Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate (GNSS4SWEC)

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1 Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate (C) Y1 Y1 Y1 G. Guerova (1), J. Jones (2), J. Dousa (3), G. Dick (4), S. de Haan (5), E. Pottiaux (6), O. Bock (7), R. Pacione (8), G. Elgered (9), H. Vedel (10) (1) Sofia University, Bulgaria, (2) Met Office, UK, (3) Geodetic Observatory Pecny, Czech Republic, (4) GFZ, Germany, (5) KNMI, Netherlands, (6) Royal Observatory of Belgium, Belgium, (7) IGN, France, (8) E-geos s.p.a ASICGS, Italy, (9) Chalmers Univ. of Technology, Sweden, (10) DMI, Denmark IGS Workshop 2014, 23-27/06/2014 Pasadena, CA, USA

2 GNSS Meteorology in 1996-present Y1 Y1 Y1 source: J. Jones, COST DC hearing, Brussels, September 2012

3 State of the art: GNSS Meteorology Y1 Y1 Y1 GNSS tropospheric products GNSS Meteorology processing is essentially GPS processing only tropospheric gradients and/or slant delays produced; not used in NWP network solution eliminating GNSS receiver and satellite clock errors in double difference GNSS tropospheric product coverage - very good in West ; poor in East and Southeast NWP data used in Vienna Mapping Function concept GNSS and weather forecasting (E-GVAP-NOAA) 18 national Met-offices and 17 AC members of E-GVAP; GNSS data assimilated in NWP models in UK, Netherlands, France, ECMWF over 1800 ground-based GNSS stations in, over 2000 and USA GNSS tropospheric products mainly ZTDs with hourly update impact on very short range forecasting (nowcasting) of precipitation/thunderstorms GNSS and climate IGS and EUREF repro 1 tropospheric products available and repro 2 in the pipeline validation of NCEP model - good seasonal and inter-annual variations of IWV NCEP model - IWV underestimation with 40 % in tropics and 25 % in Antarctica linear IWV trends Global scale trend: -1.6 to +2.3 kg/(m 2.decade) trend uncertainty: 0.2 to +1.5 kg/(m 2.decade)

4 COST Action C Y1 Y1 Y1 Action chair Dr. Jonathan Jones, UK Metoffice (jonathan.jones@metoffice.gov.uk) Action vice-chair Dr. Guergana Guerova, Uni Sofia (guerova@phys.uni-sofia.bg) 29 COST Countries 100+ Participants from 60+ institutes 6 NCIs (UoNB, IGS, UoA, GeoAus, RMIT, UoHK) 1 COST NNC (OTC Tunisia) Dark+Light Blue: Countries participating in the Action Dark Blue: Countries involved Management Team source:

5 Working Group 1: Advanced Processing Techniques chair Dr. Jan Dousa, Geodetic Observatory Pecny co-chair Dr. Galina Dick, GFZ Support establishment of new GNSS ACs in Eastern Y1 Develop new multi-gnss processing algorithms (GLONASS + Galileo ready) Y1 Develop new GNSS tropospheric products (RT slants, gradients etc) Y1 NWP model data to improve real-time GNSS processing New oper. product 1st Workshop (State-of-the-art review) Kick-off Meeting 2nd Workshop (Ultra-fast/real-time Processing and Multi- GNSS Products) 3rd Workshop (Processing Techniques and New Product Assessment) Final Workshop YEAR 1 YEAR 2 YEAR 3 YEAR 4 Green = Guidelines/reviews, Blue = Developments, Purple = Databases

6 WG 1: Advanced Processing Techniques Y1 Y1 4 AC implemented Ultra Rapid/Real Time processing strategies 3 AC implemented first level multi GNSS processing (GPS+GLONASS) 7 new AC from 7 EU countries established added over 130+ new stations to the operational an GNSS network strong correlation between GNSS and NWP Y1

7 Y1 Y1 Y1 Working Group 2: GNSS for high resolution NWP and sever weather forecasting chair Dr. Siebren de Haan, KNMI co-chair Dr. Eric Pottiaux, ROB DB - NWP for positioning DB - Sev. Weather Events User requirements Quality of multi GNSS-processing algorithms Evaluate new GNSS tropospheric products (gradients, slants etc) Develop and test methods for init. of NWP models with the new products Set up databank (obs.+products) for S.W. case studies Impact of new GNSS tropo products for severe weather events Operational tools for severe weather forecasting Q.C. of new operational GNSS tropo products Recommendations 2nd Workshop (Strengths and Weakness of NWP models w.r.t. GNSS) Kick-off Meeting 1st Workshop (State-of-the-art review) 3rd Workshop (GNSS nowcasting - Tools and Practices) Final Workshop YEAR 1 YEAR 2 YEAR 3 YEAR 4 Green = Guidelines/reviews, Blue = Developments, Purple = Databases

8 WG 2: GNSS for NWP and sever weather Y1 Y1 inventory of GNSS tools for nowcasting and user requirements review of current meteo requirements for GNSS-based and tomography products benchmark period for testing the new GNSS products severe weather database established at UKMO case studies during intense precipitation events Y1

9 Working Group 3: GNSS for climate monitoring Y1 Y1 Y1 chair Dr. Olivier Bock, IGN co-chair Dr. Rosa Pacione, ASI Define user requirements Standardize method for ZTD to IWV conversion Establish database of reprocessed GNSS tropospheric products Detect and mitigate Dev., discontinuities eval., and standardize in the ZTD to and IWV IWV conversion time series Develop diagnostic tools for quantifying climate trends and variability Reprocesed GNSS trop. products for NWP reanalysis / climate models Issue Guidelines 1st Workshop (State-of-the-art review) Final Workshop Kick-off Meeting 2nd Workshop (Assessment of reprocessed GNSS tropospheric products) 3rd Workshop (Climate trends and variability of water vapour on regional and global scales) YEAR 1 YEAR 2 YEAR 3 YEAR 4 Green = Guidelines/reviews, Blue = Developments, Purple = Databases

10 WG 3: GNSS for climate monitoring Y1 Y1 inventory reprocessed GNSS products review of ZTD to IWV conversion global database for GNSS+RS comparison with climate data (GOP) first studies with climate models ongoing GNSS data homogenisation with the TIGA data-set (GFZ) Y1

11 coming: GNSS Y1 Y1 Y1 First COST Workshop February, Munich, Germany & International Symposium on Data Assimilation First COST Summer school and Working Group meeting September 2014, Bulgaria Second C workshop, May 2015, Greece

12 GNSS Y1 Y1 Y1 Thank you!