Increase in upper tropospheric and lower stratospheric aerosol levels and its potential connection with Asian pollution
(2015) In Journal of Geophysical Research: Atmospheres 120(4). p.1608-1619- Abstract
- Satellite observations have shown that the Asian Summer Monsoon strongly influences the upper troposphere and lower stratosphere (UTLS) aerosol morphology through its role in the formation of the Asian Tropopause Aerosol Layer (ATAL). Stratospheric Aerosol and Gas Experiment II solar occultation and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar observations show that summertime UTLS Aerosol Optical Depth (AOD) between 13 and 18 km over Asia has increased by three times since the late 1990s. Here we present the first in situ balloon measurements of aerosol backscatter in the UTLS from Western China, which confirm high aerosol levels observed by CALIPSO since 2006. Aircraft in situ measurements suggest... (More)
- Satellite observations have shown that the Asian Summer Monsoon strongly influences the upper troposphere and lower stratosphere (UTLS) aerosol morphology through its role in the formation of the Asian Tropopause Aerosol Layer (ATAL). Stratospheric Aerosol and Gas Experiment II solar occultation and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar observations show that summertime UTLS Aerosol Optical Depth (AOD) between 13 and 18 km over Asia has increased by three times since the late 1990s. Here we present the first in situ balloon measurements of aerosol backscatter in the UTLS from Western China, which confirm high aerosol levels observed by CALIPSO since 2006. Aircraft in situ measurements suggest that aerosols at lower altitudes of the ATAL are largely composed of carbonaceous and sulfate materials (carbon/sulfur elemental ratio ranging from 2 to 10). Back trajectory analysis from Cloud-Aerosol Lidar with Orthogonal Polarization observations indicates that deep convection over the Indian subcontinent supplies the ATAL through the transport of pollution into the UTLS. Time series of deep convection occurrence, carbon monoxide, aerosol, temperature, and relative humidity suggest that secondary aerosol formation and growth in a cold, moist convective environment could play an important role in the formation of ATAL. Finally, radiative calculations show that the ATAL layer has exerted a short-term regional forcing at the top of the atmosphere of -0.1 W/m(2) in the past 18 years. (Less)
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https://lup.lub.lu.se/record/5293802
- author
- Vernier, J. -P. ; Fairlie, T. D. ; Natarajan, M. ; Wienhold, F. G. ; Bian, J. ; Martinsson, Bengt LU ; Crumeyrolle, S. ; Thomason, L. W. and Bedka, K. M.
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Geophysical Research: Atmospheres
- volume
- 120
- issue
- 4
- pages
- 1608 - 1619
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:26691186
- wos:000351182400023
- scopus:84925096685
- pmid:26691186
- ISSN
- 2169-8996
- DOI
- 10.1002/2014JD022372
- language
- English
- LU publication?
- yes
- id
- f24d18ca-5dc6-42bd-a0c8-28f8350c57d3 (old id 5293802)
- date added to LUP
- 2016-04-01 10:09:36
- date last changed
- 2022-04-19 23:13:04
@article{f24d18ca-5dc6-42bd-a0c8-28f8350c57d3,
abstract = {{Satellite observations have shown that the Asian Summer Monsoon strongly influences the upper troposphere and lower stratosphere (UTLS) aerosol morphology through its role in the formation of the Asian Tropopause Aerosol Layer (ATAL). Stratospheric Aerosol and Gas Experiment II solar occultation and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar observations show that summertime UTLS Aerosol Optical Depth (AOD) between 13 and 18 km over Asia has increased by three times since the late 1990s. Here we present the first in situ balloon measurements of aerosol backscatter in the UTLS from Western China, which confirm high aerosol levels observed by CALIPSO since 2006. Aircraft in situ measurements suggest that aerosols at lower altitudes of the ATAL are largely composed of carbonaceous and sulfate materials (carbon/sulfur elemental ratio ranging from 2 to 10). Back trajectory analysis from Cloud-Aerosol Lidar with Orthogonal Polarization observations indicates that deep convection over the Indian subcontinent supplies the ATAL through the transport of pollution into the UTLS. Time series of deep convection occurrence, carbon monoxide, aerosol, temperature, and relative humidity suggest that secondary aerosol formation and growth in a cold, moist convective environment could play an important role in the formation of ATAL. Finally, radiative calculations show that the ATAL layer has exerted a short-term regional forcing at the top of the atmosphere of -0.1 W/m(2) in the past 18 years.}},
author = {{Vernier, J. -P. and Fairlie, T. D. and Natarajan, M. and Wienhold, F. G. and Bian, J. and Martinsson, Bengt and Crumeyrolle, S. and Thomason, L. W. and Bedka, K. M.}},
issn = {{2169-8996}},
language = {{eng}},
number = {{4}},
pages = {{1608--1619}},
publisher = {{Wiley-Blackwell}},
series = {{Journal of Geophysical Research: Atmospheres}},
title = {{Increase in upper tropospheric and lower stratospheric aerosol levels and its potential connection with Asian pollution}},
url = {{http://dx.doi.org/10.1002/2014JD022372}},
doi = {{10.1002/2014JD022372}},
volume = {{120}},
year = {{2015}},
}