On retrieval of lidar extinction profiles using Two-Stream and Raman techniques
The Two-Stream technique employs simultaneous measurements performed by two elastic backscatter lidars pointing at each other to sample into the same atmosphere. It allows for a direct retrieval of the extinction coefficient profile from the ratio of the two involved lidar signals. During a number o...
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ftdoajarticles:oai:doaj.org/article:a1aa0eaae99e4649be519ef79dd265bf 2023-05-15T13:15:44+02:00 On retrieval of lidar extinction profiles using Two-Stream and Raman techniques I. S. Stachlewska C. Ritter 2010-03-01T00:00:00Z https://doaj.org/article/a1aa0eaae99e4649be519ef79dd265bf EN eng Copernicus Publications http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/a1aa0eaae99e4649be519ef79dd265bf Atmospheric Chemistry and Physics, Vol 10, Iss 6, Pp 2813-2824 (2010) Physics QC1-999 Chemistry QD1-999 article 2010 ftdoajarticles 2022-12-31T13:23:33Z The Two-Stream technique employs simultaneous measurements performed by two elastic backscatter lidars pointing at each other to sample into the same atmosphere. It allows for a direct retrieval of the extinction coefficient profile from the ratio of the two involved lidar signals. During a number of Alfred-Wegener-Institute (AWI) campaigns dedicated to Arctic research, the AWI's Polar 2 aircraft with the integrated onboard nadir-pointing Airborne Mobile Aerosol Lidar (AMALi) was utilised. The aircraft flew over a vicinity of Ny Ålesund on Svalbard, where the zenith-pointing Koldewey Aerosol Raman Lidar (KARL) has been located. This experimental approach gave the unique opportunity to retrieve the extinction profiles with a rarely used Two-Stream technique against a well established Raman technique. Both methods were applied to data obtained for clean Arctic conditions during the Arctic Study of Tropospheric clouds and Radiation (ASTAR 2004) campaign, and slightly polluted Arctic conditions during the Svalbard Experiment (SvalEx 2005) campaign. Successful comparison of both evaluation tools in different measurement conditions demonstrates sensitivity and feasibility of the Two-Stream method to obtain particle extinction and backscatter coefficients profiles without assumption of their relationship (lidar ratio). The method has the potential to serve as an extinction retrieval tool for KARL or AMALi simultaneous observations with the space borne CALIPSO lidar overpasses during the ASTAR 2007. Article in Journal/Newspaper Alfred Wegener Institute Arctic Ny Ålesund Ny-Ålesund Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Ny-Ålesund |
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 I. S. Stachlewska C. Ritter On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The Two-Stream technique employs simultaneous measurements performed by two elastic backscatter lidars pointing at each other to sample into the same atmosphere. It allows for a direct retrieval of the extinction coefficient profile from the ratio of the two involved lidar signals. During a number of Alfred-Wegener-Institute (AWI) campaigns dedicated to Arctic research, the AWI's Polar 2 aircraft with the integrated onboard nadir-pointing Airborne Mobile Aerosol Lidar (AMALi) was utilised. The aircraft flew over a vicinity of Ny Ålesund on Svalbard, where the zenith-pointing Koldewey Aerosol Raman Lidar (KARL) has been located. This experimental approach gave the unique opportunity to retrieve the extinction profiles with a rarely used Two-Stream technique against a well established Raman technique. Both methods were applied to data obtained for clean Arctic conditions during the Arctic Study of Tropospheric clouds and Radiation (ASTAR 2004) campaign, and slightly polluted Arctic conditions during the Svalbard Experiment (SvalEx 2005) campaign. Successful comparison of both evaluation tools in different measurement conditions demonstrates sensitivity and feasibility of the Two-Stream method to obtain particle extinction and backscatter coefficients profiles without assumption of their relationship (lidar ratio). The method has the potential to serve as an extinction retrieval tool for KARL or AMALi simultaneous observations with the space borne CALIPSO lidar overpasses during the ASTAR 2007. |
format |
Article in Journal/Newspaper |
author |
I. S. Stachlewska C. Ritter |
author_facet |
I. S. Stachlewska C. Ritter |
author_sort |
I. S. Stachlewska |
title |
On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
title_short |
On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
title_full |
On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
title_fullStr |
On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
title_full_unstemmed |
On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
title_sort |
on retrieval of lidar extinction profiles using two-stream and raman techniques |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doaj.org/article/a1aa0eaae99e4649be519ef79dd265bf |
geographic |
Arctic Svalbard Ny-Ålesund |
geographic_facet |
Arctic Svalbard Ny-Ålesund |
genre |
Alfred Wegener Institute Arctic Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Alfred Wegener Institute Arctic Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Atmospheric Chemistry and Physics, Vol 10, Iss 6, Pp 2813-2824 (2010) |
op_relation |
http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/a1aa0eaae99e4649be519ef79dd265bf |
_version_ |
1766270771214155776 |