Figure 10.5 Global, time-averaged topography of the ocean for the period 1992–2002 from a joint analysis of drifter, satellite altimeter, wind, and the GRACE Gravity Model-01 data by Nikolai Maximenko (IPRC) and Peter Niiler (SIO). Geostrophic currents at the ocean surface are parallel to the contours. Compare with Figure 2.8 calculated from hydrographic data. For more information, see Maximenko (2005) (a 1MB pdf file). Click on the image for a zoom. From Asia-Pacific Data-Research Center.