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GOCE/GRACE GGM evaluation over Greece with GPS/Leveling and gravity data G.S. Vergos, V.D. Grigoriadis, I.N. Tziavos, D.A. Natsiopoulos, E.A. Tzanou.

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Presentation on theme: "GOCE/GRACE GGM evaluation over Greece with GPS/Leveling and gravity data G.S. Vergos, V.D. Grigoriadis, I.N. Tziavos, D.A. Natsiopoulos, E.A. Tzanou."— Presentation transcript:

1 GOCE/GRACE GGM evaluation over Greece with GPS/Leveling and gravity data G.S. Vergos, V.D. Grigoriadis, I.N. Tziavos, D.A. Natsiopoulos, E.A. Tzanou

2 Availability of several GOCE/GRACE GGMs for the Earth’s potential OUTLINE

3 o TIM (R1, R2, R3, R4, R5) o DIR (R1, R2, R3, R4, R5) o GOCO (01s, 02s, 03s) o EIGEN*s/c (51c, 6s/c, 6s/c2, 6c3stat) o ITG-GOCE02s, GOGRA02s/04s, JYY_GOCE02s/04s OUTLINE

4 Availability of several GOCE/GRACE GGMs for the Earth’s potential o TIM (R1, R2, R3, R4, R5) o DIR (R1, R2, R3, R4, R5) o GOCO (01s, 02s, 03s) o EIGEN*s/c (51c, 6s/c, 6s/c2, 6c3stat) o ITG-GOCE02s, GOGRA02s/04s, JYY_GOCE02s/04s Validation of the GOCE/GRACE GGMs and Wo determination OUTLINE

5 OUTLINE Availability of several GOCE/GRACE GGMs for the Earth’s potential o TIM (R1, R2, R3, R4, R5) o DIR (R1, R2, R3, R4, R5) o GOCO (01s, 02s, 03s) o EIGEN*s/c (51c, 6s/c, 6s/c2, 6c3stat) o ITG-GOCE02s, GOGRA02s/04s, JYY_GOCE02s/04s Validation of the GOCE/GRACE GGMs and Wo determination o External validation over Greece with collocated GPS/Leveling BMs and gravity anomaly data

6 METHODOLOGY Combined GGM differences to n max =216,000 evaluation of GOCE/GRACE GGMs every 1 degree from a 3  DTM over Greece

7 METHODOLOGY Combined GGM differences to n max =216,000 evaluation of GOCE/GRACE GGMs every 1 degree from a 3  DTM over Greece o Mean Tide to Tide Free conversion for orthometric heights o GGM Zero Tide to Tide Free when necessary o All computations in GRS80 o N o relative to the IERS W o of 62636856.0 m 2 /s 2

8 METHODOLOGY Combined GGM differences to n max =216,000 evaluation of GOCE/GRACE GGMs every 1 degree from a 3  DTM over Greece o Free-air gravity anomalies o GRS80/IGSN71 o Clean database after LSC-based blunder detection and removal

9 LOCAL DATA 1542 collocated GPS/Leveling observations

10 LOCAL DATA 294777 free-air gravity anomalies

11 GOCE GGM VALIDATION

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15 GGMd/orangemeanstd EGM2008 21900.954-0.416±0.139 DIR-R5 169+EGM080.885-0.384±0.123 TIM-R5 166+EGM080.890-0.389±0.121 GOCO03s 167+EGM080.922-0.389±0.122 ITG-GOCE02s 166+EGM080.901-0.383±0.122 GOGRA04s 167+EGM080.889-0.389±0.122 JYY-GOCE04s 167+EGM080.887-0.382±0.122 Geoid height differences between GOCE/GRACE GGMs and GPS/Lev BMs. Unit [m]

16 GOCE GGM VALIDATION TIM-R5, DIR-R5 and EGM2008 Geoid height differences at the GPS/Lev BMs

17 GOCE GGM VALIDATION

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21 GGMEGM2008TIM-R5DIR-R5N grav 0-10 km12.1811.61 10.38 10-20 km7.156.836.846.49 20-30 km4.824.614.624.36 30-40 km3.753.573.593.30 40-50 km3.062.882.892.70 50-60 km2.582.392.422.26 60-70 km2.252.062.081.97 70-80 km2.001.801.831.76 80-90 km1.791.591.621.58 90-100 km1.611.411.43 >100 km0.690.610.630.64 Relative accuracy of geoid height differences. Unit [ppm]

