Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern Norway
<p>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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2019-07-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/12/4065/2019/amt-12-4065-2019.pdf |
| _version_ | 1818933679346417664 |
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| 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 |
| collection | DOAJ |
| description | <p>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<span class="inline-formula"><sup>∘</sup></span> N,
16<span class="inline-formula"><sup>∘</sup></span> E; 380 <span class="inline-formula">m</span> 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 <span class="inline-formula">nm</span>. 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.</p>
<p>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 <span class="inline-formula">nm</span>
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.</p> |
| first_indexed | 2024-12-20T04:52:13Z |
| format | Article |
| id | doaj.art-9476434c338c4e36979332a4a0fc831f |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-20T04:52:13Z |
| publishDate | 2019-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-9476434c338c4e36979332a4a0fc831f2022-12-21T19:52:50ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482019-07-01124065407610.5194/amt-12-4065-2019Year-round stratospheric aerosol backscatter ratios calculated from lidar measurements above northern NorwayA. Langenbach0G. Baumgarten1J. Fiedler2F.-J. Lübken3C. von Savigny4J. Zalach5Leibniz-Institut für Atmosphärenphysik an der Universität Rostock, Schlossstraße 6, 18225 Kühlungsborn, GermanyLeibniz-Institut für Atmosphärenphysik an der Universität Rostock, Schlossstraße 6, 18225 Kühlungsborn, GermanyLeibniz-Institut für Atmosphärenphysik an der Universität Rostock, Schlossstraße 6, 18225 Kühlungsborn, GermanyLeibniz-Institut für Atmosphärenphysik an der Universität Rostock, Schlossstraße 6, 18225 Kühlungsborn, GermanyInstitut für Physik, Universität Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald, GermanyInstitut für Physik, Universität Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany<p>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<span class="inline-formula"><sup>∘</sup></span> N, 16<span class="inline-formula"><sup>∘</sup></span> E; 380 <span class="inline-formula">m</span> 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 <span class="inline-formula">nm</span>. 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.</p> <p>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 <span class="inline-formula">nm</span> 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.</p>https://www.atmos-meas-tech.net/12/4065/2019/amt-12-4065-2019.pdf |
| spellingShingle | 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 Atmospheric Measurement Techniques |
| title | 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_short | 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 |
| url | https://www.atmos-meas-tech.net/12/4065/2019/amt-12-4065-2019.pdf |
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