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- Mukunda M. Gogoi
- S. Suresh Babu
- B. S. Arun
- K. Krishna Moorthy
- P. Ajay
- Arun Suryavanshi
- Arup Borgohain
- Anirban Guha
- Atiba Shaikh
- Binita Pathak
- Biswadip Gharai
- Boopathy Ramasamy
- G. Balakrishnaiah
- Harilal B. Menon
- Jagdish Chandra Kuniyal
- Jayabala Krishnan
- K. Rama Gopal
- M. Maheswari
- Manish Naja
- Parminder Kaur
- Pradip K. Bhuyan
- Pratima Gupta
- Prayagraj Singh
- Priyanka Srivastava
- R. S. Singh
- Ranjit Kumar
- Shantanu Rastogi
- Shyam Sundar Kundu
- Sobhan Kumar Kompalli
- Subhasmita Panda
- Tandule Chakradhar Rao
- Trupti Das
- Yogesh Kant
- S. K. Satheesh
- G. Ilavazhagan
Journals
Year
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Ajay, A.
- Response of Ambient BC Concentration Across the Indian Region to the Nation-Wide Lockdown: Results from the ARFINET Measurements of ISRO-GBP
Abstract Views :410 |
PDF Views:121
Authors
Mukunda M. Gogoi
1,
S. Suresh Babu
1,
B. S. Arun
1,
K. Krishna Moorthy
2,
A. Ajay
3,
P. Ajay
4,
Arun Suryavanshi
5,
Arup Borgohain
6,
Anirban Guha
7,
Atiba Shaikh
8,
Binita Pathak
4,
Biswadip Gharai
9,
Boopathy Ramasamy
10,
G. Balakrishnaiah
11,
Harilal B. Menon
8,
Jagdish Chandra Kuniyal
12,
Jayabala Krishnan
13,
K. Rama Gopal
11,
M. Maheswari
13,
Manish Naja
14,
Parminder Kaur
7,
Pradip K. Bhuyan
4,
Pratima Gupta
15,
Prayagraj Singh
16,
Priyanka Srivastava
14,
R. S. Singh
17,
Ranjit Kumar
15,
Shantanu Rastogi
16,
Shyam Sundar Kundu
6,
Sobhan Kumar Kompalli
1,
Subhasmita Panda
10,
Tandule Chakradhar Rao
11,
Trupti Das
10,
Yogesh Kant
18
Affiliations
1 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
4 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
5 Regional Remote Sensing Centre, Indian Space Research Organisation, Nagpur 440 033, IN
6 North Eastern – Space Application Centres, Shillong 793 103, IN
7 Department of Physics, Tripura University, Suryamaninagar, Agartala 799 022, IN
8 Department of Marine Sciences, Goa University, Goa 403 206, IN
9 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
10 Indian Institute of Mineral and Materials Technology, Bhubaneswar 751 013, IN
11 Sri Krishna Devaraya University, Anantapur 515 003, IN
12 G. B. Pant Institute of Himalayan Environment and Development, Kullu 175 126, IN
13 Tamil Nadu Agricultural University, Coimbatore 641 003, IN
14 Aryabhatta Research Institute of Observational Sciences, Nainital 263 002, IN
15 Department of Chemistry, Dayalbagh Educational Institute, Agra 282 005, IN
16 Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273 009, IN
17 Department of Chemical Engineering, IIT-BHU, Varanasi 221 005, IN
18 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN
1 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
4 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
5 Regional Remote Sensing Centre, Indian Space Research Organisation, Nagpur 440 033, IN
6 North Eastern – Space Application Centres, Shillong 793 103, IN
7 Department of Physics, Tripura University, Suryamaninagar, Agartala 799 022, IN
8 Department of Marine Sciences, Goa University, Goa 403 206, IN
9 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
10 Indian Institute of Mineral and Materials Technology, Bhubaneswar 751 013, IN
11 Sri Krishna Devaraya University, Anantapur 515 003, IN
12 G. B. Pant Institute of Himalayan Environment and Development, Kullu 175 126, IN
13 Tamil Nadu Agricultural University, Coimbatore 641 003, IN
14 Aryabhatta Research Institute of Observational Sciences, Nainital 263 002, IN
15 Department of Chemistry, Dayalbagh Educational Institute, Agra 282 005, IN
16 Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273 009, IN
