± 0.3 and 0.9 ± 0.2, respectively, on the foggy day.…”

Section: Variation In Aerosol Optical Depthmentioning

confidence: 99%

Fog-Induced Changes in Optical and Physical Properties of Transported Aerosols over Sundarban, India

Das

Chatterjee

Ghosh

et al. 2015

Aerosol Air Qual. Res.

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A campaign was conducted at Kalas Island, Sundarban to address fog-induced changes in optical and physical properties of aerosols during the winter period (11-16 January 2014). Being an isolated remote island in the northern coastal region of Bay of Bengal, the measurement site provides a unique opportunity to investigate aerosol properties and foggy conditions during transported aerosol plumes from the Indo-Gangetic Basin (IGB). Two fog events were observed over Sundarban during the campaign increasing Aerosol Optical Depth (AOD) by almost a factor of three (1.6 ± 0.4) compared to "background" AOD of 0.52 ± 0.2 on a normal winter day. Back-trajectory analysis shows that aerosols mostly originate from the IGB contributing to higher fine-mode as well as coarse-mode aerosol concentrations during the foggy days. Black Carbon (BC), known as a tracer for anthropogenic sources, is found to be about 15.2 ± 1.3 µg/m 3 at such a remote region and increased by 30% during foggy days indicating strong influence from transported anthropogenic aerosols from nearby urban regions. Similar enhancement is also observed in aerosol absorption coefficient, especially in the UV region. Low ventilation due to calm and cool atmosphere with a shallow boundary layer during foggy days could have 'trapped' BC over Sundarban and resulted in such an enhancement. On the other hand, the absorption angstrom exponent reduced indicating dominance of weakly spectral dependent aerosols during foggy period, mostly associated with fossil-fuel combustion. However, this could also be the result of BC coating with water-soluble species under high RH conditions. Enhancement of absorbing aerosols during foggy period reduces the incoming solar radiation, causing large perturbation in the radiation budget over the site.

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“…The PM 2.5 concentration is closely related to moisture in the 3 sampling times, whereas Yile (2017) points out that a lower wind speed in the lower atmosphere reduces transport he dispersion of aerosols increases the accumulation of aerosols near their sources and increases the local concentrations of aerosols. Dumka et al (2013Dumka et al ( , 2015 note that in addition to seasonal variability, mass concentrations of PM 2.5 also exhibit pronounced diurnal patterns, strongly related to the combined effects of local emissions, meteorology and boundary layer dynamics. However, the effect of wind dynamics is identified as the main actor of dust uplift (Tiwari et al, 2017).…”

Section: Variables (Axes F1 Et F2: 9908 %)mentioning

confidence: 99%

Quantification of mass concentrations aerosols PM2.5 in primary schools. Case study: Tiaret city (Algeria)

Naceur

Maatoug

Benaichata

et al. 2019

EREM

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23 primary schools have been selected in Tiaret city, and the collection of PM2.5 was performed in the morning, afternoon and evening, in the presence and absence of the pupils. The results found have shown a gradient of concentrations of PM2.5 by site typology. Low and average concentrations are recorded in the areas close to forests: 23.32±2.77 µg/m3 and the high concentrations are observed in the sites exposed to road traffic: 33.57±3.27 µg/m3 in winter. However, concentrations recorded in the urban sites are lower in the summer (sites exposed to road traffic: 25.33±2.85 µg/m3, sites close to the forests 23.78± 1.92µg/m3). We also noticed that the dominance of PM2.5 has been observed in the vicinity of the major axes of movement. The dispersion of these particles is illustrated by a detailed maps. The maps present information obtained by hierarchical classification, they aim to answer a need for spatial knowledge of the problem of particulate pollution in urban areas in the city of Tiaret. The hierarchical classification allowed to distinguish three groups of schools: urban, urban highly subject to dense road traffic and schools close to green spaces and forests. The results obtained revealed a high contamination of the atmospheric environment of the city of Tiaret by PM2.5 aerosols, taking into account the results recorded in primary schools. Mass concentration of PM2.5 in the 1st period (autumn and winter) is higher than that of the 2nd period (spring and summer). Indeed, the highest concentrations are recorded in the presence of pupils in winter.

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Contrasting aerosol characteristics and radiative forcing over Hyderabad, India due to seasonal mesoscale and synoptic‐scale processes

Cited by 45 publications

References 90 publications

Carbonaceous aerosols and pollutants over Delhi urban environment: Temporal evolution, source apportionment and radiative forcing

Carbonaceous aerosols and pollutants over Delhi urban environment: Temporal evolution, source apportionment and radiative forcing

Fog-Induced Changes in Optical and Physical Properties of Transported Aerosols over Sundarban, India

Quantification of mass concentrations aerosols PM2.5 in primary schools. Case study: Tiaret city (Algeria)

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