1. Recent GNSS activities in Germany for COST and E-GVAP
G. Dick1
X. Li1 , F. Zus1, J. Wickert1 R. Potthast2, M. Bender2, S. Crewell3, S. Steinke3
1GFZ Potsdam
2German Weather Service DWD
3University Cologne
COST GNSS4SWEC MC and E-GVAP Meetings
October 1, 2015
Wroclaw, Poland
COLAGE invited talk: When: April 2 (Friday) at Conference (Atibaia city): Subject:
General information of CHAMP mission,
Application of GPS occultation data to retrieve TEC, Temperature profile and water vapor, and
CHAMP data bank.
Audience: South America's Space geophysics community and Graduate students.

2. Overview GNSS Processing at GFZ
NRT:
(1) EPOS6 software, E-GVAP operational
(2) EPOS8, GPS only, pre-operational
(3) EPOS8, Multi-GNSS, MGEX operational + TROPO tests
(4) EPOS8, COST Benchmark campaign
Real-Time:
(5) EPOS-RT, GPS only, pre-operational
(6) EPOS-RT, Multi-GNSS, simulated RT test processing

3. Operational Processing at GFZ
E-GVAP official GFZ product, GFZ EPOS6 Software, GPS only
PPP strategy, GFZ orbits/clocks as input, CPU of ~10 min
~300 stations in processing (SAPOS+EUREF)
ZTD/IWV with 15 min. time resolution
STD with 2.5 min., delivered to DWD for testing of STD operator
ZTD/IWV/STD
in NRT D

4. Pre-operational NRT Processing
EPOS8 software (updated models), PPP strategy
ZTD/IWV/STD products, GPS only, GLONASS will be included
~400 stations in processing (SAPOS + EUREF+ global IGS stations)
pre-operational test run since January 2014
goal: uploading to E-GVAP
STDs delivered to DWD for testing of STD operator D

5. Real-time Processing ZTD products, GPS only (GLO+GAL+BeiDou testing)
15 Bavarian SAPOS stations in processing since August 2014
30 EPN/IGS sites included for COST RT demonstration campaign since April 2015
Goal: COST2.2 format and delivery to GOP
Example: real time ZTDs for BRST 17 – 20 Sep, 2015)

6. COST Benchmark Processing
EPOS8 software, PPP strategy
GPS only, GLONASS will be included
~550 stations in processing (Benchmark + global IGS stations)
post-processing (daily) / simulated NRT mode (12h sliding window)
ZTD/IWV/STD/gradients products
slants with and without residuals D

7. GFS NWM horizontal gradients for Benchmark stations (May 20, 2013)77
NWM-derived tropospheric parameters
GFS NWM horizontal gradients for Benchmark stations (May 20, 2013)

8. Cooperation with German Weather Service DWD

9. Development of STD operator
Focus: Development of a STD forward operator for improving humidity information of the models
Strategy: Assimilation of STD
Operator has interfaces to all DWD models (GME/ICON, COSMO-DE) and works with the corresponding assimilation systems (LETKF and 3d-Var)
Current status: Operator developed
Investigation of observation-minus-background statistics (first results available)
Goal: Operational STD assimilation

10. Validation of Slant Operator with COSMO-DE
Statistical example for March 2015 with STDs from EPOS8

11. Cooperation with University Cologne

12. Use of GPS-derived IWV
for assessing small scale water vapour variability
multi-instrument effort at Jülich ObservatorY for Cloud Evolution (JOYCE)
High Definition Clouds and Precipitation for Climate Prediction (HD(CP)²)
HD(CP)² Observation Period Experiment (HOPE) April and Mai 2013
Steinke et al., Atmospheric Physics and Chemistry

13. Evaluation of diurnal cycle of IWV in COSMO-REA
Mean diurnal cycle of IWV measured with GPS and simulated with COSMO-REA during spring and summer at 25 GPS stations

14. Thank you very much!