Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect
International audience Statistical analyses of data from ground-based sun photometer stations in Central Europe are presented. All stations are part of the Aerosol Robotic Network (AERONET), and only data of the highest data quality level 2.0 has been applied. The averages by weekday of Aerosol Opti...
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ftccsdartic:oai:HAL:hal-00296408v1 2023-11-12T03:59:49+01:00 Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect Bäumer, D. Rinke, R. Vogel, B. Institute for Meteorology and Climate Research (IMK) Karlsruhe Institute of Technology (KIT) 2008-01-14 https://hal.science/hal-00296408 https://hal.science/hal-00296408/document https://hal.science/hal-00296408/file/acp-8-83-2008.pdf en eng HAL CCSD European Geosciences Union hal-00296408 https://hal.science/hal-00296408 https://hal.science/hal-00296408/document https://hal.science/hal-00296408/file/acp-8-83-2008.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00296408 Atmospheric Chemistry and Physics, 2008, 8 (1), pp.83-90 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2008 ftccsdartic 2023-10-21T23:16:49Z International audience Statistical analyses of data from ground-based sun photometer stations in Central Europe are presented. All stations are part of the Aerosol Robotic Network (AERONET), and only data of the highest data quality level 2.0 has been applied. The averages by weekday of Aerosol Optical Thickness (AOT) at a wavelength of 440 nm of 12 of the 14 stations in the investigation area show a weekly periodicity with lowest values on Sunday and Monday, but greatest values from Wednesday until Saturday, that is significant at least on a 90% level. The stations in Germany and in Greater Paris show weekly cycles with ranges of about 20% on average. In Northern Italy and Switzerland this range is about 10% on average. By applying several checks, we exclude that the weekly cycles were caused by a maintenance effect or by different retrieval conditions as a consequence of a weekly cycle in cloud cover. The corresponding weekly cycle of anthropogenic gaseous and particulate emissions leads us to the conclusion of the anthropogenic origin of the weekly AOT cycle. Since these AOT patterns are derived from the reduction of the direct sun radiation by the columnar atmospheric aerosol, this result represents strong evidence for an anthropogenic direct aerosol effect on shortwave radiation. Furthermore, this study makes a first contribution to the understanding and explanation of recently observed weekly periodicities in meteorological variables as temperature in Germany. Article in Journal/Newspaper Aerosol Robotic Network Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Bäumer, D. Rinke, R. Vogel, B. Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Statistical analyses of data from ground-based sun photometer stations in Central Europe are presented. All stations are part of the Aerosol Robotic Network (AERONET), and only data of the highest data quality level 2.0 has been applied. The averages by weekday of Aerosol Optical Thickness (AOT) at a wavelength of 440 nm of 12 of the 14 stations in the investigation area show a weekly periodicity with lowest values on Sunday and Monday, but greatest values from Wednesday until Saturday, that is significant at least on a 90% level. The stations in Germany and in Greater Paris show weekly cycles with ranges of about 20% on average. In Northern Italy and Switzerland this range is about 10% on average. By applying several checks, we exclude that the weekly cycles were caused by a maintenance effect or by different retrieval conditions as a consequence of a weekly cycle in cloud cover. The corresponding weekly cycle of anthropogenic gaseous and particulate emissions leads us to the conclusion of the anthropogenic origin of the weekly AOT cycle. Since these AOT patterns are derived from the reduction of the direct sun radiation by the columnar atmospheric aerosol, this result represents strong evidence for an anthropogenic direct aerosol effect on shortwave radiation. Furthermore, this study makes a first contribution to the understanding and explanation of recently observed weekly periodicities in meteorological variables as temperature in Germany. |
author2 |
Institute for Meteorology and Climate Research (IMK) Karlsruhe Institute of Technology (KIT) |
format |
Article in Journal/Newspaper |
author |
Bäumer, D. Rinke, R. Vogel, B. |
author_facet |
Bäumer, D. Rinke, R. Vogel, B. |
author_sort |
Bäumer, D. |
title |
Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect |
title_short |
Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect |
title_full |
Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect |
title_fullStr |
Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect |
title_full_unstemmed |
Weekly periodicities of Aerosol Optical Thickness over Central Europe ? evidence of an anthropogenic direct aerosol effect |
title_sort |
weekly periodicities of aerosol optical thickness over central europe ? evidence of an anthropogenic direct aerosol effect |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00296408 https://hal.science/hal-00296408/document https://hal.science/hal-00296408/file/acp-8-83-2008.pdf |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00296408 Atmospheric Chemistry and Physics, 2008, 8 (1), pp.83-90 |
op_relation |
hal-00296408 https://hal.science/hal-00296408 https://hal.science/hal-00296408/document https://hal.science/hal-00296408/file/acp-8-83-2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336637990076416 |