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Rain Masking (Gauge Response Times) John Goddard and thanks to Elizabeth Slack for help with data

R. R. A. F. C. Chilbolton Facility for Atmospheric and Radio Research. Rain Masking (Gauge Response Times) John Goddard and thanks to Elizabeth Slack for help with data. Ground located gauges. Optical Rain Gauge. Equipment mounted on portakabin roof. R. R. A. F. C.

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Rain Masking (Gauge Response Times) John Goddard and thanks to Elizabeth Slack for help with data

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  1. R R A F C Chilbolton Facility for Atmospheric and Radio Research Rain Masking (Gauge Response Times) John Goddard and thanks to Elizabeth Slack for help with data

  2. Ground located gauges Optical Rain Gauge Equipment mounted on portakabin roof. R R A F C Chilbolton Facility for Atmospheric and Radio Research 500 metre Range at Chilbolton Cluster of gauges

  3. Device Manufacturer Technique Collector Area Range/ Calibration RAL RRDC[1] Gauge (on roof) RCRU (MKIV) Volumetric Drop 150cm² 5-200mm/hr, 0.004mm/drop Optical Rain Gauge Sci Tech Inc. (ORG700) Optical Extinction 300cm² 0.1-3000mm/hr Impact Distrometer Distromet Ltd (RD-69) Impact Momentum 50cm² 0.3mm-5mm (drop diameter) Rain Sensor R&D Instrumet (SN-R) Volumetric Drop 50cm² 0.01mm/drop Tipping Bucket Gauge RWMunro (R100) Bucket Volume 324cm² (8"diam) 0.2mm/bucket Self-Syphoning Capacitance Gauge RMYoung (50202) Water Level ~ Capacitance 100cm² 50mm/Syphon RAL RRDC Gauge (on ground) RCRU (MKIV) Volumetric Drop 150cm² 5-200mm/hr, 0.004mm/drop RAL RRDC Gauge (on ground) RCRU (MKIV) Volumetric Drop 324cm² (8"diam) 3-100mm/hr, 0.002mm/drop R R A F C Chilbolton Facility for Atmospheric and Radio Research Rain Sensors deployed at Chilbolton [1] Abbreviation RAL RRDC Gauge = Rutherford Appleton Laboratory Rapid Response Drop Counting Rain Gauge.

  4. R R A F C Chilbolton Facility for Atmospheric and Radio Research Distrometer Rain Sensor Drop Counting Gauge Syphon Gauge Optical Gauge Tipping Bucket Gauge

  5. R R A F C Chilbolton Facility for Atmospheric and Radio Research 2 July 2002 16.38 Spurious (?) drop on DC8 16.41 Impact distrometer 16.41 Optical gauge records rain 16.49 DC6 records first drop 16.57 Rain Sensor 17.00 Tipping bucket (1020 mins.)

  6. R R A F C Chilbolton Facility for Atmospheric and Radio Research 2 July 2002 08.10 Optical gauge and distrometer only 08.30 Start of event recorded by most instruments

  7. R R A F C Chilbolton Facility for Atmospheric and Radio Research 4 July 2002 22.35 Small event on optical gauge and impact distrometer 22.45 Optical gauge and impact distrometer record stronger rain 22.55 DC8 records first drop 23.01 DC6 records first drop 23.20 Tipping bucket (~1400 mins.)

  8. R R A F C Chilbolton Facility for Atmospheric and Radio Research 8 July 2002 (1) 06.25 Spurious count on Rain Sensor 06.44 Optical gauge records rain 06.48 DC6 and DC8 record first drops 07.47 Tipping bucket (~468 mins.)

  9. R R A F C Chilbolton Facility for Atmospheric and Radio Research 8 July 2002 (2) 13.15 Optical gauge records rain (795 min.) 13.18 DC6 and DC8 record first drops 13.19 Rain Sensor records drop 13.19 Tipping bucket (~799 mins.)

  10. R R A F C Chilbolton Facility for Atmospheric and Radio Research 8 July 2002 (3) 15.40 Optical gauge records rain (940 min.) 15.54 DC8 record first drops 15.55 DC 6 records first drops 15.57 Rain Sensor records drop 15.58 Tipping bucket (~958 mins.)

  11. R R A F C Chilbolton Facility for Atmospheric and Radio Research Conclusions Distrometer and Optical gauge - both good indicators of precipitation onset Drop counting gauges lag these by 2-5 minutes (maybe depending on how wet the collector has remained since the last event) Tipping bucket gauge - not useful for this purpose - lags of tens of minutes in weak precipitation - 2 factors, collector wetting and bucket capacity

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