17 Department of Chemical Engineering, IIT-BHU, Varanasi 221 005, IN
18 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 341-351Abstract
In this study, we assess the response of ambient aero-sol black carbon (BC) mass concentrations and spec-tral absorption properties across Indian mainland during the nation-wide lockdown (LD) in connection with the Coronavirus Disease 19 (COVID-19) pan-demic. The LD had brought near to total cut-off of emissions from industrial, traffic (road, railways, ma-rine and air) and energy sectors, though the domestic emissions remained fairly unaltered. This provided a unique opportunity to delineate the impact of fossil fuel combustion sources on atmospheric BC characte-ristics. In this context, the primary data of BC meas-ured at the national network of aerosol observatories (ARFINET) under ISRO-GBP are examined to assess the response to the seizure of emissions over distinct geographic parts of the country. Results indicate that average BC concentrations over the Indian mainland are curbed down significantly (10–40%) from pre-lockdown observations during the first and most in-tense phase of lockdown. This decline is significant with respect to the long-term (2015–2019) averaged (climatological mean) values. The drop in BC is most pronounced over the Indo-Gangetic Plain (>60%) and north-eastern India (>30%) during the second phase of lockdown, while significant reduction is seen during LD1 (16–60%) over central and peninsular Indian as well as Himalayan and sub-Himalayan regions. De-spite such a large reduction, the absolute magnitude of BC remained higher over the IGP and north-eastern sites compared to other parts of India. Notably, the spectral absorption index of aerosols changed very little over most of the locations, indicating the still persisting contribution of fossil-fuel emissions over most of the locations.Keywords
ARFINET, Black Carbon, COVID-19.References
- Ramanathan, V. and Carmichael, G., Global and regional climate changes due to black carbon. Nat. Geosci., 2008, 1, 221–227.
- Bond, T. C. et al., Bounding the role of black carbon in the cli-mate system: a scientific assessment. J. Geophys. Res. Atmos., 2013, 118, 5380–5552; doi:10.1002/jgrd.50171.
- Gogoi, M. M. et al., Radiative effects of absorbing aerosols over north-eastern India: observations and model simulations. J. Ge-ophys. Res. Atmos., 2017, 122(2), 1132–1157; doi:10.1002/ 2016JD025592.
- Li, G. L., Sun, L., Ho, K. F., Wong, K. C. and Ning, Z., Implica-tion of light absorption enhancement and mixing state of black carbon (BC) by coatings in Hong Kong. Aerosol Air Qual. Res., 2018, 18, 2753e2763.
- Lack, D. A., Moosmüller, H., McMeeking, G. R., Chakrabarty, R. K. and Baumgardner, D., Characterizing elemental, equivalent black, and refractory black carbon aerosol particles: a review of techniques, their limitations and uncertainties. Anal. Bioanal. Chem., 2014; doi:10.1007/s00216-013-7402-3.
- Weingartner, E., Saathof, H., Schnaiter, M., Streit, N., Bitnar, B. and Baltensperger, U., Absorption of light by soot particles: determination of the absorption coefficient by means of Ae-thalometers. J. Aerosol Sci., 2003, 34, 1445–1463; doi:10.1016/S0021-8502(03)00359-8.
- Drinovec, L. et al., The ‘dual-spot’ Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation. Atmos. Meas. Tech., 2015, 8, 1965–1979; doi: 10.5194/amt-8-1965-2015.
- Moorthy, K. K., Babu, S. S., Sunilkumar, S. V., Gupta, P. K. and Gera, B. S., Altitude profiles of aerosol BC, derived from aircraft measurements over an inland urban location in India. Geophys. Res. Lett., 2004; doi:10.1029/2004GL021336. L1B2103.
