Changing patterns in aerosol vertical distribution over South and East Asia

Abstract Changing patterns in aerosol concentrations over the Asian region is well documented with a concurrent increase over India and a marked reduction over China. However, aerosol vertical distribution in the changing climate is not fully understood. By combining long-term satellite observations...

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Autores principales:	M. Venkat Ratnam, P. Prasad, S. T. Akhil Raj, M. Roja Raman, Ghouse Basha
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0bf2cd0425914ac9a2d2ebb67fafd07f
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spelling	oai:doaj.org-article:0bf2cd0425914ac9a2d2ebb67fafd07f2021-12-02T14:01:20ZChanging patterns in aerosol vertical distribution over South and East Asia10.1038/s41598-020-79361-42045-2322https://doaj.org/article/0bf2cd0425914ac9a2d2ebb67fafd07f2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79361-4https://doaj.org/toc/2045-2322Abstract Changing patterns in aerosol concentrations over the Asian region is well documented with a concurrent increase over India and a marked reduction over China. However, aerosol vertical distribution in the changing climate is not fully understood. By combining long-term satellite observations from MODIS and CALIOP, here we show rapid changes in the aerosol vertical distribution over the South and East Asia covering India and China. A statistically significant decreasing (increasing) trend in the boundary layer (free troposphere) aerosol concentrations is noticed over India. ERA-Interim reanalysis model suggests that this increase in free tropospheric aerosol concentrations are due to the lifting of boundary layer pollutants through an increase in convection (and vertical velocity) in a changing climate. In contrast, a consistent decreasing trend is observed over China irrespective of the altitude. Interestingly, a decreasing trend in Aerosol Optical Depth is observed over the northwest India and we relate this to an observed increase in precipitation leading to increase in the vegetation. It is also found that long-term oscillations like QBO, ENSO and solar cycle significantly affect the aerosol concentrations. Thus, it is prudent to conclude that background meteorology and dynamics play an important role in changing patterns of aerosol vertical distribution.M. Venkat RatnamP. PrasadS. T. Akhil RajM. Roja RamanGhouse BashaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Venkat Ratnam P. Prasad S. T. Akhil Raj M. Roja Raman Ghouse Basha Changing patterns in aerosol vertical distribution over South and East Asia
description	Abstract Changing patterns in aerosol concentrations over the Asian region is well documented with a concurrent increase over India and a marked reduction over China. However, aerosol vertical distribution in the changing climate is not fully understood. By combining long-term satellite observations from MODIS and CALIOP, here we show rapid changes in the aerosol vertical distribution over the South and East Asia covering India and China. A statistically significant decreasing (increasing) trend in the boundary layer (free troposphere) aerosol concentrations is noticed over India. ERA-Interim reanalysis model suggests that this increase in free tropospheric aerosol concentrations are due to the lifting of boundary layer pollutants through an increase in convection (and vertical velocity) in a changing climate. In contrast, a consistent decreasing trend is observed over China irrespective of the altitude. Interestingly, a decreasing trend in Aerosol Optical Depth is observed over the northwest India and we relate this to an observed increase in precipitation leading to increase in the vegetation. It is also found that long-term oscillations like QBO, ENSO and solar cycle significantly affect the aerosol concentrations. Thus, it is prudent to conclude that background meteorology and dynamics play an important role in changing patterns of aerosol vertical distribution.
format	article
author	M. Venkat Ratnam P. Prasad S. T. Akhil Raj M. Roja Raman Ghouse Basha
author_facet	M. Venkat Ratnam P. Prasad S. T. Akhil Raj M. Roja Raman Ghouse Basha
author_sort	M. Venkat Ratnam
title	Changing patterns in aerosol vertical distribution over South and East Asia
title_short	Changing patterns in aerosol vertical distribution over South and East Asia
title_full	Changing patterns in aerosol vertical distribution over South and East Asia
title_fullStr	Changing patterns in aerosol vertical distribution over South and East Asia
title_full_unstemmed	Changing patterns in aerosol vertical distribution over South and East Asia
title_sort	changing patterns in aerosol vertical distribution over south and east asia
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0bf2cd0425914ac9a2d2ebb67fafd07f
work_keys_str_mv	AT mvenkatratnam changingpatternsinaerosolverticaldistributionoversouthandeastasia AT pprasad changingpatternsinaerosolverticaldistributionoversouthandeastasia AT stakhilraj changingpatternsinaerosolverticaldistributionoversouthandeastasia AT mrojaraman changingpatternsinaerosolverticaldistributionoversouthandeastasia AT ghousebasha changingpatternsinaerosolverticaldistributionoversouthandeastasia
_version_	1718392181624930304

Changing patterns in aerosol vertical distribution over South and East Asia

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