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Three Decades of in Situ Sea Surface Salinity Measurements in the Tropical Pacific Ocean |
1990-1999 Thermosalinograph data |
| Data origin.
The thermosalinograph-derived SSS measurements originate mainly from a ship-of-opportunity
program operated from IRD-Noumea since the early 1990’s (see Hénin and Grelet, Deep
Sea Res., 43, 1833-1856, 1996), with additional measurements from thermosalinographs
installed onboard IRD, IFREMER, PMEL and JAMSTEC research vessels. A total of 27 vessels
were involved (see the ship codes). Most of the IRD
measurements were collected every 15 s from SeaBird SBE-21 thermosalinograph instruments,
and a median filter over 5 mn was applied to reduce small scale signal. Validation procedure and quality control. Preliminary quality assurance was handled through procedures that verified for internal consistency and climatic limits. For each transit, geographic positions and SSS values were plotted on a map in order to visually detect position errors and/or dubious measurements. Then, each value was compared with the 1979-1992 mean value and standard deviation (file climsss, see gridded data section) computed in the nearest 2° latitude x 10° longitude rectangle. When available, simultaneous bucket samples and/or CTD measurements, as well as the pre/post calibration coefficients of the sensors, were further considered in order to accept, correct or reject the SSS data. The quality of the data can be estimated by seven quality codes. Spatial distribution of observations and data access. The thermosalinograph-derived SSS data are plotted and available by year, from 1990 to 1999. |
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 1990, 1991,
1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 TSG
data |
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| How to read the data : format and Fortran programs,
readme |
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©Copyright IRD July 2000 |