Aircraft measurements of aerosol optical depth in the Arctic during the AFLUX campaign 2019 ...
The presented spectral aerosol optical depth (AOD) data are measured with an active tracking Sun photometer SPTA. The system was installed under a quartz dome of Polar 5 to derive this mentioned AOD. It operates a filter wheel with ten selected wavelengths in the spectral range from 367 to 1024 nm....
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
2022
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| Online Access: | https://dx.doi.org/10.1594/pangaea.946923 https://doi.pangaea.de/10.1594/PANGAEA.946923 |
| Summary: | The presented spectral aerosol optical depth (AOD) data are measured with an active tracking Sun photometer SPTA. The system was installed under a quartz dome of Polar 5 to derive this mentioned AOD. It operates a filter wheel with ten selected wavelengths in the spectral range from 367 to 1024 nm. To measure the direct solar irradiance, the optics of the SPTA use an aperture with a field of view of 1°. With knowledge of the extraterrestrial signal, the spectral optical depth of the atmosphere as well as spectral optical depth of aerosol was derived. The extraterrestrial signal was calculated based on a Langley calibration, which are performed regularly in a high mountain area (Izana, Tenerife). The data were screened for contamination by clouds to minimize an artificial enhancement of the AOD. The cloud screening algorithm applied a threshold of measured irradiance and made use of the higher temporal and spatial variability of clouds compared to the rather smooth changes of aerosols properties. ... |
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