radiation
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| radiation [2020/08/31 13:25] – [Measurement modes] bpospich | radiation [2021/03/01 10:19] (current) – [Link to current observations] bpospich | ||
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| ===== Principle ===== | ===== Principle ===== | ||
| - | Two pyranometers (CMP 21), a pyrheliometer (CHP 1) and a pyrgeometer (CGR 4) are used to measure solar shortwave radiation and terrestrial longwave radiation. One pyranometer receives total downward solar irradiance. The other instruments are mounted on a suntracker (SOLYS 2) measuring diffuse downward solar irradiance (shaded pyranometer), | + | Two pyranometers (CMP 21), a pyrheliometer (CHP 1) and a pyrgeometer (CGR 4) are used to measure solar shortwave radiation and terrestrial longwave radiation. One pyranometer receives total downward solar irradiance. The other instruments are mounted on a suntracker (SOLYS 2) measuring diffuse downward solar irradiance (shaded pyranometer), |
| ===== JOYCE-CF Standard Operation Procedures ===== | ===== JOYCE-CF Standard Operation Procedures ===== | ||
| - | * Standard | + | * Standard |
| - | * Every 30 minutes one azimuth scan at 83° elevation angle with 6° azimuth resolution (duration ~2 minutes) for horizontal wind within clouds and the boundary layer (if sufficient insects are present) | + | |
| ===== Calibrations and data quality assurance procedures ===== | ===== Calibrations and data quality assurance procedures ===== | ||
| - | * Check with co-located disdrometer to find out reflectivity offsets | + | * Regular instrument calibration performed |
| - | * Consistency | + | * Cross-check with other radiation sensors |
| ===== Data availability ===== | ===== Data availability ===== | ||
| - | Some of the following data products are provided via Cloudnet [[https:// | + | The following data products are provided via the SAMD database. If you would like to have additional data or recent data that have not been uploaded to SAMD yet, please fill the {{ : |
| ^ Dataset | ^ Dataset | ||
| - | | Radar reflectivity factor | + | | Downwelling shortwave irradiance |
| - | | Doppler velocity | + | | Downwelling longwave irradiance |
| - | | Spectral width | 30 seconds | + | |
| - | | Linear depolarization ratio | 30 seconds | + | |
| - | | Profiles of horizontal wind | 30 minutes | 1 file per day (30-50 MB) | // | + | |
| - | | Radar moments | + | |
| - | | Doppler spectra, Radar moments | + | |
| - | | Doppler spectra | + | |
| - | ===== Composite products using data from JOYRAD-35 ===== | ||
| - | * **Dual-wavelength ratio** Ka/X-Band and Ka/W-Band [[http:// | ||
| - | * **Cloudnet target classification** uses Radar moments data from JOYRAD-35. Combined with microwave radiometer and ceilometer observation, | ||
| ===== Link to current observations ===== | ===== Link to current observations ===== | ||
| - | Data quicklooks can be found in the [[http://gop.meteo.uni-koeln.de/ | + | Data quicklooks can be found in the [[http://atmos.meteo.uni-koeln.de/ |
| ===== Measurement examples ===== | ===== Measurement examples ===== | ||
| - | {{wiki: | + | {{wiki: |
| - | {{wiki: | + | |
| - | //Example time series of JOYRAD-35 observations (radar moments / horizontal wind)// | + | |
| - | {{wiki: | ||
| - | //Example time series of Cloudnet target classification// | ||
| - | + | ===== History ===== | |
| - | + | ||
| - | ===== JOYRAD-35 | + | |
| ^ Period | ^ Period | ||
| - | | 2017 | | + | | |
| - | | 09/ | + | |
| - | | 08/11/2011 - 08/03/2012 | Munich Airport, Germany| iPort campaign | | + | |
| - | | 03/2011 - 07/11/2011 | [[http:// | + | |
| - | + | Total solar irradiance measurements started in 2006, pyrgeometer measurments in 2011, suntracker measurements in 2014. | |
| - | {{: | + | |
| - | //Cloud radar JOYRAD-35 installed at Jülich// | + | |
| ===== Technical Specifications ===== | ===== Technical Specifications ===== | ||
| - | ^ Parameter | + | |
| - | | Frequency | 35.5 ± 0.15 GHz | corresponds to wavelength of 8.5 mm | | + | ^ Parameter |
| - | | Peak power (max) | 25 kW | | + | | Total solar irradiance (CMP 21)| Secondary standard |
| - | | Average power | ~ 24 W | | | + | | Diffuse solar irradiance |
| - | | Pulse width | 200 ns | adjustable | + | | Direct solar irradiance |
| - | | Pulse repetition frequency | 5 kHz | adjustable | + | | Terrestrial irradiance |
| - | | Minimum height | 150 m | full sensitivity above 400 m | + | | Manufacturer |
| - | | Measuring range | 15 km | adjustable | + | | Data logger |
| - | | Range resolution | 30 m | adjustable | + | | Manufacturer | Campbell Scientific Inc., UK | |
| - | | Antenna beam width | 0.6° | | | + | |
| - | | Doppler velocity resolution | 0.025 m/s | depends on FFT length | | + | |
| - | | Maximum unambiguous velocity | ±20 m/s | | | + | |
| - | | Maximum sensitivity at 5 km (integration 0.1 s) | -45 dBZ | | | + | |
| - | | Calibration system accuracy | + | |
| - | | Number of gates (with simultaneous stored raw data) | 500 | | | + | |
| - | | Number of averaging spectra | 200 | adjustable (1-32768) | + | |
| - | | Manufacturer | [[http:// | + | |
| - | | | + | |
radiation.1598880352.txt.gz · Last modified: 2020/08/31 13:25 by bpospich