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instruments:mfrsr:mfrsr [2015/07/10 11:40] – kerstininstruments:mfrsr:mfrsr [2020/04/15 10:15] – [Data] pkrobot
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-====== Cloud Radar MIRA-36 ====== +====== Multi-Filter Rotating Shadowband Radiometer ====== 
-//Mentor: [[http://www.geomet.uni-koeln.de/en/general/the-institute/staff/detailed-view/7499a6dd25b9423c9e12d40729f676b9/?tx_wtdirectory_pi1[show]=148&tx_rggooglemap_pi1[poi]=148|E. Orlandi]], [[http://www.geomet.uni-koeln.de/en/general/the-institute/staff/detailed-view/1533c00ee5ed245e71ff90464a63e700/?tx_wtdirectory_pi1[show]=33&tx_rggooglemap_pi1[poi]=33|K. Ebell]]//+//Mentor: [[http://www.geomet.uni-koeln.de/das-institut/mitarbeiter/ebell/|K. Ebell]]//
  
 ===== Principle ===== ===== Principle =====
-The cloud radar MIRA is a Doppler radar that transmits a linear polarized signal at 35.5 GHz and receives co- and cross-polarized signals simultaneously. In this way, vertical profiles of reflectivity, Doppler velocity, Doppler spectral width and of linear depolarization ratio are detected from 150 m to 15 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 can be operated in a vertically pointing mode but also has scanning capabilities in order to better capture the 3-dimensional structure of the cloud.+The Multifilter Rotating Shadowband Radiometer (MFRSR) is a passive instrument that measures global and diffuse components of solar irradiance at one broadband channel and at six narrowband channels, i. e. at 415, 500, 615, 673, 870, and 940 nm. Direct irradiance is subsequently calculated from the diffuse and global measured components. Each MFRSR measurement sequence includes measurements at four different shadowband positions: 1) at nadir (home position), 2) at the first side-band position, 3) sun-blocked, 4) at the second side-band position. The side-band measurements are used to correct for the portion of the sky obscured by the shadowband. From the MFRSR measurements, the aerosol optical depth at the wavelengths 415, 500, 615, 673 and 870 nm as well as the Angstrom exponent can be derived. For single-layer "horizontally homogeneous" liquid clouds, layer cloud optical depth and effective radius can also be retrieved.
  
 ===== Instrument ===== ===== Instrument =====
-{{:instruments:mira:mira_joyce.jpg?350}}+{{:instruments:mfrsr:mfrsr.jpg?300|}}
  
-MIRA36-S ([[http://www.metek.de/|Metek]]) at [[http://www.fz-juelich.de/|Forschungszentrum Jülich]] on the roof of the IEK-8 ([[http://www2.fz-juelich.de/icg/icg-2/|Institut für Energie- und Klimaforschung: Troposphäre]]).+[[http://www.yesinc.com/|YES Inc.]] [[http://www.yesinc.com/products/data/mfr7/index.html|MFR-7]]  
 +at [[http://www.fz-juelich.de/|Forschungszentrum Jülich]] on the roof of the IEK-8 ([[http://www2.fz-juelich.de/icg/icg-2/|Institut für Energie- und Klimaforschung: Troposphäre]]).
  
 ===== Data ===== ===== Data =====
  
-  * If you are interested in receiving data please contact the instrument mentors: // [[http://www.geomet.uni-koeln.de/en/general/the-institute/staff/detailed-view/7499a6dd25b9423c9e12d40729f676b9/?tx_wtdirectory_pi1[show]=148&tx_rggooglemap_pi1[poi]=148|E. Orlandi]], [[http://www.geomet.uni-koeln.de/en/general/the-institute/staff/detailed-view/1533c00ee5ed245e71ff90464a63e700/?tx_wtdirectory_pi1[show]=33&tx_rggooglemap_pi1[poi]=33|K. Ebell]]//+  * If you are interested in receiving data please contact the instrument mentors: // [[http://www.geomet.uni-koeln.de/en/general/the-institute/staff/detailed-view/1533c00ee5ed245e71ff90464a63e700/?tx_wtdirectory_pi1[show]=33&tx_rggooglemap_pi1[poi]=33|K. Ebell]]//
  
