Aerosol climatology: on the discrimination of aerosol types over four AERONET sites
International audience Aerosols have a significant regional and global effect on climate, which is about equal in magnitude but opposite in sign to that of greenhouse gases. Nevertheless, the aerosol climatic effect changes strongly with space and time because of the large variability of aerosol phy...
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ftinsu:oai:HAL:hal-00302763v1 2023-11-12T03:59:50+01:00 Aerosol climatology: on the discrimination of aerosol types over four AERONET sites Kaskaoutis, D. G. Kambezidis, H. D. Hatzianastassiou, N. Kosmopoulos, P. G. Badarinath, K. V. S. Atmospheric Research Team Athens Institute for Environmental Research and Sustainable Development (IERSD) National Observatory of Athens (NOA)-National Observatory of Athens (NOA) Laboratory of Meteorology Ioannina University of Ioannina Forestry & Ecology Division National Remote Sensing Centre Hyderabad (NRSC) Indian Space Research Organisation (ISRO)-Indian Space Research Organisation (ISRO) 2007-05-11 https://hal.science/hal-00302763 https://hal.science/hal-00302763/document https://hal.science/hal-00302763/file/acpd-7-6357-2007.pdf en eng HAL CCSD European Geosciences Union hal-00302763 https://hal.science/hal-00302763 https://hal.science/hal-00302763/document https://hal.science/hal-00302763/file/acpd-7-6357-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00302763 Atmospheric Chemistry and Physics Discussions, 2007, 7 (3), pp.6357-6411 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftinsu 2023-10-25T16:26:31Z International audience Aerosols have a significant regional and global effect on climate, which is about equal in magnitude but opposite in sign to that of greenhouse gases. Nevertheless, the aerosol climatic effect changes strongly with space and time because of the large variability of aerosol physical and optical properties, which is due to the variety of their sources, which are natural, and anthropogenic, and their dependence on the prevailing meteorological and atmospheric conditions. Characterization of aerosol properties is of major importance for the assessment of their role for climate. In the present study, 3-year AErosol RObotic NETwork (AERONET) data from ground-based sunphotometer measurements are used to establish climatologies of aerosol optical depth (AOD) and Ångström exponent ? in several key locations of the world, characteristic of different atmospheric environments. Using daily mean values of AOD at 500 nm (AOD 500 ) and Ångström exponent at the pair of wavelengths 440 and 870 nm (? 440?870 ), a discrimination of the different aerosol types occurring in each location is achieved. For this discrimination, appropriate thresholds for AOD 500 and ? 440?870 are applied. The discrimination of aerosol types in each location is made on an annual and seasonal basis. It is shown that a single aerosol type in a given location can exist only under specific conditions (e.g. intense forest fires or dust outbreaks), while the presence of well-mixed aerosols is the accustomed situation. Background clean aerosol conditions (AOD 500 <0.06) are mostly found over remote oceanic surfaces occurring on average in ~56.7% of total cases, while this situation is quite rare over land (occurrence of 3.8?13.7%). Our analysis indicates that these percentages change significantly from season to season. The spectral dependence of AOD exhibits large differences between the examined locations, while it exhibits a strong annual cycle. Article in Journal/Newspaper Aerosol Robotic Network Institut national des sciences de l'Univers: HAL-INSU |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Kaskaoutis, D. G. Kambezidis, H. D. Hatzianastassiou, N. Kosmopoulos, P. G. Badarinath, K. V. S. Aerosol climatology: on the discrimination of aerosol types over four AERONET sites |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Aerosols have a significant regional and global effect on climate, which is about equal in magnitude but opposite in sign to that of greenhouse gases. Nevertheless, the aerosol climatic effect changes strongly with space and time because of the large variability of aerosol physical and optical properties, which is due to the variety of their sources, which are natural, and anthropogenic, and their dependence on the prevailing meteorological and atmospheric conditions. Characterization of aerosol properties is of major importance for the assessment of their role for climate. In the present study, 3-year AErosol RObotic NETwork (AERONET) data from ground-based sunphotometer measurements are used to establish climatologies of aerosol optical depth (AOD) and Ångström exponent ? in several key locations of the world, characteristic of different atmospheric environments. Using daily mean values of AOD at 500 nm (AOD 500 ) and Ångström exponent at the pair of wavelengths 440 and 870 nm (? 440?870 ), a discrimination of the different aerosol types occurring in each location is achieved. For this discrimination, appropriate thresholds for AOD 500 and ? 440?870 are applied. The discrimination of aerosol types in each location is made on an annual and seasonal basis. It is shown that a single aerosol type in a given location can exist only under specific conditions (e.g. intense forest fires or dust outbreaks), while the presence of well-mixed aerosols is the accustomed situation. Background clean aerosol conditions (AOD 500 <0.06) are mostly found over remote oceanic surfaces occurring on average in ~56.7% of total cases, while this situation is quite rare over land (occurrence of 3.8?13.7%). Our analysis indicates that these percentages change significantly from season to season. The spectral dependence of AOD exhibits large differences between the examined locations, while it exhibits a strong annual cycle. |
author2 |
Atmospheric Research Team Athens Institute for Environmental Research and Sustainable Development (IERSD) National Observatory of Athens (NOA)-National Observatory of Athens (NOA) Laboratory of Meteorology Ioannina University of Ioannina Forestry & Ecology Division National Remote Sensing Centre Hyderabad (NRSC) Indian Space Research Organisation (ISRO)-Indian Space Research Organisation (ISRO) |
format |
Article in Journal/Newspaper |
author |
Kaskaoutis, D. G. Kambezidis, H. D. Hatzianastassiou, N. Kosmopoulos, P. G. Badarinath, K. V. S. |
author_facet |
Kaskaoutis, D. G. Kambezidis, H. D. Hatzianastassiou, N. Kosmopoulos, P. G. Badarinath, K. V. S. |
author_sort |
Kaskaoutis, D. G. |
title |
Aerosol climatology: on the discrimination of aerosol types over four AERONET sites |
title_short |
Aerosol climatology: on the discrimination of aerosol types over four AERONET sites |
title_full |
Aerosol climatology: on the discrimination of aerosol types over four AERONET sites |
title_fullStr |
Aerosol climatology: on the discrimination of aerosol types over four AERONET sites |
title_full_unstemmed |
Aerosol climatology: on the discrimination of aerosol types over four AERONET sites |
title_sort |
aerosol climatology: on the discrimination of aerosol types over four aeronet sites |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00302763 https://hal.science/hal-00302763/document https://hal.science/hal-00302763/file/acpd-7-6357-2007.pdf |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00302763 Atmospheric Chemistry and Physics Discussions, 2007, 7 (3), pp.6357-6411 |
op_relation |
hal-00302763 https://hal.science/hal-00302763 https://hal.science/hal-00302763/document https://hal.science/hal-00302763/file/acpd-7-6357-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782337633750351872 |