Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign
<p>Measurements of the vertical profiles of the optical properties (namely the extinction coefficient and scattering and absorption coefficients respectively <span class="inline-formula"><i>σ</i><sub>ext</sub></span> <span class="...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/17669/2018/acp-18-17669-2018.pdf |
| _version_ | 1818155143347044352 |
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| author | A. Vaishya A. Vaishya S. N. S. Babu V. Jayachandran M. M. Gogoi N. B. Lakshmi K. K. Moorthy S. K. Satheesh S. K. Satheesh |
| author_facet | A. Vaishya A. Vaishya S. N. S. Babu V. Jayachandran M. M. Gogoi N. B. Lakshmi K. K. Moorthy S. K. Satheesh S. K. Satheesh |
| author_sort | A. Vaishya |
| collection | DOAJ |
| description | <p>Measurements of the vertical profiles of the optical properties (namely the extinction
coefficient and scattering and absorption coefficients respectively
<span class="inline-formula"><i>σ</i><sub>ext</sub></span> <span class="inline-formula">∕</span> <span class="inline-formula"><i>σ</i><sub>scat</sub></span> <span class="inline-formula">∕</span> <span class="inline-formula"><i>σ</i><sub>abs</sub></span>)
of aerosols have been made across the Indo-Gangetic Plain (IGP) using an
instrumented aircraft operated from three base stations – Jodhpur (JDR),
representing the semi-arid western IGP; Varanasi (VNS), the central IGP
characterized by significant anthropogenic activities; and the industrialized
coastal location in the eastern end of the IGP (Bhubaneswar, BBR) – just
prior to the onset of the Indian summer monsoon. The vertical profiles
depicted region-specific absorption characteristics, while the scattering
characteristics remained fairly uniform across the region, leading to a
west–east gradient in the vertical structure of single-scattering
albedo (SSA). Integrated from near the ground to 3 km, the highest
absorption coefficient and hence the lowest SSA occurred in the central IGP
(Varanasi). Size distribution, inferred from the spectral variation of the
scattering coefficient, showed a gradual shift from coarse-particle dominance
in the western IGP to strong accumulation dominance in the eastern coast with
the central IGP coming in between, arising from a change in the aerosol type
from a predominantly natural (dust and sea salt) type in the western IGP to a
highly anthropogenic type (industrial emissions, fossil fuel and biomass
combustion) in the eastern IGP, with the central IGP exhibiting a mixture of
both. Aerosol-induced short-wave radiative forcing, estimated using
altitude-resolved SSA information, revealed significant atmospheric warming
in the central IGP, while a top-of-atmosphere cooling is seen, in general, in
the IGP. Atmospheric heating rate profiles, estimated using altitude-resolved
SSA and column-averaged SSA, revealed considerable underestimation in the
latter case, emphasizing the importance and necessity of having
altitude-resolved SSA information as against a single value for the entire
column.</p> |
| first_indexed | 2024-12-11T14:37:43Z |
| format | Article |
| id | doaj.art-34c61cd0ac6b4362887ae116be70b689 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-11T14:37:43Z |
| publishDate | 2018-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-34c61cd0ac6b4362887ae116be70b6892022-12-22T01:02:04ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-12-0118176691768510.5194/acp-18-17669-2018Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaignA. Vaishya0A. Vaishya1S. N. S. Babu2V. Jayachandran3M. M. Gogoi4N. B. Lakshmi5K. K. Moorthy6S. K. Satheesh7S. K. Satheesh8Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO PO, Thiruvananthapuram, Indianow at: School of Arts and Sciences, Ahmedabad University, Ahmedabad, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre, ISRO PO, Thiruvananthapuram, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre, ISRO PO, Thiruvananthapuram, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre, ISRO PO, Thiruvananthapuram, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre, ISRO PO, Thiruvananthapuram, IndiaCentre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, IndiaCentre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, IndiaDivecha Centre for Climate Change, Indian Institute of Science, Bangalore, India<p>Measurements of the vertical profiles of the optical properties (namely the extinction coefficient and scattering and absorption coefficients respectively <span class="inline-formula"><i>σ</i><sub>ext</sub></span> <span class="inline-formula">∕</span> <span class="inline-formula"><i>σ</i><sub>scat</sub></span> <span class="inline-formula">∕</span> <span class="inline-formula"><i>σ</i><sub>abs</sub></span>) of aerosols have been made across the Indo-Gangetic Plain (IGP) using an instrumented aircraft operated from three base stations – Jodhpur (JDR), representing the semi-arid western IGP; Varanasi (VNS), the central IGP characterized by significant anthropogenic activities; and the industrialized coastal location in the eastern end of the IGP (Bhubaneswar, BBR) – just prior to the onset of the Indian summer monsoon. The vertical profiles depicted region-specific absorption characteristics, while the scattering characteristics remained fairly uniform across the region, leading to a west–east gradient in the vertical structure of single-scattering albedo (SSA). Integrated from near the ground to 3 km, the highest absorption coefficient and hence the lowest SSA occurred in the central IGP (Varanasi). Size distribution, inferred from the spectral variation of the scattering coefficient, showed a gradual shift from coarse-particle dominance in the western IGP to strong accumulation dominance in the eastern coast with the central IGP coming in between, arising from a change in the aerosol type from a predominantly natural (dust and sea salt) type in the western IGP to a highly anthropogenic type (industrial emissions, fossil fuel and biomass combustion) in the eastern IGP, with the central IGP exhibiting a mixture of both. Aerosol-induced short-wave radiative forcing, estimated using altitude-resolved SSA information, revealed significant atmospheric warming in the central IGP, while a top-of-atmosphere cooling is seen, in general, in the IGP. Atmospheric heating rate profiles, estimated using altitude-resolved SSA and column-averaged SSA, revealed considerable underestimation in the latter case, emphasizing the importance and necessity of having altitude-resolved SSA information as against a single value for the entire column.</p>https://www.atmos-chem-phys.net/18/17669/2018/acp-18-17669-2018.pdf |
| spellingShingle | A. Vaishya A. Vaishya S. N. S. Babu V. Jayachandran M. M. Gogoi N. B. Lakshmi K. K. Moorthy S. K. Satheesh S. K. Satheesh Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign Atmospheric Chemistry and Physics |
| title | Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign |
| title_full | Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign |
| title_fullStr | Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign |
| title_full_unstemmed | Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign |
| title_short | Large contrast in the vertical distribution of aerosol optical properties and radiative effects across the Indo-Gangetic Plain during the SWAAMI–RAWEX campaign |
| title_sort | large contrast in the vertical distribution of aerosol optical properties and radiative effects across the indo gangetic plain during the swaami rawex campaign |
| url | https://www.atmos-chem-phys.net/18/17669/2018/acp-18-17669-2018.pdf |
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