1064 nm rotational Raman lidar for particle extinction and lidar-ratio profiling: cirrus case study
For the first time, vertical profiles of the 1064 nm particle extinction coefficient obtained from Raman lidar observations at 1058 nm (nitrogen and oxygen rotational Raman backscatter) are presented. We applied the new technique in the framework of test measurements and performed several cirrus obs...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/9/4269/2016/amt-9-4269-2016.pdf |
| Summary: | For the first time, vertical profiles of the 1064 nm particle extinction
coefficient obtained from Raman lidar observations at 1058 nm (nitrogen and
oxygen rotational Raman backscatter) are presented. We applied the new
technique in the framework of test measurements and performed several cirrus
observations of particle backscatter and extinction coefficients, and
corresponding extinction-to-backscatter ratios at the wavelengths of 355,
532, and 1064 nm. The cirrus backscatter coefficients were found to be equal
for all three wavelengths keeping the retrieval uncertainties in mind. The
multiple-scattering-corrected cirrus extinction coefficients at 355 nm were
on average about 20–30 % lower than the ones for 532 and 1064 nm. The
cirrus-mean extinction-to-backscatter ratio (lidar ratio) was 31 ± 5 sr
(355 nm), 36 ± 5 sr (532 nm), and 38 ± 5 sr (1064 nm) in this single
study. We further discussed the requirements needed to obtain aerosol
extinction profiles in the lower troposphere at 1064 nm with good accuracy
(20 % relative uncertainty) and appropriate temporal and vertical resolution. |
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| ISSN: | 1867-1381 1867-8548 |