Precipita)on measurements at Rothera research sta)on in Antarc)ca. Steve Colwell Bri)sh Antarc)c Survey
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1 Precipita)on measurements at Rothera research sta)on in Antarc)ca Steve Colwell Bri)sh Antarc)c Survey
2 Background Solid precipita)on is very hard to measure in Antarc)ca. The World Meteorological Organisa)on (WMO) is currently running a project called the Solid Precipita)on Intercomparison Experiment (SPICE). SPICE is trying to evaluate the best way to make electronic measurements of solid precipita)on. The WMO are using a double fence reference gauge BAS is trialling several precipita)on measuring devices at Rothera sta)on but does not have space for the reference gauge.
3
4
5 Biral VPF 730 combined precipita)on and visibility sensor
6 Mode of Operation of the VPF 730 The sensor uses an 850nm infrared light source that is then detected using a forward scatter receiver and also a backscatter receiver. The forward scatter is used to calculate visibility. The backscatter receiver gives the sensor the ability to discriminate between liquid and frozen precipitation, liquid precipitation scatters very little of the transmitted light towards the backscatter receiver, whilst frozen precipitation scatters a significant amount in this direction. Transmitter forward scatter receiver backscatter receiver
7 Thies Laser Precipita)on Monitor
8 Mode of Operation of the Laser Precipitation Monitor A laser-optical beaming source of wavelength 780nm produces a parallel light-beam. A photo diode with a lens is situated on the receiver side in order to measure the optical intensity by transforming it into an electrical signal. 20mm Infrared light beam 228 mm Particle 0.75mm When a precipitation particle falls through the light beam the receiving signal is reduced and the diameter of the particle is calculated from the amplitude of the reduction. The fall speed of the particle is determined from the duration of the reduced signal. The measured values are processed by a signal processor, and checked for plausibility (e.g. edge hits). Calculation comprises the intensity, quantity, and type of precipitation (drizzle, rain, snow, soft hail, hail as well as mixed precipitation)
9 PWS10present weather sensor
10 PWS10general arrangement
11 Delayed refrac)on to horizontal sensor The sensor comprises one laser head and two sensor heads. Each of the sensor heads is 20 off axis to the laser unit axis, one in the horizontal plane, the other in the vertical plane When a particle enters the beam it is first detected by the off axis receiver in the vertical plane and then a short time later by the second receiver in the horizontal plane. This allows the size and fall speed to be calculated.
12 Environmental Measurements Ltd Universal Precipita)on Gauge (UPG1000)
13 Universal Precipita)on Gauge Ini)ally the gauge was located up by the meteorological tower. The a wind shield was installed round the gauge a year later. Finally the gauge and wind shield were relocated behind one of the buildings to give some extra wind shielding. Each of the changes increased the amount of precipita)on that was captured.
14 120. Rothera snowgauge March Snowgauge LPM PWS VPF
15 6 Weather March 24th Hours Temperature Wind Speed (knots)
16 6 March 24th P rec i p it a ti 3 o n( m ) Time in minutes LPM PWS10 Heated snowgauge VPF 73
17 0.4 March 24th R at e Time in minutes LPM PWS 10 VPF 73 Heated snowgage
18 14. Rothera snowgauge May Snowgauge LPM PWS VPF
19 Weather May 20th Hours Temperature Wind Speed (knots)
20 n ( m 6 May 20th 2015 P r e c i p i t a5 t o i m ) Time in minutes LPM PWS 10 Heated snowgauge VPF 73
21 0.08 May 20th R at e Time in minutes LPM PWS10 VPF 73 Heated snowgauge
22 0.08 May 20th R at e Time in minutes LPM PWS10 VPF 73 Wind speed (knots)
23 0.08 May 20th R at e Time in minutes LPM PWS10 VPF 73 Wind direc)on
24 0.08 May 20th R at e Time in minutes 5 LPM PWS10 VPF 73 LPM precip PWS 10precip
25 Conclusions For rain there is good agreement between all of the sensors. During solid precipita)on events both the LPM and VPF 73can at )mes over read. Most of the )me there is disagreement between all of the sensor and as there is no ground truth it is impossible to say which is the most accurate. The data needs to be examined in more detail to try and iden)fy why there is a discrepancy in the readings.
26 2 Thies LPMs on the meteorological tower at Halley. One at 5m and the other at 10m to look at the affect of blowing snow
27 Ques)ons
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