On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product
Knowledge of the particle lidar ratio ( S λ ) and the particle linear depolarisation ratio ( δ λ ) for different aerosol types allows for aerosol typing and aerosol-type separation in lidar measurements. Reference values generally originate from dedicated lidar observations but might also be obtaine...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-18-12735-2018 https://doaj.org/article/9d4f4bf346b04d0aae8d958385fa1d53 |
id |
ftdoajarticles:oai:doaj.org/article:9d4f4bf346b04d0aae8d958385fa1d53 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:9d4f4bf346b04d0aae8d958385fa1d53 2023-05-15T13:06:46+02:00 On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product S.-K. Shin M. Tesche K. Kim M. Kezoudi B. Tatarov D. Müller Y. Noh 2018-09-01T00:00:00Z https://doi.org/10.5194/acp-18-12735-2018 https://doaj.org/article/9d4f4bf346b04d0aae8d958385fa1d53 EN eng Copernicus Publications https://www.atmos-chem-phys.net/18/12735/2018/acp-18-12735-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-12735-2018 1680-7316 1680-7324 https://doaj.org/article/9d4f4bf346b04d0aae8d958385fa1d53 Atmospheric Chemistry and Physics, Vol 18, Pp 12735-12746 (2018) Physics QC1-999 Chemistry QD1-999 article 2018 ftdoajarticles https://doi.org/10.5194/acp-18-12735-2018 2022-12-31T13:14:31Z Knowledge of the particle lidar ratio ( S λ ) and the particle linear depolarisation ratio ( δ λ ) for different aerosol types allows for aerosol typing and aerosol-type separation in lidar measurements. Reference values generally originate from dedicated lidar observations but might also be obtained from the inversion of AErosol RObotic NETwork (AERONET) sun/sky radiometer measurements. This study investigates the consistency of spectral S λ and δ λ provided in the recently released AERONET version 3 inversion product for observations of undiluted mineral dust in the vicinity of the following major deserts: Gobi, Sahara, Arabian, Great Basin, and Great Victoria. Pure dust conditions are identified by an Ångström exponent < 0.4 and a fine-mode fraction < 0.1. The values of spectral S λ are found to vary for the different source regions but generally show an increase with decreasing wavelength. The feature correlates to AERONET, retrieving an increase in the imaginary part of the refractive index with decreasing wavelength. The smallest values of S λ = 35–45 sr are found for mineral dust from the Great Basin desert, while the highest values of 50–70 sr have been inferred from AERONET observations of Saharan dust. Values of S λ at 675, 870, and 1020 nm seem to be in reasonable agreement with available lidar observations, while those at 440 nm are up to 10 sr higher than the lidar reference. The spectrum of δ λ shows a maximum of 0.26–0.31 at 1020 nm and decreasing values as wavelength decreases. AERONET-derived δ λ values at 870 and 1020 nm are in line with the lidar reference, while values of 0.19–0.24 at 440 nm are smaller than the independent lidar observations by a difference of 0.03 to 0.08. This general behaviour is consistent with earlier studies based on AERONET version 2 products. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 18 17 12735 12746 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 S.-K. Shin M. Tesche K. Kim M. Kezoudi B. Tatarov D. Müller Y. Noh On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Knowledge of the particle lidar ratio ( S λ ) and the particle linear depolarisation ratio ( δ λ ) for different aerosol types allows for aerosol typing and aerosol-type separation in lidar measurements. Reference values generally originate from dedicated lidar observations but might also be obtained from the inversion of AErosol RObotic NETwork (AERONET) sun/sky radiometer measurements. This study investigates the consistency of spectral S λ and δ λ provided in the recently released AERONET version 3 inversion product for observations of undiluted mineral dust in the vicinity of the following major deserts: Gobi, Sahara, Arabian, Great Basin, and Great Victoria. Pure dust conditions are identified by an Ångström exponent < 0.4 and a fine-mode fraction < 0.1. The values of spectral S λ are found to vary for the different source regions but generally show an increase with decreasing wavelength. The feature correlates to AERONET, retrieving an increase in the imaginary part of the refractive index with decreasing wavelength. The smallest values of S λ = 35–45 sr are found for mineral dust from the Great Basin desert, while the highest values of 50–70 sr have been inferred from AERONET observations of Saharan dust. Values of S λ at 675, 870, and 1020 nm seem to be in reasonable agreement with available lidar observations, while those at 440 nm are up to 10 sr higher than the lidar reference. The spectrum of δ λ shows a maximum of 0.26–0.31 at 1020 nm and decreasing values as wavelength decreases. AERONET-derived δ λ values at 870 and 1020 nm are in line with the lidar reference, while values of 0.19–0.24 at 440 nm are smaller than the independent lidar observations by a difference of 0.03 to 0.08. This general behaviour is consistent with earlier studies based on AERONET version 2 products. |
format |
Article in Journal/Newspaper |
author |
S.-K. Shin M. Tesche K. Kim M. Kezoudi B. Tatarov D. Müller Y. Noh |
author_facet |
S.-K. Shin M. Tesche K. Kim M. Kezoudi B. Tatarov D. Müller Y. Noh |
author_sort |
S.-K. Shin |
title |
On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product |
title_short |
On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product |
title_full |
On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product |
title_fullStr |
On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product |
title_full_unstemmed |
On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product |
title_sort |
on the spectral depolarisation and lidar ratio of mineral dust provided in the aeronet version 3 inversion product |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-12735-2018 https://doaj.org/article/9d4f4bf346b04d0aae8d958385fa1d53 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics, Vol 18, Pp 12735-12746 (2018) |
op_relation |
https://www.atmos-chem-phys.net/18/12735/2018/acp-18-12735-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-12735-2018 1680-7316 1680-7324 https://doaj.org/article/9d4f4bf346b04d0aae8d958385fa1d53 |
op_doi |
https://doi.org/10.5194/acp-18-12735-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
17 |
container_start_page |
12735 |
op_container_end_page |
12746 |
_version_ |
1766019696359899136 |