Long-term trends in aerosol optical characteristics in the Po Valley, Italy
Aerosol properties have been monitored by ground-based in situ and remote sensing measurements at the station for atmospheric research located in Ispra, on the edge of the Po Valley, for almost one decade. In situ measurements are performed according to Global Atmosphere Watch recommendations, and q...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2014
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-14-9129-2014 https://doaj.org/article/5be89acd557444eeb19414189c875fd7 |
id |
ftdoajarticles:oai:doaj.org/article:5be89acd557444eeb19414189c875fd7 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:5be89acd557444eeb19414189c875fd7 2023-05-15T13:06:29+02:00 Long-term trends in aerosol optical characteristics in the Po Valley, Italy J. P. Putaud F. Cavalli S. Martins dos Santos A. Dell'Acqua 2014-09-01T00:00:00Z https://doi.org/10.5194/acp-14-9129-2014 https://doaj.org/article/5be89acd557444eeb19414189c875fd7 EN eng Copernicus Publications http://www.atmos-chem-phys.net/14/9129/2014/acp-14-9129-2014.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-14-9129-2014 https://doaj.org/article/5be89acd557444eeb19414189c875fd7 Atmospheric Chemistry and Physics, Vol 14, Iss 17, Pp 9129-9136 (2014) Physics QC1-999 Chemistry QD1-999 article 2014 ftdoajarticles https://doi.org/10.5194/acp-14-9129-2014 2022-12-31T15:57:53Z Aerosol properties have been monitored by ground-based in situ and remote sensing measurements at the station for atmospheric research located in Ispra, on the edge of the Po Valley, for almost one decade. In situ measurements are performed according to Global Atmosphere Watch recommendations, and quality is assured through the participation in regular inter-laboratory comparisons. Sun-photometer data are produced by the Aerosol Robotic Network (AERONET). Data show significant decreasing trends over the 2004–2010 period for a number of variables, including particulate matter (PM) mass concentration, aerosol scattering, backscattering and absorption coefficients, and aerosol optical thickness (AOT). In situ measurement data show no significant trends in the aerosol backscatter ratio, but they do show a significant decreasing trend of about −0.7 ± 0.3% yr −1 in the aerosol single scattering albedo (SSA) in the visible light range. Similar trends are observed in the SSA retrieved from sun-photometer measurements. Correlations appear between in situ PM mass concentration and aerosol scattering coefficient, on the one hand, and elemental carbon (EC) concentration and aerosol absorption coefficient, on the other hand. However, no increase in the EC / PM ratio was observed, which could have explained the decrease in SSA. The application of a simple approximation to calculate the direct radiative forcing by aerosols suggests a significant diminution in their cooling effect, mainly due to the decrease in AOT. Applying the methodology we present to those sites, where the necessary suite of measurements is available, would provide important information to inform future policies for air-quality enhancement and fast climate change mitigation. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 14 17 9129 9136 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 J. P. Putaud F. Cavalli S. Martins dos Santos A. Dell'Acqua Long-term trends in aerosol optical characteristics in the Po Valley, Italy |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Aerosol properties have been monitored by ground-based in situ and remote sensing measurements at the station for atmospheric research located in Ispra, on the edge of the Po Valley, for almost one decade. In situ measurements are performed according to Global Atmosphere Watch recommendations, and quality is assured through the participation in regular inter-laboratory comparisons. Sun-photometer data are produced by the Aerosol Robotic Network (AERONET). Data show significant decreasing trends over the 2004–2010 period for a number of variables, including particulate matter (PM) mass concentration, aerosol scattering, backscattering and absorption coefficients, and aerosol optical thickness (AOT). In situ measurement data show no significant trends in the aerosol backscatter ratio, but they do show a significant decreasing trend of about −0.7 ± 0.3% yr −1 in the aerosol single scattering albedo (SSA) in the visible light range. Similar trends are observed in the SSA retrieved from sun-photometer measurements. Correlations appear between in situ PM mass concentration and aerosol scattering coefficient, on the one hand, and elemental carbon (EC) concentration and aerosol absorption coefficient, on the other hand. However, no increase in the EC / PM ratio was observed, which could have explained the decrease in SSA. The application of a simple approximation to calculate the direct radiative forcing by aerosols suggests a significant diminution in their cooling effect, mainly due to the decrease in AOT. Applying the methodology we present to those sites, where the necessary suite of measurements is available, would provide important information to inform future policies for air-quality enhancement and fast climate change mitigation. |
format |
Article in Journal/Newspaper |
author |
J. P. Putaud F. Cavalli S. Martins dos Santos A. Dell'Acqua |
author_facet |
J. P. Putaud F. Cavalli S. Martins dos Santos A. Dell'Acqua |
author_sort |
J. P. Putaud |
title |
Long-term trends in aerosol optical characteristics in the Po Valley, Italy |
title_short |
Long-term trends in aerosol optical characteristics in the Po Valley, Italy |
title_full |
Long-term trends in aerosol optical characteristics in the Po Valley, Italy |
title_fullStr |
Long-term trends in aerosol optical characteristics in the Po Valley, Italy |
title_full_unstemmed |
Long-term trends in aerosol optical characteristics in the Po Valley, Italy |
title_sort |
long-term trends in aerosol optical characteristics in the po valley, italy |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/acp-14-9129-2014 https://doaj.org/article/5be89acd557444eeb19414189c875fd7 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics, Vol 14, Iss 17, Pp 9129-9136 (2014) |
op_relation |
http://www.atmos-chem-phys.net/14/9129/2014/acp-14-9129-2014.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-14-9129-2014 https://doaj.org/article/5be89acd557444eeb19414189c875fd7 |
op_doi |
https://doi.org/10.5194/acp-14-9129-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
17 |
container_start_page |
9129 |
op_container_end_page |
9136 |
_version_ |
1766007800527323136 |