《Table 2.Durations and mean speeds of the first group (KMS-type) and three subgroups of second group

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《Seasonal characteristics and forcing mechanisms of the surface Kuroshio branch intrusion into the South China Sea》

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EC stands for entrance channel，N the number of drifters entering from an entrance.the duration；and the total average values of the mean speed of each drifter passing through the LS and that during the two days before entering the LS，respectively；RT and R

To understand the character of the surface KB，we calculated the daily mean speed of each drifter and then the characteristic parameters.The latter included the duration and mean speed of each drifter passing through the LS，as well as the westward component of the mean speeds.The main statistical information of the first and second group drifters is listed in Tables 2 and 3.Figure 4shows the mean speed difference（）of each drifter in the second group during the two days before and after they entered the LS.Figure 4 shows that the distribution of samples was not uniform.Specifically，samples of the first subgroup drifters（KB type）were large and aggregated，but those of the second and third subgroup were fewer and scattered.Statistical information of the latter are also listed in Table 2 for reference.