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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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Presentation Transcript
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Chilbolton Facility for Atmospheric and Radio Research

Rain Masking

(Gauge Response Times)

John Goddard

and thanks to Elizabeth Slack for help with data

slide2

Ground located gauges

Optical Rain Gauge

Equipment mounted on portakabin roof.

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Chilbolton Facility for Atmospheric and Radio Research

500 metre Range at Chilbolton

Cluster of gauges

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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

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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.

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Chilbolton Facility for Atmospheric and Radio Research

Distrometer

Rain Sensor

Drop Counting

Gauge

Syphon Gauge

Optical Gauge

Tipping Bucket Gauge

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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.)

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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

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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.)

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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.)

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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.)

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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.)

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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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