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Distributions of temperature (°C) and salinity (ppt) in (a, b) surface and (c, d) bottom layers at P5 in 2014 and 2016. (e) Distribution of the density difference (ΔσtΔσt) between the surface and bottom layers. Positive values indicate higher density in the bottom layer. (f) Distribution of ΔσtΔσt as a function of wind direction when tidal range > 0.3 m, and mean daily discharge is less than 150 m3 s−1
