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ROSAME Geoditic fixing: state and prospects

ROSAME Geoditic fixing: state and prospects. L. Testut, C. Le Provost and P. Téchiné. KERGUELEN ISLANDS Photo: Antoine Guillot (Nivmer 2000). R éseau d’ O bservation S ub-Antarctique et A ntarctique du niveau de la Me r. Antarctic and South Indian Ocean Tide Gauges Networks

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ROSAME Geoditic fixing: state and prospects

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  1. ROSAMEGeoditic fixing: state and prospects L. Testut, C. Le Provost and P. Téchiné KERGUELEN ISLANDS Photo: Antoine Guillot (Nivmer 2000)

  2. Réseau d’Observation Sub-Antarctique et Antarctique du niveau de la Mer • Antarctic and South Indian Ocean Tide Gauges Networks • Part of the French contribution to GLOSS • Part of global networks of monitoring southern ocean • 4 costal tides gauges • 2 moorings (Crozet - Amsterdam) • Monitoring Antarctic Circumpolar Current • Altimeter calibration • Monitoring the long term sea level

  3. DUMONT D’URVILLE CROZET SAINT-PAUL KERGUELEN Georeferencing of ROSAME TG - G. Woppelman and C. Le Provost. NIVMER 1994

  4. Kerguelen (70°13 E – 49°20 S) TG: Pressure Gauge Type:WLR7 Aanderaa Inst. date: 1993 Time sampling: 1h Transmission: Argos

  5. GPS equipment Tide Gauge -GPS IGS site (cnes) -DORIS (cnes) -GPS Pillar (1994) -Network of TGBMs GPS DORIS

  6. Prospect -Install a GPS -Initiate a levelling program (IGN) - Monitoring the instrumental reference GPS pillar Tide gauge TGBM Instrumental reference

  7. Calibration of the Pressure Gauge (Kerguelen) • Waves in the stilling well • Pressure transducer drift Drift ~0.2 cm/yr +1.3 ± 2 cm (0.97) new TG old TG Reference TG

  8. Calibration of the Pressure Gauge (Kerguelen) 04/93 02/98 01/2001 -> T(°C)=a+bR+cR2+dR3 [A’, B’, C’, D’] - > Pressure=AT+BTR+CTR2+DTR3 [A, B, C, D] Constructor Calibration

  9. Saint-Paul (77°32 E - 38°42 S) - No power supply - Nobody TG: Pressure Gauge Type:WLR7 Aanderaa Inst. date: 1994 Time sampling: 1h Transmission: Argos

  10. Saint-Paul (77°32 E - 38°42 S) TG

  11. Crozet (51°52 E – 46°25 S) TG: Pressure Gauge Type:MORS Inst. date: 1995 Time sampling:1h System: Argos

  12. Crozet (51°52 E – 46°25 S) • - No power supply • Difficult access • Oceanic vandalism

  13. ?

  14. Dumont d’Urville (140° E - 66°39 S) GPS DORIS TG: Pressure Gauge Type:MORS Inst. date: 1997 Time sampling:30min/1h System: Argos

  15. CONCLUSION Difficult task to maintain a TG network in such hostile conditions • Technical • Logistic • Financial

  16. PERSPECTIVES • CGPS@KERGUELEN • Initiate a levelling program • Rebuilt Crozet TG • CGPS@CROZET

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