Figure 1 shows that the uppermost layer is occupied by a western direction
stream, which is more developed at 68° E and noticeably weaker at 65° E. At the
same time, in the northern and southern parts of the 65° E section this current
penetrates to a depth of 30 m (in the south) and up to 80 m in the north and almost
completely disappears at the equator. This current fairly stably occupies the entire
upper 30-m layer along the 68° E section. The maximum speeds here exceed
40 cm/s.
Under the westward stream, the equatorial eastward countercurrent (Tareev
Current) is clearly pronounced. Here we see the opposite situation. At 65° E, the
core of the current in the form of a powerful jet of the eastern direction is located
between 2.2° S and 1° N with the maximum speeds almost at the equator. In the
region of the core, the current occupies the depths from the surface to 150 m. The
velocities in the current exceed 60 cm/s at a depth of about 50 m. The width of
the stream in the meridional direction is about 350 km. In the northern part of the
Fig. 1. Zonal current components of velocity in the upper 300 m over the cross equator sections
at 65° E (a) and 68° E (b), measured by two up-looking and down-looking DVS-750 showing the
eastward Equatorial Undercurrent from February 15 to 23, 2017. The red tones are related to the
eastern direction
Tareev Equatorial Undercurrent in the Indian Ocean
497
stream, which is more developed at 68° E and noticeably weaker at 65° E. At the
same time, in the northern and southern parts of the 65° E section this current
penetrates to a depth of 30 m (in the south) and up to 80 m in the north and almost
completely disappears at the equator. This current fairly stably occupies the entire
upper 30-m layer along the 68° E section. The maximum speeds here exceed
40 cm/s.
Under the westward stream, the equatorial eastward countercurrent (Tareev
Current) is clearly pronounced. Here we see the opposite situation. At 65° E, the
core of the current in the form of a powerful jet of the eastern direction is located
between 2.2° S and 1° N with the maximum speeds almost at the equator. In the
region of the core, the current occupies the depths from the surface to 150 m. The
velocities in the current exceed 60 cm/s at a depth of about 50 m. The width of
the stream in the meridional direction is about 350 km. In the northern part of the
Fig. 1. Zonal current components of velocity in the upper 300 m over the cross equator sections
at 65° E (a) and 68° E (b), measured by two up-looking and down-looking DVS-750 showing the
eastward Equatorial Undercurrent from February 15 to 23, 2017. The red tones are related to the
eastern direction
Tareev Equatorial Undercurrent in the Indian Ocean
497