Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe
Long-term Aqua and Terra MODIS (MODerate resolution Imaging Spectroradiometer) Collections 5.1 and 6.1 (c051 and c061, respectively) aerosol data have been combined with AERONET (AERosol RObotic NETwork) ground-based sun photometer observations to examine trends in aerosol optical thickness (AOT, at...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Stockholm University Press
2019-01-01
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| Series: | Tellus: Series B, Chemical and Physical Meteorology |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/16000889.2018.1554414 |
| _version_ | 1811300795578056704 |
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| author | Paul Glantz Eyal Freud Christer Johansson Kevin J. Noone Matthias Tesche |
| author_facet | Paul Glantz Eyal Freud Christer Johansson Kevin J. Noone Matthias Tesche |
| author_sort | Paul Glantz |
| collection | DOAJ |
| description | Long-term Aqua and Terra MODIS (MODerate resolution Imaging Spectroradiometer) Collections 5.1 and 6.1 (c051 and c061, respectively) aerosol data have been combined with AERONET (AERosol RObotic NETwork) ground-based sun photometer observations to examine trends in aerosol optical thickness (AOT, at 550 nm) over Northern Europe for the months April to September. For the 1927 and 1559 daily coincident measurements that were obtained for c051 and c061, respectively, MODIS AOT varied by 86 and 90%, respectively, within the predicted uncertainty of one standard deviation of the retrieval over land (ΔAOT = ±0.05 ± 0.15·AOT). For the coastal AERONET site Gustav Dalen Tower (GDT), Sweden, larger deviations were found for MODIS c051 and c061 (79% and 75%, respectively, within predicted uncertainty). The Baltic Sea provides substantially better statistical representation of AOT than the surrounding land areas and therefore favours the investigations of trends in AOT over the region. Negative trends of 1.5% and 1.2% per year in AOT, based on daily averaging, were found for the southwestern Baltic Sea from MODIS c051 and c061, respectively. This is in line with a decrease of 1.2% per year in AOT at the AERONET station Hamburg. For the western Gotland Basin area, Sweden, negative trends of 1.5%, 1.1% and 1.6% per year in AOT have been found for MODIS c051, MODIS c061 and AERONET GDT, respectively. The strongest trend of –1.8% per year in AOT was found for AERONET Belsk, Poland, which can be compared to –1.5% per day obtained from MODIS c051 over central Poland. The trends in MODIS and AERONET AOT are nearly all statistically significant at the 95% confidence level. The strongest aerosol sources are suggested to be located southwest, south and southeast of the investigation area, although the highest prevalence of pollution events is associated with air mass transport from southwest. |
| first_indexed | 2024-04-13T06:57:33Z |
| format | Article |
| id | doaj.art-2618c4cecda84625b62731cc48ff4f92 |
| institution | Directory Open Access Journal |
| issn | 1600-0889 |
| language | English |
| last_indexed | 2024-04-13T06:57:33Z |
| publishDate | 2019-01-01 |
| publisher | Stockholm University Press |
| record_format | Article |
| series | Tellus: Series B, Chemical and Physical Meteorology |
| spelling | doaj.art-2618c4cecda84625b62731cc48ff4f922022-12-22T02:57:12ZengStockholm University PressTellus: Series B, Chemical and Physical Meteorology1600-08892019-01-0171110.1080/16000889.2018.15544141554414Trends in MODIS and AERONET derived aerosol optical thickness over Northern EuropePaul Glantz0Eyal Freud1Christer Johansson2Kevin J. Noone3Matthias Tesche4Stockholm UniversityStockholm UniversityStockholm UniversityStockholm UniversityUniversity of HertfordshireLong-term Aqua and Terra MODIS (MODerate resolution Imaging Spectroradiometer) Collections 5.1 and 6.1 (c051 and c061, respectively) aerosol data have been combined with AERONET (AERosol RObotic NETwork) ground-based sun photometer observations to examine trends in aerosol optical thickness (AOT, at 550 nm) over Northern Europe for the months April to September. For the 1927 and 1559 daily coincident measurements that were obtained for c051 and c061, respectively, MODIS AOT varied by 86 and 90%, respectively, within the predicted uncertainty of one standard deviation of the retrieval over land (ΔAOT = ±0.05 ± 0.15·AOT). For the coastal AERONET site Gustav Dalen Tower (GDT), Sweden, larger deviations were found for MODIS c051 and c061 (79% and 75%, respectively, within predicted uncertainty). The Baltic Sea provides substantially better statistical representation of AOT than the surrounding land areas and therefore favours the investigations of trends in AOT over the region. Negative trends of 1.5% and 1.2% per year in AOT, based on daily averaging, were found for the southwestern Baltic Sea from MODIS c051 and c061, respectively. This is in line with a decrease of 1.2% per year in AOT at the AERONET station Hamburg. For the western Gotland Basin area, Sweden, negative trends of 1.5%, 1.1% and 1.6% per year in AOT have been found for MODIS c051, MODIS c061 and AERONET GDT, respectively. The strongest trend of –1.8% per year in AOT was found for AERONET Belsk, Poland, which can be compared to –1.5% per day obtained from MODIS c051 over central Poland. The trends in MODIS and AERONET AOT are nearly all statistically significant at the 95% confidence level. The strongest aerosol sources are suggested to be located southwest, south and southeast of the investigation area, although the highest prevalence of pollution events is associated with air mass transport from southwest.http://dx.doi.org/10.1080/16000889.2018.1554414aerosol optical thicknessanthropogenic aerosolsatellite observationsatmospheric transport |
| spellingShingle | Paul Glantz Eyal Freud Christer Johansson Kevin J. Noone Matthias Tesche Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe Tellus: Series B, Chemical and Physical Meteorology aerosol optical thickness anthropogenic aerosol satellite observations atmospheric transport |
| title | Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe |
| title_full | Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe |
| title_fullStr | Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe |
| title_full_unstemmed | Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe |
| title_short | Trends in MODIS and AERONET derived aerosol optical thickness over Northern Europe |
| title_sort | trends in modis and aeronet derived aerosol optical thickness over northern europe |
| topic | aerosol optical thickness anthropogenic aerosol satellite observations atmospheric transport |
| url | http://dx.doi.org/10.1080/16000889.2018.1554414 |
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