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Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields

Aerosol climatology during typical haze dominating period over South and Southeast Asia was explored using several Earth-Observing A-Train satellite products retrieved in between 2010 and 2020. Comparatively high aerosol optical depth (AOD) with dominance of fine and UV-absorbing aerosols are noted...

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Main Authors: Banerjee, Tirthankar, Shitole, A. S., Mhawish, Alaa, Anand, A., Ranjan, R., Khan, Md Firoz, Srithawirat, T., Latif, Mohd T., Mall, R. K.
Format: Article
Published: Amer Geophysical Union 2021
Subjects:
QB Astronomy
QC Physics
QD Chemistry
Online Access:http://eprints.um.edu.my/34152/
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spelling my.um.eprints.341522022-06-20T07:09:59Z http://eprints.um.edu.my/34152/ Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields Banerjee, Tirthankar Shitole, A. S. Mhawish, Alaa Anand, A. Ranjan, R. Khan, Md Firoz Srithawirat, T. Latif, Mohd T. Mall, R. K. QB Astronomy QC Physics QD Chemistry Aerosol climatology during typical haze dominating period over South and Southeast Asia was explored using several Earth-Observing A-Train satellite products retrieved in between 2010 and 2020. Comparatively high aerosol optical depth (AOD) with dominance of fine and UV-absorbing aerosols are noted across the Indo-Gangetic plain, South Asia (IGP; AOD: 0.58; UVAI: 0.74) against weak UV-absorbing fine aerosols over Southeast Asia (SEA; AOD: 0.26; UVAI: 0.07). Among inland IGP sites, decadal mean AOD resembles in Lahore (0.72 +/- 0.45), Delhi (0.81 +/- 0.46), Kanpur (0.84 +/- 0.42), and Varanasi (0.78 +/- 0.45); all exhibiting bimodal AOD distribution with a first peak in early November followed by a second in early January. In contrast, except mainland site Chiang Mai, all SEA maritime cities resemble in having typical September-October AOD peak, with the presence of fine and UV-neutral aerosols. Urban hotspots across IGP and SEA (except Dhaka, Chiang Mai) denote a spatially consistent minor increasing trend in AOD (0.2-1.8 x 10(-2) year(-1)) while increase in UVAI is more prominent over upper IGP. Dust aerosols dominate only in Karachi (46%) against strong UV-absorbing smoke aerosols over rest of the IGP (71-91%), and UV-neutral smoke aerosols across SEA (84-92%). Vertical stratification of aerosol types is noted across IGP as in lower atmosphere (<4 km) polluted dust/urban aerosols remain abundant, with gradual decrease in dust aerosols from upper to lower IGP and consequent increase in smoke aerosols. At upper atmosphere (>4 km), however, dust aerosols clearly dominate. Over SEA, smoke are the most abundant aerosols across the atmospheric column followed by polluted dust. No evidence of intracontinental transport of aerosols from IGP to Southeast Asia or vice versa is, however, noted. Amer Geophysical Union 2021-03-27 Article PeerReviewed Banerjee, Tirthankar and Shitole, A. S. and Mhawish, Alaa and Anand, A. and Ranjan, R. and Khan, Md Firoz and Srithawirat, T. and Latif, Mohd T. and Mall, R. K. (2021) Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields. Journal of Geophysical Research-Atmospheres, 126 (6). ISSN 2169-897X, DOI https://doi.org/10.1029/2020JD033554 <https://doi.org/10.1029/2020JD033554>. 10.1029/2020JD033554
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QB Astronomy
QC Physics
QD Chemistry
spellingShingle QB Astronomy
QC Physics
QD Chemistry
Banerjee, Tirthankar
Shitole, A. S.
Mhawish, Alaa
Anand, A.
Ranjan, R.
Khan, Md Firoz
Srithawirat, T.
Latif, Mohd T.
Mall, R. K.
Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields
description Aerosol climatology during typical haze dominating period over South and Southeast Asia was explored using several Earth-Observing A-Train satellite products retrieved in between 2010 and 2020. Comparatively high aerosol optical depth (AOD) with dominance of fine and UV-absorbing aerosols are noted across the Indo-Gangetic plain, South Asia (IGP; AOD: 0.58; UVAI: 0.74) against weak UV-absorbing fine aerosols over Southeast Asia (SEA; AOD: 0.26; UVAI: 0.07). Among inland IGP sites, decadal mean AOD resembles in Lahore (0.72 +/- 0.45), Delhi (0.81 +/- 0.46), Kanpur (0.84 +/- 0.42), and Varanasi (0.78 +/- 0.45); all exhibiting bimodal AOD distribution with a first peak in early November followed by a second in early January. In contrast, except mainland site Chiang Mai, all SEA maritime cities resemble in having typical September-October AOD peak, with the presence of fine and UV-neutral aerosols. Urban hotspots across IGP and SEA (except Dhaka, Chiang Mai) denote a spatially consistent minor increasing trend in AOD (0.2-1.8 x 10(-2) year(-1)) while increase in UVAI is more prominent over upper IGP. Dust aerosols dominate only in Karachi (46%) against strong UV-absorbing smoke aerosols over rest of the IGP (71-91%), and UV-neutral smoke aerosols across SEA (84-92%). Vertical stratification of aerosol types is noted across IGP as in lower atmosphere (<4 km) polluted dust/urban aerosols remain abundant, with gradual decrease in dust aerosols from upper to lower IGP and consequent increase in smoke aerosols. At upper atmosphere (>4 km), however, dust aerosols clearly dominate. Over SEA, smoke are the most abundant aerosols across the atmospheric column followed by polluted dust. No evidence of intracontinental transport of aerosols from IGP to Southeast Asia or vice versa is, however, noted.
format Article
author Banerjee, Tirthankar
Shitole, A. S.
Mhawish, Alaa
Anand, A.
Ranjan, R.
Khan, Md Firoz
Srithawirat, T.
Latif, Mohd T.
Mall, R. K.
author_facet Banerjee, Tirthankar
Shitole, A. S.
Mhawish, Alaa
Anand, A.
Ranjan, R.
Khan, Md Firoz
Srithawirat, T.
Latif, Mohd T.
Mall, R. K.
author_sort Banerjee, Tirthankar
title Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields
title_short Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields
title_full Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields
title_fullStr Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields
title_full_unstemmed Aerosol climatology over South and Southeast Asia: Aerosol types, vertical profile, and source fields
title_sort aerosol climatology over south and southeast asia: aerosol types, vertical profile, and source fields
publisher Amer Geophysical Union
publishDate 2021
url http://eprints.um.edu.my/34152/
_version_ 1738510712384258048
score 13.211869

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