Rain masking gauge response times john goddard and thanks to elizabeth slack for help with data
This presentation is the property of its rightful owner.
Sponsored Links
1 / 11

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


  • 45 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


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

Chilbolton Facility for Atmospheric and Radio Research

500 metre Range at Chilbolton

Cluster of gauges


Rain masking gauge response times john goddard and thanks to elizabeth slack for help with data

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.


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

Distrometer

Rain Sensor

Drop Counting

Gauge

Syphon Gauge

Optical Gauge

Tipping Bucket Gauge


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

2 July 2002

16.38Spurious (?) drop on DC8

16.41Impact distrometer

16.41Optical gauge records rain

16.49DC6 records first drop

16.57Rain Sensor

17.00Tipping bucket (1020 mins.)


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

2 July 2002

08.10Optical gauge and distrometer only

08.30Start of event recorded by most instruments


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

4 July 2002

22.35Small event on optical gauge

and impact distrometer

22.45Optical gauge and impact distrometer record stronger rain

22.55DC8 records first drop

23.01DC6 records first drop

23.20Tipping bucket (~1400 mins.)


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

8 July 2002 (1)

06.25Spurious count on Rain Sensor

06.44 Optical gauge records rain

06.48DC6 and DC8 record first drops

07.47Tipping bucket (~468 mins.)


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

8 July 2002 (2)

13.15Optical gauge records rain (795 min.)

13.18DC6 and DC8 record first drops

13.19Rain Sensor records drop

13.19Tipping bucket (~799 mins.)


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

8 July 2002 (3)

15.40Optical gauge records rain (940 min.)

15.54DC8 record first drops

15.55DC 6 records first drops

15.57Rain Sensor records drop

15.58Tipping bucket (~958 mins.)


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

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


  • Login