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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Variation of Antarctic circumpolar current and its intensification in relation to the southern annular mode detected in the time-variable gravity signals by GRACE satellite

Fig. 4

a Variation of the zonal component (positive for eastward) of the geostrophic flow Δu derived from the leading EOF mode of the non-seasonal OBP field in Fig. 2c, 2003–2015. b and c are the same as a but for two sub-timespans, January 2003–December 2009 and January 2009–July 2015, respectively. The thick contours denote ±2 mm/s of fluctuation. d The red curves are the Δu profiles along cross sections AA′, BB′ and CC′ in the eastern hemisphere in b, and the black curves are the same w.r.t. c, showing the poleward intensification of the ringed pattern of Δu along BB′ and CC

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