Abstract
We replaced a 1064-nm interference filter of a Polly-XT lidar system by a 1058-nm filter to observe pure rotational Raman backscattering from atmospheric Nitrogen and Oxygen. Polly-XT is compact Raman lidar with a Nd:YAG laser (20 Hz, 200 mJ at 1064 nm) and a 30-cm telescope mirror which applies photomultipliers in photoncounting mode. We present the first measured signals at 1058 nm and the derived extinction profile from measurements aboard RV Polarstern and in Leipzig. In combination with another Polly-XT system we could also derive particle backscatter and lidar ratio profiles at 1064 nm.
Highlights
The rotational Raman lidar (RRL) technique has been used for a long time, especially for temperature [1] and for aerosol extinction [2] measurements in the atmosphere
It was presented by Veselovskii et al [3] that nowadays the availability of specially designed interference filters can enable multiwavelength lidars to use the RRL technique as a replacement for the more traditional vibrational Raman lidar technique at 532 nm wavelength [4]
Haarig et al [5] showed for the first time the use of RRL at 1064 nm in order to independently measure the extinction coefficient at 1064 nm
Summary
The rotational Raman lidar (RRL) technique has been used for a long time, especially for temperature [1] and for aerosol extinction [2] measurements in the atmosphere It was presented by Veselovskii et al [3] that nowadays the availability of specially designed interference filters can enable multiwavelength lidars to use the RRL technique as a replacement for the more traditional vibrational Raman lidar technique at 532 nm wavelength [4]. This method is intriguing because on the one hand the RRL results in a factor of 20 more signal strength and on the other hand the assumption of the Angström exponent between elastic and inelastic vibration-rotational scattering is not needed which can reduce errors in backscatter and extinction retrieval methods. We employed the same filters that Haarig et al [5] used in one of our Polly-XT systems in order to test if the RRL method would be applicable for our smaller and automated systems
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