| 1. |
- Jansson, Samuel, et al.
(författare)
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Exploitation of an atmospheric lidar network node in single-shot mode for the classification of aerofauna
- 2017
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Ingår i: Journal of Applied Remote Sensing. - 1931-3195. ; 11:3
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Tidskriftsartikel (refereegranskat)abstract
- The migration of aerofauna is a seasonal phenomenon of global scale, engaging billions of individuals in long-distance movements every year. Multiband lidar systems are commonly employed for the monitoring of aerosols and atmospheric gases, and a number of systems are operated regularly across Europe in the framework of the European Aerosol Lidar Network (EARLINET). This work examines the feasibility of utilizing EARLINET for the monitoring and classification of migratory fauna based on their pigmentation. An EARLINET Raman lidar system in Athens transmits laser pulses in three bands. By installing a four-channel digital oscilloscope on the system, the backscattered light from single-laser shots is measured. Roughly 100 h of data were gathered in the summer of 2013. The data were examined for aerofauna observations, and a total of 1735 observations interpreted as airborne organisms intercepting the laser beam were found during the study period in July to August 2013. The properties of the observations were analyzed spectrally and intercompared. A spectral multimodality that could be related to different observed species is shown. The system used in this pilot study is located in Athens, Greece. It is concluded that monitoring aerial migration using it and other similar systems is feasible with minor modifications, and that in-flight species classification could be possible.
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| 2. |
- Jansson, Samuel, et al.
(författare)
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Exploitation of Multi-Band Lidar for the Classification of Free-Flying Migratory Birds : A Pilot Study over Athens, Greece
- 2016
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Ingår i: EPJ Web of Conferences. - : EDP Sciences. - 2100-014X. ; 119
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Konferensbidrag (refereegranskat)abstract
- A multi-wavelength lidar system was used to detect free-flying birds passing over Athens, Greece. The location is strategically located in one of the important migratory corridors for birds migrating between Europe and Africa. Multiwavelength aerosol lidars are operated regularly across Europe in the frame of EARLINET. Here, the feasibility of using this existing infrastructure for assessing fluxes of migratory birds is explored. The backscattered lidar signals were detected at three elastic bands and one Raman band. The monitoring was extended over a period of three months covering predominantly the summer and early autumn period during which approximately 100 hours of lidar data was gathered.
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| 3. |
- Mei, Liang, et al.
(författare)
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First attempt to monitor atmospheric glyoxal using differential absorption lidar
- 2012
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Ingår i: Proceedings of the SPIE. - : SPIE. ; 853412
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Konferensbidrag (refereegranskat)abstract
- Glyoxal (CHOCHO), as an indicator of photochemical “hot spots”, was for the first time the subject of a differential absorption lidar (DIAL) campaign. The strongest absorption line of glyoxal in the blue wavelength region – 455.1 nm – was chosen as the experimental absorption wavelength. In order to handle the effects of absorption cross-section variation of the interfering gas – nitrogen dioxide (NO2) – three-wavelength DIAL measurements simultaneously detecting glyoxal and NO2, were performed. The differential absorption curves, recorded in July 2012, indicate an extremely low glyoxal concentration in Lund, Sweden, although it is expected to be peaking at this time of the year.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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