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 numb...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2010-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.pdf |
| _version_ | 1819154618731462656 |
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| author | I. S. Stachlewska C. Ritter |
| author_facet | I. S. Stachlewska C. Ritter |
| author_sort | I. S. Stachlewska |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-22T15:23:57Z |
| format | Article |
| id | doaj.art-a1aa0eaae99e4649be519ef79dd265bf |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-22T15:23:57Z |
| publishDate | 2010-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-a1aa0eaae99e4649be519ef79dd265bf2022-12-21T18:21:34ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242010-03-0110628132824On retrieval of lidar extinction profiles using Two-Stream and Raman techniquesI. S. StachlewskaC. RitterThe 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.http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.pdf |
| spellingShingle | I. S. Stachlewska C. Ritter On retrieval of lidar extinction profiles using Two-Stream and Raman techniques Atmospheric Chemistry and Physics |
| title | 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_short | 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 |
| url | http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.pdf |
| work_keys_str_mv | AT isstachlewska onretrievaloflidarextinctionprofilesusingtwostreamandramantechniques AT critter onretrievaloflidarextinctionprofilesusingtwostreamandramantechniques |