New method of temperature and conductivity sensor calibration with improved efficiency for screening SBE41 CTD on Argo floats

Progress in Earth and Planetary Science

Table 8 Eight experiments of J-Calibration for the three sensors (S/N 914, 918, and 922).

Float number	Exp. Date	Float data (X_float)			Standard sensor data (X_ref)			Difference (X_float−X_ref)
Float number	Exp. Date	T (°C)	C (S m⁻¹)	S (PSS-78)	T (°C)	C (S m⁻¹)	S (PSS-78)	ΔT (× 10⁻³ °C)	ΔC (× 10⁻³ S m⁻¹)	ΔS (× 10⁻³ PSS78)
914	April 23, 2018	23.38	5.146	35.06	23.38	5.145	35.05	0.66	0.614	4.18
914	April 23, 2018	23.17	5.125	35.06	23.17	5.124	35.05	0.40	0.626	4.49
918	April 24, 2018	22.63	5.058	34.98	22.63	5.058	34.98	0.98	− 0.222	− 2.14
918	April 26, 2018	22.58	5.044	34.91	22.58	5.045	34.91	− 0.44	− 0.359	− 2.44
918	April 26, 2018	22.12	4.998	34.91	22.12	4.998	34.92	0.61	− 0.202	− 2.08
922	April 26, 2018	22.58	5.045	34.92	22.58	5.045	34.91	− 0.69	0.505	4.48
922	April 26, 2018	22.12	4.999	34.92	22.12	4.998	34.92	0.09	0.576	4.45

Differences between SBE41 sensors and standard sensors for temperature, conductivity, and salinity (ΔT, ΔC, and ΔS) are described. Units are 10⁻³ °C, 10⁻³ S m⁻¹, and 10⁻³ PSS-78, respectively. In those experiments, the artificial sea water is set to 35 PSS-78 for salinity and 22–24 °C for temperature