Fig. 1. Distribution of surface temperature and salinity of South China Sea. (a) Temperature; (b) salinity

Fig. 2. Distribution of surface temperature and salinity of East China Sea. (a) Temperature; (b) salinity

Fig. 3. Changes of frequency shift and line width of SBS with temperature and salinity. (a) Frequency shift; (b) line width

Fig. 4. Fitting graphs of frequency shift and line width. (a) Frequency shift; (b) line width

Fig. 5. Schematic of experimental system

Fig. 6. Interference spectrogram collected by ICCD with actual temperature of 20 ℃ and actual salinity of 35‰

Fig. 7. Two-dimensional spectra of scattering signal. (a) Original spectrum; (b) low-pass filtering spectrum; (c) fitting spectrum;(d) deconvolution spectrum

Fig. 8. Error distribution graphs. (a) Measurement errors of frequency shift and line width; (b) inversion errors of temperature and salinity