windlidar
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windlidar [2020/08/31 21:03] – [Instruments at JOYCE / University of Cologne] bpospich | windlidar [2021/03/01 11:47] – [Measurement examples] bpospich | ||
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===== Measurement modes ===== | ===== Measurement modes ===== | ||
- | * Vertically pointing observations with integration times of 15 seconds | + | * Vertical staring mode (1.67 seconds |
+ | * Full azimuth and elevation scan capability | ||
+ | |||
===== JOYCE-CF Standard Operation Procedures ===== | ===== JOYCE-CF Standard Operation Procedures ===== | ||
- | * Standard measurement modes are | + | |
- | * Vertical resolution 15 m, maximum range 15 km (CHM15k) | + | The instrument performs several scanning patterns and uses the remaining time for vertical staring. |
- | * Vertical resolution 30 m, maximum range 7.5 km (CT25K) | + | |
+ | Scan patterns | ||
+ | |||
+ | * Every 5 minutes doppler beam swinging (DBS) (12×14sec/ | ||
+ | * Directly followed by a 3 beam VAD (VAD-3) (12×14sec/ | ||
+ | * Every 15 minutes a velocity azimuth display scan (VAD-36) (4×124sec/ | ||
+ | * Every 60 minutes a range height indicator | ||
+ | * The rest of the time is vertical staring, i.e. vertical staring is interrupted every 5 minutes and sums up to 47minutes/ | ||
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^ Dataset | ^ Dataset | ||
- | | Uncalibrated attenuated backscatter | + | | Vertical stare data (Backscatter, |
- | | Mixing layer height | + | | 3D wind profiles from custom scanning |
- | | Backscatter, | + | | 3D wind profiles from Doppler beam swinging |
- | | Backscatter, | + | | Mixing layer height |
+ | | 3D wind profiles from VAD-36 | ||
+ | |||
+ | |||
- | ===== Composite products using data from Ceilometer ===== | ||
- | * **Cloudnet target classification** uses cloud base height observations from the CT25K-Ceilometer. Combined with cloud radar and microwave radiometer observation, | ||
===== Link to current observations ===== | ===== Link to current observations ===== | ||
- | Current observations at [[http://gop.meteo.uni-koeln.de/ | + | Current observations at [[http://atmos.meteo.uni-koeln.de/ |
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===== Measurement examples ===== | ===== Measurement examples ===== | ||
- | {{wiki:examples: | + | Current wind profile: |
- | {{wiki:examples: | + | {{https:// |
- | //Time series of brightness temperatures | + | |
+ | Current VAD plot:\\ | ||
+ | {{http:// | ||
+ | |||
+ | //The figure shows a velocity azimuth display | ||
+ | Color shading gives the backscatter coefficient. | ||
+ | // | ||
+ | |||
+ | [[http:// | ||
+ | ===== Doppler lidar History ===== | ||
+ | ^ Period | ||
+ | | 12.9.2012 - | ||
+ | | 26.7.2012 - 31.8.2012 | [[https:// | ||
+ | | 7.11.2011 - 26.7.2012 | [[http:// | ||
===== Technical specifications ===== | ===== Technical specifications ===== | ||
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| Field-of-View / deg | 360 x 90 | free alingment of the beam | | | Field-of-View / deg | 360 x 90 | free alingment of the beam | | ||
| maximum range / m | 9000 | adjustable, but restriced to sufficent backscatter (aerosol, cloud droplets or ice crystals) | | maximum range / m | 9000 | adjustable, but restriced to sufficent backscatter (aerosol, cloud droplets or ice crystals) | ||
- | | velocity resolution / ms$^{-1}$ | 0.0382 | + | | velocity resolution / ms<sup>-1</ |
- | | velocity precsision / ms$^{-1}$ | < 0.20 | for SNR > -17dB | | + | | velocity precsision / ms<sup>-1</ |
- | | max velocity / ms$^{-1}$ | 19.2 | = Nyquist Velocity (adjustable) | + | | max velocity / ms<sup>-1</ |
- | | Aperture / mm (area /m$^2$) | 75 (4.417e-3) | + | | Aperture / mm (area /m<sup>2</ |
| Size / cm³ | 80 x 53 x 40 | | | | Size / cm³ | 80 x 53 x 40 | | | ||
| Average Power consumption / W | 140/250 [600] | (wo/w Heating/ | | Average Power consumption / W | 140/250 [600] | (wo/w Heating/ |
windlidar.txt · Last modified: 2022/01/20 23:36 by bpospich