Rosame geoditic fixing state and prospects
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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 l.jpg

ROSAMEGeoditic fixing: state and prospects

L. Testut, C. Le Provost and P. Téchiné

KERGUELEN ISLANDS Photo: Antoine Guillot (Nivmer 2000)


R seau d o bservation s ub antarctique et a ntarctique du niveau de la me r l.jpg
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


Georeferencing of rosame tg l.jpg

DUMONT D’URVILLE

CROZET

SAINT-PAUL

KERGUELEN

Georeferencing of ROSAME TG

- G. Woppelman and C. Le Provost. NIVMER 1994


Kerguelen 70 13 e 49 20 s l.jpg
Kerguelen (70°13 E – 49°20 S)

TG: Pressure Gauge

Type:WLR7 Aanderaa

Inst. date: 1993

Time sampling: 1h

Transmission: Argos


Gps equipment l.jpg
GPS equipment

Tide Gauge

-GPS IGS site (cnes)

-DORIS (cnes)

-GPS Pillar (1994)

-Network of TGBMs

GPS

DORIS


Prospect l.jpg
Prospect

-Install a GPS

-Initiate a levelling program (IGN)

- Monitoring the instrumental reference

GPS pillar

Tide gauge

TGBM

Instrumental reference


Calibration of the pressure gauge kerguelen l.jpg
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


Calibration of the pressure gauge kerguelen8 l.jpg
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


Saint paul 77 32 e 38 42 s l.jpg
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


Saint paul 77 32 e 38 42 s10 l.jpg
Saint-Paul (77°32 E - 38°42 S)

TG


Crozet 51 52 e 46 25 s l.jpg
Crozet (51°52 E – 46°25 S)

TG: Pressure Gauge

Type:MORS

Inst. date: 1995

Time sampling:1h

System: Argos


Crozet 51 52 e 46 25 s12 l.jpg
Crozet (51°52 E – 46°25 S)

  • - No power supply

  • Difficult access

  • Oceanic vandalism


Slide14 l.jpg

?


Dumont d urville 140 e 66 39 s l.jpg
Dumont d’Urville (140° E - 66°39 S)

GPS

DORIS

TG: Pressure Gauge

Type:MORS

Inst. date: 1997

Time sampling:30min/1h

System: Argos


Conclusion l.jpg
CONCLUSION

Difficult task to maintain a TG network in such hostile conditions

  • Technical

  • Logistic

  • Financial


Perspectives l.jpg
PERSPECTIVES

  • CGPS@KERGUELEN

  • Initiate a levelling program

  • Rebuilt Crozet TG

  • CGPS@CROZET