The GRUAN Observing Station Payerne - Switzerland
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1 WMO/IOC/UNEP/ICSU GLOBAL CLIMATE OBSERVING SYSTEM (GCOS) 4rd GRUAN Implementation- Coordination Meeting (ICM-4) Tokyo, Japan 5 March 9 March 2012 Doc. 5.4 (29.II.2012) Session 5 The GRUAN Observing Station Payerne - Switzerland (Submitted by, Gilbert Levrat, Gonzague Romanens, Pierre Jeannet, Emmanuel Brocard, Andreas Kräuchi) Summary and Purpose of Document This document contains GRUAN Activities in 2011and a presentation of the Swiss digital radiosonde SRS-C34.
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3 Federal Department of Home Affairs FDHA The GRUAN Observing Station Payerne - Switzerland, Gilbert Levrat, Gonzague Romanens, Pierre Jeannet, Emmanuel Brocard, Andreas Kräuchi
4 GRUAN activities New digital radiosonde SRS-C34 since January 2011 GRUAN - reference and test soundings since May 2011 Humidity intercomparison SRS-C34, RS92, SnowWhite Temperature intercomparison and radiation error Temperature intercomparison SRS-C34, RS92 Temperature uncertainty triple sounding SRS-C34
5 Swiss digital Radiosonde SRS-C34 Operational 2011 daily UT 00/12 Swiss digital radiosonde SRS-C34 developed by MeteoLabor using GPS for pressure and wind Temperature: Thermocouple Humidity: ROTRONIC HC2 capacitive sensor Altitude/Pressure: GPS Wind Speed/Dir.: GPS
6 Swiss digital Radiosonde SRS-C34 Temperature - Humidity - Pressure sensors Rotronic HC2 capacitive sensor GPS Thermocouple (Copper - Constantan) (wire ø 0.05 mm) Water Hypsometer Transmitter 400 Mhz Electronique Interface Telemetry
7 Swiss digital Radiosonde SRS-C34 ARGUS 37 control system for SRS-C34 GPS PTU Data + GPS 31 satellites orbiting at km
8 Swiss digital Radiosonde SRS-C34 Versatility of SRS-C34 SRS-C34 + Ozone sonde Oxidation of potassium iodide by ozone in an aqueous solution SRS-C34 + SnowWhite (dew/frost point hygrometer) Detection of dew or frost on gold mirror by diode light beam SRS-C34 + FLASH (Fluorescent Advanced Stratospheric Hygrometer) Photodissociation of H 2 O molecules with Lyman Alpha light source and detection of the fluorescence of excited OH radicals SRS-C34 + COBALD (backscatter sonde) Light flash from Xenon lamp at 490 and 940 nm and measurement of backscattered light from ice crystals or aerosols SRS-C34 + CNR4 Net Radiometer Shortwave and longwave upward and downward
9 GRUAN - reference multi-soundings since May 2011 Biweekly daytime UT 12:00 (Tuesday or Thursday) Double sounding: - Meteolabor SRS-C34 - Vaisala RS92 (DigiCORA MW31) submitted to GRUAN lead center Biweekly nighttime UT 00:00 (Wednesday or Friday) Triple sounding: - Meteolabor SRS-C34 - Vaisala RS92 (DigiCORA MW31) submitted to GRUAN lead center - Meteolabor SnowWhite dew/frost point hygrometer
10 Humidity intercomparison SnowWhite, SRS-C34, RS92 (nighttime)
11 Humidity intercomparison SnowWhite, RS92 (nighttime)
12 Temperature intercomparison SRS-C34 during CHINA intercomparison (nighttime)
13 Temperature intercomparison SRS-C34 during CHINA intercomparison (daytime)
14 Radiation Error on SRS-C34 Temperature sensor
15 Method to shade and unshade Temperature sensor - Aluminium plate (brilliant / black) attached to SRS-C34 - Temperature sensors on both sides (5cm distance) - Alternately one sensor is exposed to the sun Reference sensor
16 Method to shade and unshade Temperature sensor - Aluminium plate (brilliant / black) attached to SRS-C34 - Temperature sensors on both sides (5cm distance) - Alternately one sensor is exposed to the sun Reference sensor
17 Radiation Error on Temperature SRS-C34 Radiosonde
18 Radiation Error on Temperature SRS-C34 Radiosonde
19 Old - Radiation Error Correction SRS-C34 Radiosonde
20 New - Radiation Error Correction SRS-C34 Radiosonde
21 Temperature uncertainty Triple sounding SRS-C34 Night flight ( ± 0.1 K ) Day flight ( ± 0.2 K )
22 Summary GRUAN reference multi-sounding biweekly with SRS-C34, RS92 and SnowWhite Humidity comparisons between SRS-C34, RS92 and SnowWhite Investigations on radiation error on temperature measurements Temperature uncertainty with triple sounding SRS-C34
The GRUAN Observing Station Payerne - Switzerland
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