- Babu, S. S. et al., High altitude (~4520 m amsl) measurements of black carbon aerosols over western trans-Himalayas: seasonal heterogeneity and source apportionment. J. Geophys. Res. Atmos., 2011, 116(24), 1–15; doi:10.1029/2011JD016722.
- Gogoi, M. M. et al., Physical and optical properties of aerosols in a free tropospheric environment: Results from long-term observa-tions over western trans-Himalayas. Atmos. Environ., 2014, 84, 262–274.
- Arun, B. S., Aswini, A. R., Gogoi, M. M., Hegde, P., Kompalli, S. K., Sharma, P. and Babu, S. S., Physico-chemical and optical properties of aerosols at a background site (~4 km a.s.l.) in the western Himalayas. Atmos. Environ., 2019, doi:10.1016/j. atmosenv.2019.1170.
- Lau, K. M., Kim, M. K. and Kim, K. M., Aerosol induced anoma-lies in the Asian summer monsoon – the role of the Tibetan Plat-eau. Clim. Dyn., 2006, 26, 855–864; doi:10.1007/s00382-006-0114-z.
- Jain, S. and Sharma, T., Social and travel lockdown impact con-sidering coronavirus disease (COVID-19) on air quality in mega-cities of India: present benefits, future challenges and way for-ward. Aerosol Air Qual. Res., 2020; doi:10.4209/aaqr.2020. 04.0171.
- Mahato, S., Pal, S. and Ghosh, K. G., Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India. Sci. Total Environ., 2020; doi:10.1016/j.scitotenv.2020.139086.
- Sharma, S., Zhang, M., Anshika, Gao, J., Zhang, H. and Kota, S. H., Effect of restricted emissions during COVID-19 on air quality in India. Sci. Total Environ., 2020; doi:10.1016/j.scitotenv. 2020.138878.
- Bao, R. and Zhang, A., Does lockdown reduce air pollution? Evi-dence from 44 cities in northern China. Sci. Total Environ., 2020; doi:10.1016/j.scitotenv.2020.139052.
- Saadat, S., Rawtani, D. and Hussain, C. M., Environmental per-spective of COVID-19. Sci. Total Environ., 2020; doi:10.1016/ j.scitotenv.2020.138870.
- Xu, K., Cui, K., Young, L. H., Hsieh, Y. K., Wang, Y. F., Zhang, J. and Wan, S., Impact of the COVID-19 event on air quality in central China. Aerosol Air Qual. Res., 2020, 20, 915–929; doi: 10.4209/aaqr.2020.04.0150.
- Nakada, L. Y. K. and Urban, R. C., COVID-19 pandemic: Impacts on the air quality during the partial lockdown in São Paulo state, Brazil. Sci. Total Environ., 2020, 730, 139087; doi:10.1016/ j.scitotenv.2020.139087.
- Tobías, A. et al., Changes in air quality during the lockdown in Barcelona (Spain) one month into the SARS-CoV-2 epidemic. Sci. Total Environ., 2020, 726, 138540; doi:10.1016/j.scitotenv. 2020.138540.
- Otmani, A., Benchrif, A., Tahri, M., Bounakhla, M., Chakir, E. M., Bouch, M. E. and Krombi, M., Impact of COVID-19 lockdown on PM10, SO2 and NO2 concentrations in Salé City (Morocco). Sci. Total Environ., 2020; doi:10.1016/j.scitotenv. 2020.139541.
- Monserrate, M. A. Z. and Ruano, M. A., Has air quality improved in Ecuador during the COVID-19 pandemic? A parametric analy-sis. Air Quality Atmos. Health, 2020; doi:10.1007/s11869-020-00866-y.
- Bauwens, M. et al., Impact of coronavirus outbreak on NO2 pollu-tion assessed using TROPOMI and OMI observations. Geophys. Res. Lett., 2020; doi:10.1029/2020GL087978.
- Sicard, P. et al., Amplified ozone pollution in cities during the COVID-19 lockdown. Sci. Total Environ., 2020; doi:10.1016/ j.scitotenv.2020.139542.
- Schnaiter, M., Horvath, H., Mohler, O., Naumann, K.-H., Saatho, H. and Schock, O. W., UV-VIS-NIR spectral optical properties of soot and soot-containing aerosols. J. Aerosol Sci., 2003, 34, 1421–1444.
