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| joydurado [2024/11/17 14:18] – created bpospich | joydurado [2024/11/17 14:59] (current) – bpospich |
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| ===== Principle ===== | ===== Principle ===== |
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| The W-Band cloud radar is a Frequency Modulated Continuous Wave (FMCW) Radar that transmits saw tooth frequency chirps at 94 GHz. In this way, vertical profiles of reflectivity, Doppler velocity, Doppler spectral width are detected from 150 m to 10 km above ground. Given these measurements, information on the macrophysical (cloud boundaries, type of cloud particles) and microphysical (e.g., liquid and ice water content) properties of the detected cloud can be derived. The radar is operated in a vertically pointing mode. Additionally, the system is equipped with a passive radiometric channel at 89 GHz that is sensible to cloud liquid water. Passive and active receivers are fed by the same antenna, i.e. a perfect beam overlap is accomplished. | JOYDURADO consists of two Frequency Modulated Continuous Wave (FMCW) radars that transmits saw tooth frequency chirps at 35 and 94 GHz. In this way, vertical profiles of reflectivity, Doppler velocity, Doppler spectral width are detected from 150 m to 10 km above ground. Given these measurements, information on the macrophysical (cloud boundaries, type of cloud particles) and microphysical (e.g., liquid and ice water content) properties of the detected cloud can be derived. From the dual-wavelength ratio and the polarimetric capabilites, additional information on particle shape and size can be derived. |
| | The two radars are mounted on a common frame so that both instruments can scan both in azimuth and elevation. |
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| | Additionally, the system is equipped with two passive radiometric channels at 31.4 and 89 GHz that are sensible to cloud liquid water. Passive and active receivers are fed by the same antennas, i.e. a perfect beam overlap is accomplished. |
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| ===== Measurement modes ===== | ===== Measurement modes ===== |
| * Check with co-located disdrometer to find out reflectivity offsets | * Check with co-located disdrometer to find out reflectivity offsets |
| * Consistency check with other cloud radars | * Consistency check with other cloud radars |
| | * Calibration of passive channels using HATPRO microwave radiometer spectra |
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| ===== Data availability ===== | ===== Data availability ===== |
| | Radar moments, Liquid water path | 5 seconds | 1 file per hour (8-12 MB) | //mirac_jue_-a_YYYYMMDDHHMMSS_P01_ZEN_compact.nc// | | | | Radar moments, Liquid water path | 5 seconds | 1 file per hour (8-12 MB) | //mirac_jue_-a_YYYYMMDDHHMMSS_P01_ZEN_compact.nc// | | |
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| ===== Composite products using W-Band radar data ===== | |
| * **Dual-wavelength ratio** Ka/W-Band [[http://gop.meteo.uni-koeln.de/~Hatpro/dataBrowser/dataBrowser2.html?site=TRIPEX-pol&date=-1&UpperLeft=3radar_Ze&UpperRight=3radar_DWR|Link to Quicklooks]] | |
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| ===== Link to current observations ===== | ===== Link to current observations ===== |
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| Data quicklooks can be found in the [[https://atmos.meteo.uni-koeln.de/~lpfitzen/dataBrowser/dataBrowser2.html?site=Mirac-A&date=-1&UpperLeft=Mirac-A_radar_overview&UpperRight=Mirac-A_radar_status|JOYCE quicklook archive]] | Data quicklooks can be found in the [[https://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser2.html?site=JOYCE&date=0&UpperLeft=JoyDuRad_35_overview&UpperRight=JoyDuRad_94_overview|JOYCE quicklook archive]] |
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| ===== Measurement examples ===== | |
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| {{wiki:examples:20191211_mirac-a_moments_overview.png?direct&500|JOYRAD-94_obs}} | |
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| //Example time series of MiRAC-A observations at JOYCE (radar moments / LWP)// | |
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| | ===== JOYDURADO History ===== |
| ===== JOYRAD-94 History ===== | |
| ^ Period ^ Place ^ Project ^ | ^ Period ^ Place ^ Project ^ |
| | 14/06/2019 - today | [[http://www.awipev.eu/|AWIPEV at Ny-Ålesund]], Norway | (AC)3 | | | 20/06/2024 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | |
| | 23/03/2018 - 06/03/2019 | [[http://gop.meteo.uni-koeln.de/ag_crewell/doku.php?id=sites:iquique|Iquique]], Chile | [[http://sfb1211.uni-koeln.de/|CRC1211]] | | |
| | 10/06/2016 - 26/07/2017 | [[http://www.awipev.eu/|AWIPEV at Ny-Ålesund]], Norway | (AC)3 | | |
| | 16/10/2015 - 23/03/2016 | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | | |
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| ===== MiRAC-A History ===== | |
| ^ Period ^ Device ^ Place ^ Project ^ | |
| | 11/12/2020 - today | MiRAC-A | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | | |
| | 08/2020 - 09/2020 | MiRAC-A | Polar 5, Svalbard | | | |
| | 31/05/2019 - 08/01/2020 | MiRAC-A | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | | |
| | 03/2019 - 04/2019 | MiRAC-A & -P | Polar 5, [[http://www.ac3-tr.de/overview/observations/aflux-2019/|AFLUX campaign]], Svalbard | [[http://www.ac3-tr.de/|(AC)3]] | | |
| | 28/07/2017 - 08/10/2018 | MiRAC-A & -P | [[http://www.awipev.eu/|AWIPEV Ny-Ålesund]], Svalbard | [[http://www.ac3-tr.de/|(AC)3]] | | |
| | 05/2017 - 07/2017 | MiRAC-A & -P | Polar 5, [[http://www.ac3-tr.de/news/acloud-campaign/|ACLOUD campaign]], Svalbard | [[http://www.ac3-tr.de/|(AC)3]] | | |
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| {{:wiki:instruments:mirac_a_nya.jpg?direct&600|MiRAC-A ©B. Pospichal}} \\ | |
| //MiRAC-A installed at Ny-Ålesund// | |
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