Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece
<p>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-DOA...
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-01-01
|
| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/14/749/2021/amt-14-749-2021.pdf |
| _version_ | 1818936535304634368 |
|---|---|
| author | M. Gratsea M. Gratsea T. Bösch P. Kokkalis P. Kokkalis A. Richter M. Vrekoussis M. Vrekoussis S. Kazadzis S. Kazadzis A. Tsekeri A. Papayannis M. Mylonaki V. Amiridis N. Mihalopoulos N. Mihalopoulos N. Mihalopoulos E. Gerasopoulos |
| author_facet | M. Gratsea M. Gratsea T. Bösch P. Kokkalis P. Kokkalis A. Richter M. Vrekoussis M. Vrekoussis S. Kazadzis S. Kazadzis A. Tsekeri A. Papayannis M. Mylonaki V. Amiridis N. Mihalopoulos N. Mihalopoulos N. Mihalopoulos E. Gerasopoulos |
| author_sort | M. Gratsea |
| collection | DOAJ |
| description | <p>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 <span class="inline-formula">nm</span> are derived from the oxygen dimer (<span class="inline-formula">O<sub>4</sub></span>)
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 <span class="inline-formula">nm</span> reveals a very good
agreement in terms of vertical distribution, with <span class="inline-formula"><i>r</i>>0.90</span> in all cases. The AODs from the MAX-DOAS and the sun photometer (the latter at
500 <span class="inline-formula">nm</span>) show a satisfactory correlation (with 0.45 <span class="inline-formula"><</span> <span class="inline-formula"><i>r</i></span> <span class="inline-formula"><</span> 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.</p> |
| first_indexed | 2024-12-20T05:37:36Z |
| format | Article |
| id | doaj.art-8f341d3765ff47b280a99f45a9d608a0 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-20T05:37:36Z |
| publishDate | 2021-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-8f341d3765ff47b280a99f45a9d608a02022-12-21T19:51:33ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482021-01-011474976710.5194/amt-14-749-2021Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, GreeceM. Gratsea0M. Gratsea1T. Bösch2P. Kokkalis3P. Kokkalis4A. Richter5M. Vrekoussis6M. Vrekoussis7S. Kazadzis8S. Kazadzis9A. Tsekeri10A. Papayannis11M. Mylonaki12V. Amiridis13N. Mihalopoulos14N. Mihalopoulos15N. Mihalopoulos16E. Gerasopoulos17Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, GreeceEnvironmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Heraklion, GreeceInstitute of Environmental Physics and Remote Sensing, University of Bremen, Bremen, GermanyInstitute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, GreecePhysics Department, Kuwait University, Kuwait, KuwaitInstitute of Environmental Physics and Remote Sensing, University of Bremen, Bremen, GermanyLaboratory for Modelling and Observation of the Earth System (LAMOS), University of Bremen, Bremen, GermanyClimate and Atmosphere Research Center, CARE-C, The Cyprus Institute, Nicosia, CyprusInstitute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, GreecePhysikalisch-Meteorologisches Observatorium Davos, World Radiation Center, Davos Dorf, SwitzerlandInstitute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, GreeceLaser Remote Sensing Laboratory, National Technical University of Athens, Athens, GreeceLaser Remote Sensing Laboratory, National Technical University of Athens, Athens, GreeceInstitute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, GreeceInstitute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, GreeceEnvironmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Heraklion, GreeceClimate and Atmosphere Research Center, CARE-C, The Cyprus Institute, Nicosia, CyprusInstitute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, Greece<p>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 <span class="inline-formula">nm</span> are derived from the oxygen dimer (<span class="inline-formula">O<sub>4</sub></span>) 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 <span class="inline-formula">nm</span> reveals a very good agreement in terms of vertical distribution, with <span class="inline-formula"><i>r</i>>0.90</span> in all cases. The AODs from the MAX-DOAS and the sun photometer (the latter at 500 <span class="inline-formula">nm</span>) show a satisfactory correlation (with 0.45 <span class="inline-formula"><</span> <span class="inline-formula"><i>r</i></span> <span class="inline-formula"><</span> 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.</p>https://amt.copernicus.org/articles/14/749/2021/amt-14-749-2021.pdf |
| spellingShingle | M. Gratsea M. Gratsea T. Bösch P. Kokkalis P. Kokkalis A. Richter M. Vrekoussis M. Vrekoussis S. Kazadzis S. Kazadzis A. Tsekeri A. Papayannis M. Mylonaki V. Amiridis N. Mihalopoulos N. Mihalopoulos N. Mihalopoulos E. Gerasopoulos Retrieval and evaluation of tropospheric-aerosol extinction profiles using multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements over Athens, Greece Atmospheric Measurement Techniques |
| title | 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_short | 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 |
| url | https://amt.copernicus.org/articles/14/749/2021/amt-14-749-2021.pdf |
| work_keys_str_mv | AT mgratsea retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT mgratsea retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT tbosch retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT pkokkalis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT pkokkalis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT arichter retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT mvrekoussis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT mvrekoussis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT skazadzis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT skazadzis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT atsekeri retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT apapayannis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT mmylonaki retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT vamiridis retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT nmihalopoulos retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT nmihalopoulos retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT nmihalopoulos retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece AT egerasopoulos retrievalandevaluationoftroposphericaerosolextinctionprofilesusingmultiaxisdifferentialopticalabsorptionspectroscopymaxdoasmeasurementsoverathensgreece |