22 GOCE GGM VALIDATION

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27 GGMd/orangemeanstd EGM2008 2190184.100.57±5.32 DIR-R5 214+EGM08179.060.39±4.89 TIM-R5 212+EGM08179.160.45±4.89 GOCO03s 193+EGM08177.380.45±4.89 ITG-GOCE02s 193+EGM08177.850.54±4.89 GOGRA04s 194+EGM08177.980.62±4.89 JYY-GOCE04s 194+EGM08178.160.64±4.89 Gravity anomaly differences between GOCE/GRACE GGMs and local data. Unit [mGal]

28 GOCE GGM VALIDATION TIM-R5, DIR-R5 and EGM2008 gravity anomaly differences with the local data

29 GOCE GGM VALIDATION Radially averaged PSD vs spatial frequency

30 Basic physical model (Helmert ortho heights): LS estimate of LVD’s zero-height level ‘weights’

31 Un-weighted LS estimate & combined GOCE/GRACE GGMs o EGM2008 (2190) o DIR-R5 (169)+EGM08 o TIM-R5 (166)+EGM08 o GOGRA04s (167)+EGM08

32 Un-weighted LS estimate & combined GOCE/GRACE GGMs o EGM2008 (2190) o DIR-R5 (169)+EGM08 o TIM-R5 (166)+EGM08 o GOGRA04s (167)+EGM08

33 Un-weighted LS estimate & combined GOCE/GRACE GGMs o DIR-R5 (169)+EGM08 o TIM-R5 (166)+EGM08 o GOGRA04s (167)+EGM08 Great consistency for the GOCE/GRACE GGMs in

34 o GOCE/GRACE GGM validation over Greece with GPS/Leveling and gravity data, with a remark on Wo determination CONCLUSIONS

35 o GOCE/GRACE GGM validation over Greece with GPS/Leveling and gravity data, with a remark on Wo determination o The latest releases are better than EGM2008 as much as 1.8 cm (1σ), reducing also the mean by 3 cm and the range by 7 cm CONCLUSIONS

36 o GOCE/GRACE GGM validation over Greece with GPS/Leveling and gravity data, with a remark on Wo determination o The latest releases are better than EGM2008 as much as 1.8 cm (1σ), reducing also the mean by 3 cm and the range by 7 cm o DIR-R5 and TIM-R5 are better up to d/o 230, with significant improvements in the spectral range between d/o 185-230 CONCLUSIONS

37 o GOCE/GRACE GGM validation over Greece with GPS/Leveling and gravity data, with a remark on Wo determination o The latest releases are better than EGM2008 as much as 1.8 cm (1σ), reducing also the mean by 3 cm and the range by 7 cm o DIR-R5 and TIM-R5 are better up to d/o 230, with significant improvements in the spectral range between d/o 185-230 o In terms of the gravity anomalies they are better than EGM2008 by 0.5 mGal (1σ), reducing also the mean by 0.2 mGal and the range by 7 mGal CONCLUSIONS

38 o GOCE/GRACE GGM validation over Greece with GPS/Leveling and gravity data, with a remark on Wo determination o The latest releases are better than EGM2008 as much as 1.8 cm (1σ), reducing also the mean by 3 cm and the range by 7 cm o DIR-R5 and TIM-R5 are better up to d/o 230, with significant improvements in the spectral range between d/o 185-230 o In terms of the gravity anomalies they are better than EGM2008 by 0.5 mGal (1σ), reducing also the mean by 0.2 mGal and the range by 7 mGal o from GOCE GGMs is very robust with between the various GGMs at 0.1-0.6 cm CONCLUSIONS

39

40 Funded by the European Space Agency (ESA) Scientific Experiment Development Program (PRODEX) within the General Secretariat for Research & Technology (GSRT) invitation to the Greek scientific community in response to the 1st PRODEX Programme Call for Greece. GOCESeaComb Project ACKNOWLEDGEMENT

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