Fig. 3: Variability of the Luzon Strait overflow.

Fifteen-day lowpass (thin lines in pink and yellow), 120-day lowpass (thick lines in red and orange), and semi-annual mean (blue and cyan bars) series of along-channel velocity and potential temperature (θ) of the deepest instruments at a BC and b LT are shown, respectively. Positive (negative) velocity indicates that waters flow into (out of) the South China Sea. Semi-annual denotes winter half year (October–March in the next year) and summer half year (April–September). Noting that the last bar is April–June due to the length of observations. The abbreviations BC and LT represent BC mooring and LT mooring, respectively.