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| mrr [2020/08/30 15:35] – [Measurement modes] bpospich | mrr [2021/03/01 10:17] (current) – [Link to current observations] bpospich |
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| In case of rain the Doppler spectra can be used to derive vertical profiles of microphysical rain properties like drop size distribution and rain rate. | In case of rain the Doppler spectra can be used to derive vertical profiles of microphysical rain properties like drop size distribution and rain rate. |
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| The MRR system was also studied for its potential to observe snowfall ([[https://link.springer.com/article/10.1007/s00703-011-0142-z|Kneifel et al., 2011]]). Also, an improved MRR algorithm most suitable for snowfall observations has been developed at IGMK is freely available on [[https://github.com/maahn/IMProToo|Github]] | The MRR system was also studied for its potential to observe snowfall ([[https://link.springer.com/article/10.1007/s00703-011-0142-z|Kneifel et al., 2011]]). Also, an improved MRR algorithm **IMProToo** most suitable for snowfall observations has been developed at IGMK ([[https://amt.copernicus.org/articles/5/2661/2012/amt-5-2661-2012.html|Maahn and Kollias, 2012]]). It is freely available on [[https://github.com/maahn/IMProToo|Github]]. |
| ===== Measurement modes ===== | ===== Measurement modes ===== |
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| ===== JOYCE-CF Standard Operation Procedures ===== | ===== JOYCE-CF Standard Operation Procedures ===== |
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| * Standard measurement mode is vertically pointing, 2 second integration time | * Temporal resolution 10 seconds |
| * 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) | * Vertical resolution 35 meters (max. range = 1085 m) |
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| ===== Calibrations and data quality assurance procedures ===== | ===== Calibrations and data quality assurance procedures ===== |
| * Check with co-located disdrometer to find out reflectivity offsets | * ImProToo features a noise removal based on recognition of the most significant peak and a dynamic dealiasing routine which allows observations even if the Nyquist velocity range is exceeded. |
| * Consistency check with other cloud radars | |
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| ===== Data availability ===== | ===== Data availability ===== |
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| Some of the following data products are provided via Cloudnet [[https://cloudnet.fmi.fi/|ACTRIS cloudnet website]] with a temporal resolution of 30 seconds. If you would like to have additional data with better resolution or raw Doppler spectra please fill the {{ :joyce_data_request_form.pdf |data request sheet}} and send it to [[mailto:info@joyce.cloud|info@joyce.cloud]] | Data are available on request, please fill the {{ :joyce_data_request_form.pdf |data request sheet}} and send it to [[mailto:info@joyce.cloud|info@joyce.cloud]]. |
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| ^ Dataset ^ Temporal resolution ^ File size ^ Filename ^ Remarks ^ | ^ Dataset ^ Temporal resolution ^ File size ^ Filename ^ Remarks ^ |
| | Radar reflectivity factor | 30 seconds | 1 file per day (30-50 MB) | //YYYYMMDD_juelich_categorize.nc// | available via Cloudnet | | | Raw data (ASCII) | 10 seconds | 1 file per day (~15 MB) | //YYYYMMDD_jue_mrr_raw_txt.gz// | METEK format (zipped) | |
| | Doppler velocity | 30 seconds | 1 file per day (30-50 MB) | //YYYYMMDD_juelich_categorize.nc// | available via Cloudnet | | | IMProToo (NetCDF) | 1 minute | 1 file per day (20-30 MB) | //YYYYMMDD_jue_mrr_improtoo_0-101.nc.gz// | [[https://github.com/maahn/IMProToo|IMProToo]] product (zipped) | |
| | Spectral width | 30 seconds | 1 file per day (30-50 MB) | //YYYYMMDD_juelich_categorize.nc// | available via Cloudnet | | |
