Seasonal variation of black carbon aerosols over a tropical urban city of Pune, India

Safai, P.D.; Kewat, S.; Praveen, P. S.; Rao, P. S. P.; Momin, G. A.; Ali, Kaushar; Devara, P. C. S.

doi:10.1016/j.atmosenv.2006.11.044

Cited by 140 publications

(59 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The evening peak could be a double way effect by enhanced traffic emissions due to after work hours and the trapping of pollutants as a result of the temperature inversions and lowering of boundary layer. Similar diurnal variation of PM 2.5 /BC was reported by many investigators over different Indian regions (Ramachandran et al, 2007;Reddy et al, 2007;Safai et al, 2007).…”

Section: Variation Of Particulate Mattersupporting

confidence: 68%

“…PM 2.5 showed highest peak of 142 µg m -3 over UDPR and was up to 112 µg m -3 over JBL. The morning peak mainly is attributed to meteorology, as the particles gets lifted up due to the breakup of nocturnal boundary layer by solar heating (Safai et al, 2007). The evening peak could be a double way effect by enhanced traffic emissions due to after work hours and the trapping of pollutants as a result of the temperature inversions and lowering of boundary layer.…”

Section: Variation Of Particulate Mattermentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Particulate Matter and Carbonaceous Aerosol over Two Urban Environments in Northern India

Panicker

Ali

Beig

et al. 2015

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Monitoring and simultaneous sampling of Particulate matter (PM 10 and PM 2.5 ) was carried out for the first time over two urban sites in Northern India (Jabalpur and Udaipur) during December 2010-November 2012 (up to August 2012 over Udaipur). The samples of PM 2.5 were analyzed for elemental carbon (EC) and organic carbon (OC) using advanced DRI Thermal optical carbon Analyzer. The monthly mean PM 10 values were as high as 149 ± 44 µg m -3 over Jabalpur (JBL) and 171 ± 42.2 µg m -3 over Udaipur (UDPR). PM 2.5 mass over JBL varied between 25-79 µg m -3 and over UDPR between 24-82 µg m -3. The monthly mean OC concentration varied from 12.5 ± 7.3 µg m -3 to 28.4 ± 10.7 µg m -3 over JBL and from 7.8 ± 2.9 to 39.7 ± 11.6 µg m -3 over UDPR. The variation of monthly mean EC concentration was from 3.9-10.3 µg m -3 over JBL and from 3-10.9 µg m -3 over UDPR. The contribution of TC to PM 2.5 was in the range of 31-75% over JBL and 30-83% over UDPR. The EC showed higher concentration in winter and minimal values in monsoon. The OC/EC ratio showed low variation over JBL compared to that over UDPR suggesting spectrum of sources responsible for EC and OC components over UDPR. Formation of secondary organic carbon (SOC) was also recognized as a potential component altering OC/EC ratio. Up on extracting the sub fractions, it is found that OC2 and OC3 are the major component over both the sites contributing up to 51% to the total OC in different months. EC1 (EC component derived at 580°C) was found to be the major EC component contributing up to 79% over the sites.

show abstract

Section: Variation Of Particulate Mattersupporting

confidence: 68%

Section: Variation Of Particulate Mattermentioning

confidence: 99%

Characterization of Particulate Matter and Carbonaceous Aerosol over Two Urban Environments in Northern India

Panicker

Ali

Beig

et al. 2015

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…Figure 3(a) and (b) shows the diurnal variation of BC aerosol mass concentration over urban and rural area of Hyderabad (Figure 3(a)) and Anantapur (Figure 3(b)) for the month of August 2006. The study period corresponds to monsoon season over the region and the lower BC concentrations at both measurement sites are mainly due to scavenging effects of precipitation (Safai et al, 2007). The monthly average BC concentration at Hyderabad during the month of August, was ∼12 µg m −3 , which is higher than that reported for other city, Pune (∼1.6 µg m −3 ) in India (Safai et al, 2007), due to higher influence vehicular and industrial emissions.…”

Section: Datasets and Methodologycontrasting

confidence: 44%

“…The study period corresponds to monsoon season over the region and the lower BC concentrations at both measurement sites are mainly due to scavenging effects of precipitation (Safai et al, 2007). The monthly average BC concentration at Hyderabad during the month of August, was ∼12 µg m −3 , which is higher than that reported for other city, Pune (∼1.6 µg m −3 ) in India (Safai et al, 2007), due to higher influence vehicular and industrial emissions. The monthly average BC concentration at rural site of Anantapur was ∼0.85 µg m −3 , which is less compared to other urban locations like Hyderabad, Delhi, Kanpur, Pune and Visakhapatnam in India.…”

