TY  - STD
AU  - Belén Martín Míguez, Laurent Testut
PY  - 2012//
TI  - Performance of modern tide gauges: towards mm-level accuracyJF
T2  - Sci. Mar.
BT  - Scientia Marina
KW  - radar
KW  - pressure gauges
KW  - sea level changes
KW  - sea level measurement
KW  - tide gauges
KW  - Kerguelen Islands
KW  - GPS buoy
KW  -
N2  - Considerable efforts are being made worldwide to upgrade tide gauge networks using new technologies. Because of the unique location of the Kerguelen Islands, the measurement of sea level there has received particular attention, with up to four systems equipped with modern sensors functioning simultaneously (two pressure tide gauges, a radar tide gauge, and a GPS-equipped buoy). We analysed and compared the sea level data obtained with these systems from 2003 to 2010, together with a time series of tide pole observations. This is the first time that a multi-comparison study with tide gauges has been undertaken over such a long time span and that the stability of modern radar tide gauges has been examined. The multi-comparison enabled us to evaluate the performance of the tide gauges in several frequency ranges, identify errors and estimate their magnitude. The drift of the pressure sensors (up to 8.0 mm/yr) was found to be one of the most relevant sources of systematic error. Other sources of difference such as clock drift, scale error and different locations of the instruments were also detected. After correcting the time series of sea level for these errors we estimated an upper bound for the radar instrumental error in field condition at ~0.3 cm.
SN  - 0214-8358
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=1845), last updated on Tue, 30 Nov 1999 00:00:00 +0100
ID  - BelenMartinMiguez2012
ER  -