Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations
We report on the retrieval of stratospheric aerosol particle size and extinction coefficient profiles from multi-color backscatter measurements with the Rayleigh-Mie-Raman lidar operated at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) in northern Norway. The retrievals are ba...
Main Authors: | , , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://doi.org/10.5194/amt-2019-267 https://amt.copernicus.org/preprints/amt-2019-267/ |
id |
ftcopernicus:oai:publications.copernicus.org:amtd77880 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:amtd77880 2023-05-15T15:07:35+02:00 Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations Zalach, Jacob Savigny, Christian Langenbach, Arvid Baumgarten, Gerd Lübken, Franz-Josef Bourassa, Adam 2019-07-25 application/pdf https://doi.org/10.5194/amt-2019-267 https://amt.copernicus.org/preprints/amt-2019-267/ eng eng doi:10.5194/amt-2019-267 https://amt.copernicus.org/preprints/amt-2019-267/ eISSN: 1867-8548 Text 2019 ftcopernicus https://doi.org/10.5194/amt-2019-267 2020-07-20T16:22:44Z We report on the retrieval of stratospheric aerosol particle size and extinction coefficient profiles from multi-color backscatter measurements with the Rayleigh-Mie-Raman lidar operated at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) in northern Norway. The retrievals are based on a two-step approach. In a first step the median radius of an assumed log-normal particle size distribution with fixed width is retrieved based on the color ratio formed from the measured backscatter ratios at wavelenghts of 1064 nm and 532 nm. An intrinsic ambiguity of the retrieved aerosol size information is discussed. In a second step, this particle size information is used to convert the measured lidar backscatter ratio to aerosol extinction coefficients. The retrieval is currently based on monthly-averaged lidar measurements covering the period from the year 2000 to present. A sensitivity study is presented that allows establishing an error budged for the aerosol retrievals. Assuming a log-normal aerosol particle size distribution with a geometric width of S = 1.3, median radii on the order of 100 nm are retrieved. The median radii are found to generally decrease with increasing altitude. The retrieved aerosol extinction profiles are compared to observations with various current and past satellite instruments. Text Arctic Northern Norway Copernicus Publications: E-Journals Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Arctic Norway |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We report on the retrieval of stratospheric aerosol particle size and extinction coefficient profiles from multi-color backscatter measurements with the Rayleigh-Mie-Raman lidar operated at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) in northern Norway. The retrievals are based on a two-step approach. In a first step the median radius of an assumed log-normal particle size distribution with fixed width is retrieved based on the color ratio formed from the measured backscatter ratios at wavelenghts of 1064 nm and 532 nm. An intrinsic ambiguity of the retrieved aerosol size information is discussed. In a second step, this particle size information is used to convert the measured lidar backscatter ratio to aerosol extinction coefficients. The retrieval is currently based on monthly-averaged lidar measurements covering the period from the year 2000 to present. A sensitivity study is presented that allows establishing an error budged for the aerosol retrievals. Assuming a log-normal aerosol particle size distribution with a geometric width of S = 1.3, median radii on the order of 100 nm are retrieved. The median radii are found to generally decrease with increasing altitude. The retrieved aerosol extinction profiles are compared to observations with various current and past satellite instruments. |
format |
Text |
author |
Zalach, Jacob Savigny, Christian Langenbach, Arvid Baumgarten, Gerd Lübken, Franz-Josef Bourassa, Adam |
spellingShingle |
Zalach, Jacob Savigny, Christian Langenbach, Arvid Baumgarten, Gerd Lübken, Franz-Josef Bourassa, Adam Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations |
author_facet |
Zalach, Jacob Savigny, Christian Langenbach, Arvid Baumgarten, Gerd Lübken, Franz-Josef Bourassa, Adam |
author_sort |
Zalach, Jacob |
title |
Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations |
title_short |
Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations |
title_full |
Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations |
title_fullStr |
Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations |
title_full_unstemmed |
Challenges in retrieving stratospheric aerosol extinction and particle size from ground-based RMR-LIDAR observations |
title_sort |
challenges in retrieving stratospheric aerosol extinction and particle size from ground-based rmr-lidar observations |
publishDate |
2019 |
url |
https://doi.org/10.5194/amt-2019-267 https://amt.copernicus.org/preprints/amt-2019-267/ |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) |
geographic |
Alomar Arctic Norway |
geographic_facet |
Alomar Arctic Norway |
genre |
Arctic Northern Norway |
genre_facet |
Arctic Northern Norway |
op_source |
eISSN: 1867-8548 |
op_relation |
doi:10.5194/amt-2019-267 https://amt.copernicus.org/preprints/amt-2019-267/ |
op_doi |
https://doi.org/10.5194/amt-2019-267 |
_version_ |
1766339058372444160 |