- Kirchstetter, T. W. and Novakov, T., Evidence that the spectral dependence of light absorption by aerosols is affected by organic carbon. J. Geophys. Res., 2004, 109, D21208; doi:10.1029/ 2004JD004999.
- Clarke, A. et al., Biomass burning and pollution aerosol over North America: Organic components and their influence on spec-tral optical properties and humidification response. J. Geophys. Res., 2007, 112, D12S18; doi:10.1029/2006JD007777.
- Kuniyal, J. C., Sharma, M., Chand, K. and Mathela, C. S., Water soluble ionic components in particulate matter (PM10) during high pollution episode days at Mohal and Kothi in the North-Western Himalaya, India. Aerosol Air Qual. Res., 2015, 15, 529–543.
- Joshi, H., Naja, M., David, L. M., Gupta, T., Gogoi, M. M. and Babu, S. S., Absorption characteristics of aerosols over the central Himalayas and its adjacent foothills. Atmos. Res., 2019, 233, 104718; doi:10.1016/j.atmosres.2019.104718.
- Dumka., U. C., Manchanda, R. K., Sinha, P. R., Sreenivasan, S., Moorthy, K. K. and Babu, S. S., Temporal variability and radia-tive impact of black carbon aerosol over tropical urban station Hyderabad. J. Atmos. Sol. Terr. Phys., 2013; doi:10.1016/ j.jastp.2013.08.003.
- Pandey, S. K. and Vinoj, V., Surprising increase in aerosol amid widespread decline in pollution over India during the Covid19 Lockdown, EarthArXiv., 2020; doi:10.31223/osf.io/5kmx2.
- Kumar, R. et al., Sources of black carbon aerosols in South Asia and surrounding regions during the integrated campaign for aero-sols, gases and radiation budget (ICARB). Atmos. Chem. Phys., 2015, 15(10), 5415–5428; doi:10.5194/acp-15-5415-2015.
- Impact Assessment of Change in Anthropogenic Emissions Due to Lockdown On Aerosol Characteristics In A Rural Location
Abstract Views :330 |
PDF Views:104
Authors
Affiliations
1 Hindustan Institute of Technology and Science, Chennai 603 103, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Hindustan Institute of Technology and Science, Chennai 603 103, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 332-340Abstract
Long-term and continuous measurements of aerosol concentration and optical properties from the Challakere Climate Observatory, located in a remote rural semi-arid region northwest of Bengaluru, are examined for the impact of the prolonged and phased national lockdown during the COVID-19 pandemic. The analyses revealed that the lockdown, which almost brought all the anthropogenic activities (particularly associated with fossil fuel use such as in transport and industrial sectors) to a standstill and then slowly relaxed in phases, had very little impact on the aerosol properties at this remote site, in sharp contrast to the impacts seen in the major urban conglomerate, Bengaluru, located about 230 km southeast to Challakere. Rather than impacts from anthropogenic sources associated with fossil fuel combustion, the aerosol characteristics at Challakere are strongly influenced by regional and synoptic meteorology. The findings re-emphasize that the emissions from fossil fuel combustion in industrial and automobile sector are the major source of aerosols (especially absorbing type) over urban and semi-urban environments.Keywords
Anthropogenic Emissions, Black Carbon, COVID-19 Lockdown, Rural Aerosols, Scattering Coefficients, Single Scattering Albedo.References
- Babu, S. S. and Moorthy, K. K., Anthropogenic impact on aerosol black carbon mass concentration at a tropical coastal station: a case study. Curr. Sci., 2001, 81, 1208–1214.
- Beegum, S. N. et al., Spatial distribution of aerosol black carbon over India during pre-monsoon season. Atmos. Environ., 2009, 43, 1071–1078.
- Badarinath, K. V. S. et al., Variations in black carbon aerosol, carbon monoxide and ozone over an urban area of Hyderabad, India, during the forest fire season. Atmos. Res., 2007, 85, 18– 26.
