Drift Characteristics of a Moored Conductivity–Temperature–Depth Sensor and Correction of Salinity Data

• DOI: 10.1175/jtech1704.1
• Publication Date: 2005-04-13T19:53:39Z
• Authors: Kentaro Ando; Takeo Matsumoto; Tetsuya Nagahama; Iwao Ueki; Yasushi Takatsuki; Yoshifumi Kuroda
• Keywords: Buoy; Mooring

Abstract The temperature and conductivity drift (time change of the characteristics) moored SBE37IM (CT) sensors was investigated by pre- postdeployment calibration Triangle TransOcean Buoy Network (TRITON). This buoy network comprises western portion basinwide (Tropical Atmosphere Ocean) TAO/TRITON array, which monitors phenomena such as El Niño contributes to forecasting climate change. Over time deployment very small, within 3 mK data. more significant. After 1 yr mooring, observed in shallowest layer (1.5–100 m) positive 0.010 S m−1 [equivalent 0.065 (PSS-78) at 30°C 6 m−1; here, is Ω−1] m −1 on average. Drift thermocline (125–200 also 0.0053 [0.034 (PSS-78)] Conversely, deepest (250–750 0.00002 with a standard deviation 0.001 [0.0065 (PSS-78)]. Assuming linear trend time, authors attempted correct data using corrected for about 80% exhibited smaller differences than uncorrected when compared situ conductivity–temperature–depth (CTD) However, salinity became worse 20% sensors. reasons these errors are discussed this paper.