MAX-DOAS retrieval of aerosol extinction properties in Madrid, Spain
Multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements were performed in the urban environment of Madrid, Spain, from March to September 2015. The O 4 absorption in the ultraviolet (UV) spectral region was used to retrieve the aerosol extinction profile using an inversion al...
| Published in: | Atmospheric Measurement Techniques |
|---|---|
| Main Authors: | , , , |
| Format: | Text |
| Language: | English |
| Published: |
2018
|
| Subjects: | |
| Online Access: | https://doi.org/10.5194/amt-9-5089-2016 https://amt.copernicus.org/articles/9/5089/2016/ |
| Summary: | Multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements were performed in the urban environment of Madrid, Spain, from March to September 2015. The O 4 absorption in the ultraviolet (UV) spectral region was used to retrieve the aerosol extinction profile using an inversion algorithm. The results show a good agreement between the hourly retrieved aerosol optical depth (AOD) and the correlative Aerosol Robotic Network (AERONET) product, with a correlation coefficient of R = 0.87. Higher AODs are found in the summer season due to the more frequent occurrence of Saharan dust intrusions. The surface aerosol extinction coefficient as retrieved by the MAX-DOAS measurements was also compared to in situ PM 2.5 concentrations. The level of agreement between both measurements indicates that the MAX-DOAS retrieval has the ability to characterize the extinction of aerosol particles near the surface. The retrieval algorithm was also used to study a case of severe dust intrusion on 12 May 2015. The capability of the MAX-DOAS retrieval to recognize the dust event including an elevated particle layer is investigated along with air mass back-trajectory analysis. |
|---|