- Pathak, B. et al., Firework induced large increase in trace gases and black carbon at Dibrugarh, India. J. Earth Sci. Eng., 2013, 3, 540.
- Gogoi, M. M., Bhuyan, P. K. and Krishna Moorthy, K., Possible impact of a major oil-well fire on aerosol optical depth at Dibrugarh. Curr. Sci., 2007, 92, 1047–1049.
- Yerramsetti, V. S. et al., The impact assessment of Diwali fireworks emissions on the air quality of a tropical urban site, Hyderabad, India, during three consecutive years. Environ. Monitoring Assess., 2013, 185, 7309–7325.
- Ganguly, N. D. et al., Analysis of a severe air pollution episode in India during Diwali festival – a nationwide approach. Atmósfera, 2019, 32, 225–236.
- Latha, K. M., Badarinath, K. V. S. and Krishna Moorthy, K., Impact of diesel vehicular emissions on ambient black carbon concentration at an urban location in India. Curr. Sci., 2004, 86, 451–453.
- Sharma, A. R., Shailesh, K. K. and Badarinath, K. V. S., Influence of vehicular traffic on urban air quality – a case study of Hyderabad, India. Transp. Environ., 2010, 15, 154–159.
- Basagaña, X. et al., Effect of public transport strikes on air pollution levels in Barcelona (Spain). Sci. Total Environ., 2018, 610, 1076–1082.
- Hansen, A. D. A., Rosen, H. and Novakov, T., Real-time measurement of the absorption coefficient of aerosol particles. Appl. Opt., 1982, 21, 3060–3062.
- Hansen, A. D. A., Rosen, H. and Novakov, T., The aethalometer – an instrument for the real-time measurement of optical absorption by aerosol particles. Sci. Total Environ., 1984, 36, 191–196.
- Bond, T. C., Anderson, T. L. and Campbell, D., Calibration and intercomparison of filter-based measurements of visible light absorption by aerosols. Aerosol Sci. Technol., 1999, 30, 582–600.
- Kirchstetter, T. W., Novakov, T. and Hobbs, P. V., Evidence that the spectral dependence of light absorption by aerosols is affected by organic carbon. J. Geophys. Res., 2004, 109, D21208.
- Sandradewi, J. et al., A study of wood burning and traffic aerosols in an Alpine valley using a multi-wavelength Aethalometer. Atmos. Environ., 2008a, 42, 101–112.
- Sandradewi, J. et al., Using aerosol light absorption measurements for the quantitative determination of wood burning and traffic emission contributions to particulate matter. Environ. Sci. Technol., 2008b, 42, 3316–3323.
- Drinovec, L. et al., The ‘dual-spot’ Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation. Atmos. Meas. Tech., 2015, 8, 1965.
- Weingartner, E. et al., Absorption of light by soot particles: determination of the absorption coefficient by means of aethalometers. J. Aerosol Sci., 2003, 34, 1445–1463.
- Kleidman, R. et al., New capability for in situ measurements of particulate matter using size-selecting Nephelometers as part of the SPARTAN network. AGUFM, 2018, A13I–2558.
- Anderson, T. L. et al., Performance characteristics of a highsensitivity, three-wavelength, total scatter/backscatter nephelometer. J. Atmos. Oceanic Technol., 1996, 13, 967–986.
- Anderson, T. L. and Ogren, J. A., Determining aerosol radiative properties using the TSI 3563 integrating nephelometer. Aerosol Sci. Technol., 1998, 29, 57–69.
- Anand, N. et al., Entanglement of near-surface optical turbulence to atmospheric boundary layer dynamics and particulate concentration: implications for optical wireless communication systems. Appl. Opt., 2020, 59, 1471–1483.
- Ajay, A., Krishna Moorthy, K., Satheesh, S. K. and Ilavazhagan, G., Impact of lockdown-related reduction in anthropogenic emissions on aerosol characteristics in the megacity, Bengaluru. Curr. Sci., 2021, 120(2), 287–295.
- Satheesh, S. K., Vinoj, V. and Krishna Moorthy, K., Radiative effects of aerosols at an urban location in southern India: observations versus model. Atmos. Environ., 2010, 44, 5295–5304.
