GPS PWV Estimation and Support to UNSTABLE GPS PWV Estimation and Support to UNSTABLE S. Skone Dept. of Geomatics Engineering University of Calgary

2 GPS PWV GPS Observables Range Observation P =  +d  +c(dt s -dt r )+ion+SD+  p  = geometric range d  = orbital errors dt s = satellite clock error dt r = receiver clock error ion = ionosphere range delay SD = neutral atmosphere range delay  = noise and multipath

3 GPS PWV PWV Estimation SWD = M(E)  ZWD PWV =   ZWD PWV derived with mm-level accuracy PWV

4 GPS PWV U of C Network Continuous 30-s data since 2003 Processed to derive 30-minute PWV estimates at each site

5 GPS PWV Focus Surveys operates network of GPS reference stations in Alberta Network used to derive corrections for precise surveys conducted by Focus Agreement in place Fall 2006 to share sites and infrastructure Focus to maintain and support real-time data streaming from four sites: Olds, Cochrane, Strathmore and Vulcan Data (GPS and met) sent to ftp server at University of Calgary Collaboration with Focus

6 GPS PWV Anticipate approximately three-four spare GPS receivers available for deployment at temporary sites in 2008 (Limestone mountain, Alford Lake, others?) May need to be augmented with met sensors Will continue to operate GPS sites in Sundre and Cremona (foothills) Radiometrics MP-1500 microwave profiler available for temporary deployment (water vapour profiler) Radiometrics WVR-1100 water vapour radiometer available for temporary deployment (PWV and liquid water) Both profiler and radiometer equipped with “super-blower” rain effect mitigation U of C Infrastructure

7 GPS PWV Equipment Radiometer MET3A GPS antenna

8 GPS PWV Equipment

9 GPS PWV 25 km GPS receiver PWV Resolution

10 GPS PWV Radar GPS 1000 LT

11 GPS PWV 1100 LT Radar GPS

12 GPS PWV 1200 LT Radar GPS

13 GPS PWV 1300 LT Radar GPS

14 GPS PWV 1400 LT Radar GPS

15 GPS PWV 1500 LT Radar GPS

16 GPS PWV 1600 LT Radar GPS

17 GPS PWV 1700 LT Radar GPS

18 GPS PWV 1800 LT Radar GPS

19 GPS PWV 1900 LT Radar GPS

20 GPS PWV 2000 LT Radar GPS

21 GPS PWV 2100 LT Radar GPS

22 GPS PWV Sundre Site Analysis Indices derived based on rate of change of PWV and mixing ratio Some correlation of index with storm development for Sundre site After applying absolute PWV threshold, prediction of thunderstorm development possible

23 GPS PWV Processing Requirements Post-processing conducted using commercial software (Bernese version 5.0) UofC capabilities to set up automated processing of large data sets (network adjustment augmented with national GPS reference sites) Complex iterative process which requires training UofC graduate student expertise available for data processing and analysis Anticipate two months of student time at $2,000 per month