Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece
In this study, we report on the retrieval of aerosol extinction profiles from ground-based scattered sunlight multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements, carried out at Athens, Greece. It is the first time that aerosol profiles are retrieved from MAX-DOAS measure...
Published in: | Atmospheric Measurement Techniques |
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ftcopernicus:oai:publications.copernicus.org:amt84644 2023-05-15T13:06:34+02:00 Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece Gratsea, Myrto Bösch, Tim Kokkalis, Panagiotis Richter, Andreas Vrekoussis, Mihalis Kazadzis, Stelios Tsekeri, Alexandra Papayannis, Alexandros Mylonaki, Maria Amiridis, Vassilis Mihalopoulos, Nikos Gerasopoulos, Evangelos 2021-01-29 application/pdf https://doi.org/10.5194/amt-14-749-2021 https://amt.copernicus.org/articles/14/749/2021/ eng eng doi:10.5194/amt-14-749-2021 https://amt.copernicus.org/articles/14/749/2021/ eISSN: 1867-8548 Text 2021 ftcopernicus https://doi.org/10.5194/amt-14-749-2021 2021-02-01T17:21:47Z In this study, we report on the retrieval of aerosol extinction profiles from ground-based scattered sunlight multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements, carried out at Athens, Greece. It is the first time that aerosol profiles are retrieved from MAX-DOAS measurements in Athens. The reported aerosol vertical distributions at 477 nm are derived from the oxygen dimer ( O 4 ) differential-slant-column-density observations at different elevation angles by applying the BRemen Optimal estimation REtrieval for Aerosol and trace gaseS (BOREAS) retrieval algorithm. Four case studies have been selected for validation purposes; the retrieved aerosol profiles and the corresponding aerosol optical depths (AODs) from the MAX-DOAS are compared with lidar extinction profiles and with sun-photometric measurements (Aerosol Robotic Network, AERONET, observations), respectively. Despite the different approach of each method regarding the retrieval of the aerosol information, the comparison with the lidar measurements at 532 nm reveals a very good agreement in terms of vertical distribution, with r >0.90 in all cases. The AODs from the MAX-DOAS and the sun photometer (the latter at 500 nm ) show a satisfactory correlation (with 0.45 < r < 0.7 in three out of the four cases). The comparison indicates that the MAX-DOAS systematically underestimates the AOD in the cases of large particles (small Ångström exponent) and for measurements at small relative azimuthal angles between the viewing direction and the sun. Better agreement is achieved in the morning, at large relative azimuthal angles. Overall, the aerosol profiles retrieved from MAX-DOAS measurements are of good quality; thus, new perspectives are opened up for assessing urban aerosol pollution on a long-term basis in Athens from continuous and uninterrupted MAX-DOAS measurements. Text Aerosol Robotic Network Copernicus Publications: E-Journals Boreas ENVELOPE(-3.933,-3.933,-71.300,-71.300) Atmospheric Measurement Techniques 14 1 749 767 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
In this study, we report on the retrieval of aerosol extinction profiles from ground-based scattered sunlight multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements, carried out at Athens, Greece. It is the first time that aerosol profiles are retrieved from MAX-DOAS measurements in Athens. The reported aerosol vertical distributions at 477 nm are derived from the oxygen dimer ( O 4 ) differential-slant-column-density observations at different elevation angles by applying the BRemen Optimal estimation REtrieval for Aerosol and trace gaseS (BOREAS) retrieval algorithm. Four case studies have been selected for validation purposes; the retrieved aerosol profiles and the corresponding aerosol optical depths (AODs) from the MAX-DOAS are compared with lidar extinction profiles and with sun-photometric measurements (Aerosol Robotic Network, AERONET, observations), respectively. Despite the different approach of each method regarding the retrieval of the aerosol information, the comparison with the lidar measurements at 532 nm reveals a very good agreement in terms of vertical distribution, with r >0.90 in all cases. The AODs from the MAX-DOAS and the sun photometer (the latter at 500 nm ) show a satisfactory correlation (with 0.45 < r < 0.7 in three out of the four cases). The comparison indicates that the MAX-DOAS systematically underestimates the AOD in the cases of large particles (small Ångström exponent) and for measurements at small relative azimuthal angles between the viewing direction and the sun. Better agreement is achieved in the morning, at large relative azimuthal angles. Overall, the aerosol profiles retrieved from MAX-DOAS measurements are of good quality; thus, new perspectives are opened up for assessing urban aerosol pollution on a long-term basis in Athens from continuous and uninterrupted MAX-DOAS measurements. |
format |
Text |
author |
Gratsea, Myrto Bösch, Tim Kokkalis, Panagiotis Richter, Andreas Vrekoussis, Mihalis Kazadzis, Stelios Tsekeri, Alexandra Papayannis, Alexandros Mylonaki, Maria Amiridis, Vassilis Mihalopoulos, Nikos Gerasopoulos, Evangelos |
spellingShingle |
Gratsea, Myrto Bösch, Tim Kokkalis, Panagiotis Richter, Andreas Vrekoussis, Mihalis Kazadzis, Stelios Tsekeri, Alexandra Papayannis, Alexandros Mylonaki, Maria Amiridis, Vassilis Mihalopoulos, Nikos Gerasopoulos, Evangelos Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece |
author_facet |
Gratsea, Myrto Bösch, Tim Kokkalis, Panagiotis Richter, Andreas Vrekoussis, Mihalis Kazadzis, Stelios Tsekeri, Alexandra Papayannis, Alexandros Mylonaki, Maria Amiridis, Vassilis Mihalopoulos, Nikos Gerasopoulos, Evangelos |
author_sort |
Gratsea, Myrto |
title |
Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece |
title_short |
Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece |
title_full |
Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece |
title_fullStr |
Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece |
title_full_unstemmed |
Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece |
title_sort |
retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (max-doas) measurements over athens, greece |
publishDate |
2021 |
url |
https://doi.org/10.5194/amt-14-749-2021 https://amt.copernicus.org/articles/14/749/2021/ |
long_lat |
ENVELOPE(-3.933,-3.933,-71.300,-71.300) |
geographic |
Boreas |
geographic_facet |
Boreas |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
eISSN: 1867-8548 |
op_relation |
doi:10.5194/amt-14-749-2021 https://amt.copernicus.org/articles/14/749/2021/ |
op_doi |
https://doi.org/10.5194/amt-14-749-2021 |
container_title |
Atmospheric Measurement Techniques |
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14 |
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1 |
container_start_page |
749 |
op_container_end_page |
767 |
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1766011351675699200 |