- Wiscombe, W. J. and Grams, G. W., The backscattered fraction in two-stream approximations. J. Atmos. Sci., 1976, 33, 2440–2451.
- Andrews, E. et al., Comparison of methods for deriving aerosol asymmetry parameter. J. Geophys. Res., 2006, 111, D05S04.
- Satheesh, S. K. et al., Unusual aerosol characteristics at Challakere in Karnataka. Curr. Sci., 2013, 104, 615.
- Impact of Lockdown-Related Reduction in Anthropogenic Emissions on Aerosol Characteristics in the Megacity, Bengaluru
Abstract Views :333 |
PDF Views:126
Authors
Affiliations
1 Hindustan Institute of Technology and Science, Chennai 603 103, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Hindustan Institute of Technology and Science, Chennai 603 103, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 287-295Abstract
Continuous analytical measurements of the loading and optical properties of near-surface aerosols over the megacity Bengaluru, in south India, are examined for the impact of the national lockdown (LD) associated with COVID-19 pandemic. The near total shutdown of rail, road, and air traffic as well as total closure of most of the business establishments and IT industry, especially during the first phase of the LD, is found to dramatically reduce black carbon (BC) abundance. Within one week of the first week of the LD phase 1 (LD1), the ambient BC concentration at the urban centre came down to levels comparable to those reported for remote rural locations, primarily due to >60% reduction in BC from fossil fuel (BCff) emissions. On the other hand, BC from biomass burning (BCwb) did not show any conspicuous impact. Consequently, the fraction of BCwb to BC more than doubled and the spectral absorption coefficient increased from ~1.15 to ~1.4. The single scattering albedo increased from its prevailing mean value 0.66 before LD to 0.74 during LD1 and then gradually decreased to 0.68 with increasing relaxations on vehicular traffic. The results reveal the unequivocal role of vehicular emissions in impacting the aerosol loading and their optical properties over Bengaluru. The study also shows how the environment responded to the gradual relaxations in the subsequent phases of LD. It is interesting to note that a few spells of strong rainfall towards the fourth phase of the LD impacted the aerosols non-selectively leading to sharp decrease in all the quantities. However, owing to the non-selective nature of the washout this large reduction in loading did not impact the single scattering albedo, unlike the case with the LD.Keywords
Black Carbon, COVID-19 Lockdown, Scattering Coefficients, Single Scattering Albedo.References
- IPCC, Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (eds Stocker, T., Dahe, Q. and Plattner, G.-K.), Cambridge University Press, Cambridge, 2013.
- Jacobson, M. Z., Control of fossil-fuel particulate black carbon and organic matter, possibly the most effective method of slowing global warming. J. Geophys. Res., 2002, 107(D19), 4410; http://dx.doi.org/10.1029/2001JD001376.
- Ramanathan, V. and Carmichael, G., Global and regional climate changes due to black carbon. Nature, 2008, 221–227; http://dx. doi.org/10.1038/ngeo156.
- Babu, S. S. and Moorthy, K. K., Aerosol black carbon over a tropical coastal station in India. Geophys. Res. Lett., 2002, 29(23), 13-11–13-14; doi:10.1029/2002gl015662.
- Latha, K., Badrinath, K. V. S. and Moorthy, K. K., Impact of diesel vehicular emissions on ambient black carbon concentration at an urban location in India. Curr. Sci., 2004, 86(3), 451–453.
- Satheesh, S. K., Vinoj, V. and Moorthy, K. K., Weekly periodicities of aerosol properties observed at an urban location in India. Atmos. Res., 2011, 101(1–2), 307–313; doi:10.1016/j.atmosres. 2011.03.003.
- Hansen, A. D. A., Rosen, H. and Novakov, T., The aethalometer – an instrument for the real-time measurement of optical absorption by aerosol particles. Sci. Total Environ., 1984, 36, 191–196.
