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

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Presentation on theme: "KERGUELEN ISLANDS Photo: Antoine Guillot (Nivmer 2000) ROSAME Geoditic fixing: state and prospects L. Testut, C. Le Provost and P. Téchiné."— Presentation transcript:

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

3 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 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

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

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

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

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

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

9 Calibration of the Pressure Gauge (Kerguelen) -> T(°C)=a+bR+cR 2 +dR 3 ABCD - > Pressure=A T +B T R+C T R 2 +D T R 3 04/9301/200102/98 [A’, B’, C’, D’] [A, B, C, D] Constructor Calibration

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

11 Saint-Paul (77°32 E - 38°42 S) TG

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

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

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15 ?

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

17 CONCLUSION Difficult task to maintain a TG network in such hostile conditions Technical Logistic Financial

18 PERSPECTIVES CGPS@KERGUELEN Initiate a levelling program Rebuilt Crozet TG CGPS@CROZET

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