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...
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ftdoajarticles:oai:doaj.org/article:9476434c338c4e36979332a4a0fc831f 2023-05-15T15:13:22+02:00 Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway A. Langenbach G. Baumgarten J. Fiedler F.-J. Lübken C. von Savigny J. Zalach 2019-07-01T00:00:00Z https://doi.org/10.5194/amt-12-4065-2019 https://doaj.org/article/9476434c338c4e36979332a4a0fc831f EN eng Copernicus Publications https://www.atmos-meas-tech.net/12/4065/2019/amt-12-4065-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-4065-2019 1867-1381 1867-8548 https://doaj.org/article/9476434c338c4e36979332a4a0fc831f Atmospheric Measurement Techniques, Vol 12, Pp 4065-4076 (2019) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2019 ftdoajarticles https://doi.org/10.5194/amt-12-4065-2019 2022-12-31T10:34:44Z 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. Article in Journal/Newspaper Arctic Northern Norway Directory of Open Access Journals: DOAJ Articles Arctic Norway Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Atmospheric Measurement Techniques 12 7 4065 4076 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 A. Langenbach G. Baumgarten J. Fiedler F.-J. Lübken C. von Savigny J. Zalach Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
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 |
Article in Journal/Newspaper |
author |
A. Langenbach G. Baumgarten J. Fiedler F.-J. Lübken C. von Savigny J. Zalach |
author_facet |
A. Langenbach G. Baumgarten J. Fiedler F.-J. Lübken C. von Savigny J. Zalach |
author_sort |
A. Langenbach |
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 |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/amt-12-4065-2019 https://doaj.org/article/9476434c338c4e36979332a4a0fc831f |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) |
geographic |
Arctic Norway Alomar |
geographic_facet |
Arctic Norway Alomar |
genre |
Arctic Northern Norway |
genre_facet |
Arctic Northern Norway |
op_source |
Atmospheric Measurement Techniques, Vol 12, Pp 4065-4076 (2019) |
op_relation |
https://www.atmos-meas-tech.net/12/4065/2019/amt-12-4065-2019.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-12-4065-2019 1867-1381 1867-8548 https://doaj.org/article/9476434c338c4e36979332a4a0fc831f |
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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1766343922884280320 |