Fig. 2
From: Historical findings of the Russian physical oceanographers in the Indian Ocean
Dynamic heights and geostrophic currents at a depth of 150 m based on the data of the first (January 21–February 7, 1967) (a) and second (March 20–April 6, 1967) b hydrographic surveys of the Polygon-67 expedition (Koshyakov et al. 1970). The numerals at the isobars are proportional to the weights of the water columns between 150 and 1500 m. The dots indicate the locations of the hydrographic stations with the measurements using the reversing thermometers and Nansen bottles. The arrows show the direction of the currents while the numerals in the circles denote the velocities in cm/s. We estimated uncertainties of the geostrophic velocities from the calculations as ±2 cm/s