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The Stream Line
LiDAR can be used to detect and track elevated levels of certain
pollutants in the atmosphere. The data examples below show the LiDAR
detecting volcanic ash, farm crop spraying aerosols and forest fire
smoke plumes. |
| Crop
spraying pollution dispersion. |
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was collected with the Stream Line sited close to a field that was being
sprayed by a crop sprayer.
The LiDAR was staring at 10 degrees elevation at a diagonal
orientation to the wind flow.
The 6km range corresponds to the line
of site range - so at 6km, the height above ground level was
approximately 1km. The screenshot represents ~ 6.5 minutes in time.
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Smoke detection from
Russian forest fires during deployment in Helsinki, Finland in
August 2006. |
Left.
A satellite view showing the fire location and the smoke spreading
towards Finland and heading for Helsinki.
Below. A LiDAR data plot
showing the backscatter levels rising as the smoke reaches the FMI
testbed site at Helsinki.
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Volcanic
ash cloud detection and monitoring. The Halo Photonics LiDAR
operating in Manchester was the first LiDAR in the UK to detect the
ash cloud from the Eyjafjallajokull volcano.
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data is from the Chilbolton Doppler LiDAR, which is also fitted with
a de-polarisation channel. The ash shown drifting down at
approximately 12:00 and enters the boundary layer at 15:00. In the
de-polarisation ratio plot at the bottom, the ash can be seen to
fill the turbulent boundary layer. |
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This
data, also from the 16th of April 2010, was collected by the Halo
LiDAR at the Met Office research site at Cardington.
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