Section: Datasets and Methodologycontrasting

confidence: 44%

“…Biomass burning for agricultural purposes and domestic purposes from the Indo-Gangetic Plain regions has been reported to be the major source for BC emissions (Venkatraman et al, 2005). However, there are very few data available on BC aerosols from the Indian region though some studies (Latha and Badarinath, 2003;Latha et al, 2004;Tripathi et al, 2005;Ramachandran and Rajesh, 2007;Safai et al, 2007;Sreekanth et al, 2007) have reported on the characteristics of BC over the Indian region.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Black carbon aerosol mass concentration variation in urban and rural environments of India—a case study

Badarinath

Kharol

Reddy

et al. 2009

Atmospheric Science Letters

View full text Add to dashboard Cite

The present study provides an account of the black carbon (BC) aerosol mass concentration variation in contrasting environments of India corresponding to the urban and rural areas of Hyderabad and Anantapur during August 2006. The study period corresponds to the monsoon season over the Indian region. The diurnal variation of BC showed two peaks, during morning and late evening, which are mostly, related to the diurnal changes in the local boundary layer and traffic density patterns. BC mass concentrations over Hyderabad are estimated to be 92% higher compared to those at the Anantapur site suggesting considerable contrast in its spatial variations.

show abstract

Elevated aerosol layers and their radiative impact over Kanpur during monsoon onset period

et al. 2016

View full text Add to dashboard Cite

Accurate information about aerosol vertical distribution is needed to reduce uncertainties in aerosol radiative forcing and its effect on atmospheric dynamics. The present study deals with synergistic analyses of aerosol vertical distribution and aerosol optical depth (AOD) with meteorological variables using multisatellite and ground‐based remote sensors over Kanpur in central Indo‐Gangetic Plain (IGP). Micro‐Pulse Lidar Network‐derived aerosol vertical extinction (σ) profiles are analyzed to quantify the interannual and daytime variations during monsoon onset period (May–June) for 2009–2011. The mean aerosol profile is broadly categorized into two layers viz., a surface layer (SL) extending up to 1.5 km (where σ decreased exponentially with height) and an elevated aerosol layer (EAL) extending between 1.5 and 5.5 km. The increase in total columnar aerosol loading is associated with relatively higher increase in contribution from EAL loading than that from SL. The mean contributions of EALs are about 60%, 51%, and 50% to total columnar AOD during 2009, 2010, and 2011, respectively. We observe distinct parabolic EALs during early morning and late evening but uniformly mixed EALs during midday. The interannual and daytime variations of EALs are mainly influenced by long‐range transport and convective capacity of the local emissions, respectively. Radiative flux analysis shows that clear‐sky incoming solar radiation at surface is reduced with increase in AOD, which indicates significant cooling at surface. Collocated analysis of atmospheric temperature and aerosol loading reveals that increase in AOD not only resulted in surface dimming but also reduced the temperature (∼2–3°C) of lower troposphere (below 3 km altitude). Radiative transfer simulations indicate that the reduction of incoming solar radiation at surface is mainly due to increased absorption by EALs (with increase in total AOD). The observed cooling in lower troposphere in high aerosol loading scenario could be understood as a dynamical feedback of EAL‐induced stratification of lower troposphere. Further, the observed radiative effect of EALs increases the stability of the lower troposphere, which could modulate the large‐scale atmospheric dynamics during monsoon onset period. These findings encourage follow‐up studies on the implication of EALs to the Indian summer monsoon dynamics using numerical models.

show abstract

Seasonal variation of black carbon aerosols over a tropical urban city of Pune, India

Cited by 140 publications

References 26 publications

Characterization of Particulate Matter and Carbonaceous Aerosol over Two Urban Environments in Northern India

Characterization of Particulate Matter and Carbonaceous Aerosol over Two Urban Environments in Northern India

Black carbon aerosol mass concentration variation in urban and rural environments of India—a case study

Elevated aerosol layers and their radiative impact over Kanpur during monsoon onset period

Contact Info

Product

Resources

About