- Sandradewi, J., Prévôt, A. S. H., Weingartner, E., Schmidhauser, R., Gysel, M. and Altensperger, U., A study of wood burning and traffic aerosols in an Alpine valley using a multi-wavelength aethalometer. Atmos. Environ., 2008, 42, 101–112.
- Drinovec, L., Močnik, G., Zotter, P., Prévôt, A. S. H., Ruckstuhl, C., Coz, E. and Hansen, A. D. A., The ‘dual-spot’ Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation. Atmos. Meas. Tech., 2015, 8(5), 1965– 1979; doi:10.5194/amt-8-1965-2015.
- Weingartner, E., Saathoff, H., Schnaiter, M., Streit, N., Bitnar, B. and Baltensperger, U., Absorption of light by soot particles: determination of the absorption coefficient by means of aethalometers. J. Aerosol Sci., 2003, 34(10), 1445–1463; doi:10.1016/s00218502(03)00359-8.
- Kirchstetter, T. W., Novakov, T. and Hobbs, P. V., Evidence that the spectral dependence of light absorption by aerosols is affected by organic carbon. J. Geophys. Res.: Atmosphere, 2004, 109(D21); http://dx.doi.org/10.1029/2004JD004999.
- Kleidman, R., Martins, J. V., Townsend, H. K., Hall, J., Gibson, M. D. and Martin, R., New capability for in situ measurements of particulate matter using size-selecting nephelometers as part of the SPARTAN network. Paper presented at the AGU Fall Meeting Abstracts, 2018; https://ui.adsabs.harvard.edu/abs/2018AGUFM. A13I2558K
- Anderson, T. L. and Ogren, J. A., Determining aerosol radiative properties using the TSI 3563 integrating nephelometer. Aerosol Sci. Technol., 1998, 29(1), 57–69; doi:10.1080/02786829808965551.
- Jethva, H. T., Satheesh, S. K., Srinivasan, J. and Krishnamoorthy, K., How good is the assumption about visible surface reflectance in MODIS aerosol retrieval over land? A comparison with aircraft measurements over an urban site in India. IEEE Trans. Geosci. Rem. Sens., 2009, 47(7), 10.1109/TGRS.2008.2010221.
- Anand, N., Sunilkumar, K., Satheesh, S. K. and Krishna Moorthy, K., Entanglement of near-surface optical turbulence to atmospheric boundary layer dynamics and particulate concentration: implications for optical wireless communication systems. Appl. Opt., 2020, 59(5), 1471; doi:10.1364/ao.381737.
- Moosmüller, H., Chakrabarty, R. K., Ehlers, K. M. and Arnott, W. P., Absorption Ångström coefficient, brown carbon, and aerosols: basic concepts, bulk matter, and spherical particles. Atmos. Chem. Phys., 2011, 11(3), 1217–1225; doi:10.5194/acp-11-1217-2011.
- Sandradewi, J. et al., Using aerosol light absorption measurements for the quantitative determination of wood burning and traffic emission contributions to particulate matter. Environ. Sci. Technol., 2008, 42, 3316–3323; doi:10.1021/es702253m.
- Ångström, A., The parameters of atmospheric turbidity. Tellus, 1964, 16, 64–75.
- Stull, R. B., An Introduction to Boundary Layer Meteorology, Kluwer, Dordrecht, 1988, p. 666; http://dx.doi.org/10.1007/97894-009-3027-8
- Babu, S. S. and Moorthy, K. K., Anthropogenic impact on aerosol black carbon mass concentration at a tropical coastal station: a case study. Curr. Sci., 2001, 81(9), 1208–1214.
- Nair, V. S. et al., Wintertime aerosol characteristics over the IndoGangetic Plain (IGP): impacts of local boundary layer processes and long-range transport. J. Geophys. Res., 2007, 112, D13205; http://dx.doi.org/10.1029/2006 JD008099.
- Andrews, E. et al., Comparison of methods for deriving aerosol asymmetry parameter. J. Geophys. Res., 2006, 111, D05S04; doi:10.1029/2004JD005734
- Wiscombe, W. J. and Grams, G., The backscattered fraction in two-stream approximations. J. Atmos. Sci., 1976, 33, 2440e2451.