| | Linear depolarization ratio | 30 seconds | 1 file per day (30-50 MB) | //YYYYMMDD_juelich_categorize.nc// | available via Cloudnet | | |
| | Profiles of horizontal wind | 30 minutes | 1 file per day (30-50 MB) | //YYYYMMDD_joyrad35_wind_profile.nc// | | | |
| | Radar moments | 2 seconds | variable size (up to 30 MB/hour in case of thick clouds) | //YYYYMMDD_HHMM.mmclx.gz// | zipped NetCDF file | | |
| | Doppler spectra, Radar moments | 2 seconds | variable size (up to 2 GB/hour in case of thick clouds) | //YYYYMMDD_HHMM.znc// | NetCDF file | | |
| | Doppler spectra | 2 seconds | variable size (up to 1 GB/hour in case of thick clouds) | //YYYYMMDD_HHMM.zspc// | Binary file | | |
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| | Both available datasets include Doppler spectra, drop spectra, radar reflectivity, rain rate, and fall velocity. |
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| * **Dual-wavelength ratio** Ka/X-Band and 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]] | |
| * **Cloudnet target classification** uses Radar moments data from JOYRAD-35. Combined with microwave radiometer and ceilometer observation, clouds are characterized by their geometrical extent as well as their microphysical properties. | |
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| ===== Link to current observations ===== | ===== Link to current observations ===== |
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| Data quicklooks can be found in the [[http://gop.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser2.html?site=JOYCE&date=-1&UpperLeft=Joyrad35_Overview&UpperRight=Joyrad35_wind_ppi|JOYCE quicklook archive]] and in the [[https://guest.metek.de/skripts/animate_hourly_xcrl_skew.html?nic=juel|METEK archive]] | Data quicklooks can be found in the [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser3.html?site=JOYCE&date=-1&UpperLeft=MRR_IMProToo&UpperRight=MRR_AveData&LowerRight=Parsivel-Pluvio-MRR_precipitation-rate|JOYCE quicklook browser]]. |
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| ===== Measurement examples ===== | ===== Measurement examples ===== |
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| {{wiki:examples:200704_jue_l2_radar.png?direct&400|JOYRAD-35_obs}} | {{wiki:examples:20200617_jue_mrr_improtoo.png?direct&400|MRR_IMProToo}} |
| {{wiki:examples:20200704_joyrad35_wind_profile.png?direct&400|JOYRAD-35_wind}} \\ | {{wiki:examples:rr_pars_plu_mrr_20200617.png?direct&400|Rain_rate}} \\ |
| //Example time series of JOYRAD-35 observations (radar moments / horizontal wind)// | //Example time series of MRR observations (left: IMProToo radar reflectivity, spectral width, rain rate and mean spectral noise / right: rain rates from MRR (bottom), compared to Parsivel and Pluvio)// |
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| {{wiki:examples:20200704_juelich_classification.png?direct&800|Cloudnet_target_classification}} \\ | |
| //Example time series of Cloudnet target classification// | |
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| ===== JOYRAD-35 History ===== | ===== MRR History ===== |
| ^ Period ^ Place ^ Project ^ | ^ Period ^ Place ^ Project ^ |
| | 2017 | | Instrument upgrade | | | 03/2012 - today | Research Centre Jülich | [[http://www.tr32.de|TR32]] | |
| | 09/03/2012 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | | | 04/2008 - 10/2011 | [[http://www.fz-juelich.de/icg/icg-4/index.php?index=500|Selhausen]], Germany | [[http://www.tr32.de|TR32]] | |
| | 08/11/2011 - 08/03/2012 | Munich Airport, Germany| iPort campaign | | | 05 - 12/2007 | Heselbach, Blackforest, Germany | COPS | |
| | 03/2011 - 07/11/2011 | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | | | 2006 - 2007 | Nangatchori, Benin | [[http://amma-international.org/|AMMA]] | |
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| {{:wiki:instruments:joyrad35_07.jpg?direct&600|JOYRAD-35 ©B. Pospichal}} \\ | |
| //Cloud radar JOYRAD-35 installed at Jülich// | |
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