Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway
We present a new method for calculating backscatter ratios of the stratospheric sulfate aerosol (SSA) layer from daytime and nighttime lidar measurements. Using this new method we show a first year-round dataset of stratospheric aerosol backscatter ratios at high latitudes. The SSA layer is located...
Published in: | Atmospheric Measurement Techniques |
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ftcopernicus:oai:publications.copernicus.org:amt74638 2023-05-15T15:11:09+02:00 Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway Langenbach, Arvid Baumgarten, Gerd Fiedler, Jens Lübken, Franz-Josef Savigny, Christian Zalach, Jacob 2019-07-24 application/pdf https://doi.org/10.5194/amt-12-4065-2019 https://amt.copernicus.org/articles/12/4065/2019/ eng eng doi:10.5194/amt-12-4065-2019 https://amt.copernicus.org/articles/12/4065/2019/ eISSN: 1867-8548 Text 2019 ftcopernicus https://doi.org/10.5194/amt-12-4065-2019 2020-07-20T16:22:44Z We present a new method for calculating backscatter ratios of the stratospheric sulfate aerosol (SSA) layer from daytime and nighttime lidar measurements. Using this new method we show a first year-round dataset of stratospheric aerosol backscatter ratios at high latitudes. The SSA layer is located at altitudes between the tropopause and about 30 km. It is of fundamental importance for the radiative balance of the atmosphere. We use a state-of-the-art Rayleigh–Mie–Raman lidar at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) station located in northern Norway (69 ∘ N, 16 ∘ E; 380 m a.s.l.). For nighttime measurements the aerosol backscatter ratios are derived using elastic and inelastic backscatter of the emitted laser wavelengths 355, 532 and 1064 nm . The setup of the lidar allows measurements with a resolution of about 5 min in time and 150 m in altitude to be performed in high quality, which enables the identification of multiple sub-layers in the stratospheric aerosol layer of less than 1 km vertical thickness. We introduce a method to extend the dataset throughout the summer when measurements need to be performed under permanent daytime conditions. For that purpose we approximate the backscatter ratios from color ratios of elastic scattering and apply a correction function. We calculate the correction function using the average backscatter ratio profile at 355 nm from about 1700 h of nighttime measurements from the years 2000 to 2018. Using the new method we finally present a year-round dataset based on about 4100 h of measurements during the years 2014 to 2017. Text Arctic Northern Norway Copernicus Publications: E-Journals Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Arctic Norway Atmospheric Measurement Techniques 12 7 4065 4076 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We present a new method for calculating backscatter ratios of the stratospheric sulfate aerosol (SSA) layer from daytime and nighttime lidar measurements. Using this new method we show a first year-round dataset of stratospheric aerosol backscatter ratios at high latitudes. The SSA layer is located at altitudes between the tropopause and about 30 km. It is of fundamental importance for the radiative balance of the atmosphere. We use a state-of-the-art Rayleigh–Mie–Raman lidar at the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) station located in northern Norway (69 ∘ N, 16 ∘ E; 380 m a.s.l.). For nighttime measurements the aerosol backscatter ratios are derived using elastic and inelastic backscatter of the emitted laser wavelengths 355, 532 and 1064 nm . The setup of the lidar allows measurements with a resolution of about 5 min in time and 150 m in altitude to be performed in high quality, which enables the identification of multiple sub-layers in the stratospheric aerosol layer of less than 1 km vertical thickness. We introduce a method to extend the dataset throughout the summer when measurements need to be performed under permanent daytime conditions. For that purpose we approximate the backscatter ratios from color ratios of elastic scattering and apply a correction function. We calculate the correction function using the average backscatter ratio profile at 355 nm from about 1700 h of nighttime measurements from the years 2000 to 2018. Using the new method we finally present a year-round dataset based on about 4100 h of measurements during the years 2014 to 2017. |
format |
Text |
author |
Langenbach, Arvid Baumgarten, Gerd Fiedler, Jens Lübken, Franz-Josef Savigny, Christian Zalach, Jacob |
spellingShingle |
Langenbach, Arvid Baumgarten, Gerd Fiedler, Jens Lübken, Franz-Josef Savigny, Christian Zalach, Jacob Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
author_facet |
Langenbach, Arvid Baumgarten, Gerd Fiedler, Jens Lübken, Franz-Josef Savigny, Christian Zalach, Jacob |
author_sort |
Langenbach, Arvid |
title |
Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
title_short |
Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
title_full |
Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
title_fullStr |
Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
title_full_unstemmed |
Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
title_sort |
year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern norway |
publishDate |
2019 |
url |
https://doi.org/10.5194/amt-12-4065-2019 https://amt.copernicus.org/articles/12/4065/2019/ |
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-12-4065-2019 https://amt.copernicus.org/articles/12/4065/2019/ |
op_doi |
https://doi.org/10.5194/amt-12-4065-2019 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
12 |
container_issue |
7 |
container_start_page |
4065 |
op_container_end_page |
4076 |
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