-  * [[http://gop.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser2.html?site=JOYCE&date=-1&UpperLeft=Mira_Hatpo-Overview&UpperRight=Mira_CN-Classification | Quicklook archive]]+  * [[http://gop.meteo.uni-koeln.de/~Hatpro/dataBrowser/dataBrowser2.html?site=JOYCE&date=-1&UpperLeft=MFRSR_Broadband&UpperRight=MFRSR_Narrowband | Quicklook archive]]
  
 Current measurements: Current measurements:
  
 <html> <html>
-      <a href="http://gop.meteo.uni-koeln.de/~hatpro/jue/VAPs/radar_mwr/latest_l2_radar_lwp.png" target="_blank"> +      <a href="http://gop.meteo.uni-koeln.de/~Hatpro/quicklooks/obs/site/jue/mfrsr/l1/latest_mfrsr_jue_l1_broadband.png" target="_blank"> 
-      <img src="http://gop.meteo.uni-koeln.de/~hatpro/jue/VAPs/radar_mwr/latest_l2_radar_lwp.png" width=300>+      <img src="http://gop.meteo.uni-koeln.de/~Hatpro/quicklooks/obs/site/jue/mfrsr/l1/latest_mfrsr_jue_l1_broadband.png" width=300>
       </a> click to enlarge       </a> click to enlarge
 </html>  </html> 
  
-The figure shows the LWP from the HATPRO MWR as well as radar reflectivity factor, linear depolarization ratio, Doppler velocity and Doppler spectral width of MIRA zenith measurements.\\ +The figure shows the total hemispheric (top), the diffuse hemispheric (middle) and the direct normal irradiance (bottom) from the broadband channel of the MFRSR.
-Gray areas indicate no data. +
  
 ===== History ===== ===== History =====
 ^  Period  ^  Place  ^  Project  ^ ^  Period  ^  Place  ^  Project  ^
-| 09/03/2012 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE | +| 06/07/2015 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE |
-| 08/11/2011 - 08/03/2012 | Munich Airport, Germany| iPort campaign | +
-| 03/2011 - 07/11/2011 | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE |+
  
  
 ===== Specifications ===== ===== Specifications =====
-^ Parameter  ^ Specification  ^ Remark  ^ +^ Parameter  ^ Specification ^ 
-| Frequency | 35.5 ± 0.15 GHz  | corresponds to wavelength of 8.5 mm | +| Wavelengths | Silicon broadband pyranometer, 415, 500, 615, 673, 870, 940 nm | 
-| Peak power (max) | 25 kW  |  | +| FWHM bandwidth | 10 nm | 
-| Average power | ~ 24 W |  | +| Cosine response | Better than 5% for 0 - 80° zenith angle; better than 1% with corrections  | 
-| Pulse width | 200 ns | adjustable (100, 200, or 400 ns)  | +| Temporal Resolution | 15 s | 
-| Pulse repetition frequency | 5 kHz | adjustable (5-10 kHz) | +| Weight | 4.55 kg | 
-| Minimum height | 150 m | full sensitivity above 400 m  | +| Power Consumption | 110/220 VAC, 50/60 Hz (50 watts maximum) | 
-| Measuring range | 15 km | adjustable (7.5-30 km)  | +| Manufacturer | [[http://www.yesinc.com/|YES Inc.]] 
-| Range resolution | 30 m | adjustable (15, 30, or 60 m) | + 
-| 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 | ±0.5 dB |  | +
-| Number of gates (with simultaneous stored raw data) | 500 |  | +
-| Number of averaging spectra | 200 | adjustable (1-32768) | +
-| Manufacturer | [[http://www.metek.de/|Metek]] |  |+
instruments/mfrsr/mfrsr.txt · Last modified: 2021/01/22 22:17 by 127.0.0.1