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Volcanic impact on the climate - The stratospheric aerosol load in the period 2006-2015

Friberg, Johan LU ; Martinsson, Bengt G. LU ; Andersson, Sandra M. LU and Sandvik, Oscar S. LU (2018) In Atmospheric Chemistry and Physics 18(15). p.11149-11169
Abstract

We present a study on the stratospheric aerosol load during 2006-2015, discuss the influence from volcanism and other sources, and reconstruct an aerosol optical depth (AOD) data set in a resolution of 1° latitudinally and 8 days timewise. The purpose is to include the "entire" stratosphere, from the tropopause to the almost particle-free altitudes of the midstratosphere. A dynamic tropopause of 1.5 PVU was used, since it enclosed almost all of the volcanic signals in the CALIOP data set. The data were successfully cleaned from polar stratospheric clouds using a temperature threshold of 195 K. Furthermore, a method was developed to correct data when the CALIOP laser beam was strongly attenuated by volcanic aerosol, preventing a negative... (More)

We present a study on the stratospheric aerosol load during 2006-2015, discuss the influence from volcanism and other sources, and reconstruct an aerosol optical depth (AOD) data set in a resolution of 1° latitudinally and 8 days timewise. The purpose is to include the "entire" stratosphere, from the tropopause to the almost particle-free altitudes of the midstratosphere. A dynamic tropopause of 1.5 PVU was used, since it enclosed almost all of the volcanic signals in the CALIOP data set. The data were successfully cleaned from polar stratospheric clouds using a temperature threshold of 195 K. Furthermore, a method was developed to correct data when the CALIOP laser beam was strongly attenuated by volcanic aerosol, preventing a negative bias in the AOD data set. Tropospheric influence, likely from upwelling dust, was found in the extratropical transition layer in spring. Eruptions of both extratropical and tropical volcanoes that injected aerosol into the stratosphere impacted the stratospheric aerosol load for up to a year if their clouds reached lower than 20 km altitude. Deeper-reaching tropical injections rose in the tropical pipe and impacted it for several years. Our AODs mostly compare well to other long-term studies of the stratospheric AOD. Over the years 2006-2015, volcanic eruptions increased the stratospheric AOD on average by ∼ 40 %. In absolute numbers the stratospheric AOD and radiative forcing amounted to 0.008 and -0.2 W m-2, respectively.

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publishing date
type
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publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
18
issue
15
pages
21 pages
publisher
Copernicus Gesellschaft mbH
external identifiers
  • scopus:85051415980
ISSN
1680-7316
DOI
10.5194/acp-18-11149-2018
language
English
LU publication?
yes
id
1fbd1314-879e-4ddb-8a5a-134e40f18627
date added to LUP
2018-09-10 11:02:20
date last changed
2020-10-07 06:00:54
@article{1fbd1314-879e-4ddb-8a5a-134e40f18627,
  abstract     = {<p>We present a study on the stratospheric aerosol load during 2006-2015, discuss the influence from volcanism and other sources, and reconstruct an aerosol optical depth (AOD) data set in a resolution of 1° latitudinally and 8 days timewise. The purpose is to include the "entire" stratosphere, from the tropopause to the almost particle-free altitudes of the midstratosphere. A dynamic tropopause of 1.5 PVU was used, since it enclosed almost all of the volcanic signals in the CALIOP data set. The data were successfully cleaned from polar stratospheric clouds using a temperature threshold of 195 K. Furthermore, a method was developed to correct data when the CALIOP laser beam was strongly attenuated by volcanic aerosol, preventing a negative bias in the AOD data set. Tropospheric influence, likely from upwelling dust, was found in the extratropical transition layer in spring. Eruptions of both extratropical and tropical volcanoes that injected aerosol into the stratosphere impacted the stratospheric aerosol load for up to a year if their clouds reached lower than 20 km altitude. Deeper-reaching tropical injections rose in the tropical pipe and impacted it for several years. Our AODs mostly compare well to other long-term studies of the stratospheric AOD. Over the years 2006-2015, volcanic eruptions increased the stratospheric AOD on average by ∼ 40 %. In absolute numbers the stratospheric AOD and radiative forcing amounted to 0.008 and -0.2 W m-2, respectively.</p>},
  author       = {Friberg, Johan and Martinsson, Bengt G. and Andersson, Sandra M. and Sandvik, Oscar S.},
  issn         = {1680-7316},
  language     = {eng},
  month        = {08},
  number       = {15},
  pages        = {11149--11169},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Volcanic impact on the climate - The stratospheric aerosol load in the period 2006-2015},
  url          = {http://dx.doi.org/10.5194/acp-18-11149-2018},
  doi          = {10.5194/acp-18-11149-2018},
  volume       = {18},
  year         = {2018},
}