Extended Data Fig. 4: Drifter data quantity statistics and mean near-surface ocean current fields under weak TCs.

(a1, b1, c1, d1) are numbers of drifter records within \({r < 7R}_{{\rm{\max }}}\) for the period of 1991–2005, and (a2, b2, c2, d2) are the same as (a1, b1, c1, d1) but for 2006–2020, respectively. Global mean current fields, (e1, f1, g1) are for 1991–2005 and (e2, f2, g2) are for 2006–2020, and (e3, f3, g3) are changes of the mean currents between the two periods (2006–2020 minus 1991–2005). a1, a2 are for weak TCs range from 17 to 42 m s⁻¹. b1, b2, e1-e3 are for weak TCs range from 17 to 32 m s⁻¹, c1, c2, f1-f3 are for weak TCs whose LMI is 17 to 32 m s⁻¹, d1, d2, g1-g3 are for weak TCs whose LMI is 17 to 42 m s⁻¹, respectively.