4
G. DIETRICH:
siderable evaporation in the inner Gulf and it spreads on the bottom. This deep water
leaves the Gulf through the exit on the bottom, sinks further down and forms a layer in
parts of the Arabian Sea. Some renewal takes place thanks to this process, but is relatively
small, yet the water is not .as poor in O2 as it would be without this renewal with water
Fig. 3. Surface currents (geostrophic) in the Arabian Sea in summer 1963. (After DUING, 1970)
Represented by the dynamic topography of the sea surface (in dynamic cm), referred to the
800 decibar surface. H: Height of the sea level, center of anticyclonic gyres. L: Lows of the sea level,
center of cyclonic gyres. Dotted line: 1000 m
rich in O2 , This can be shown by comparing the O2 distribution of the western and the
eastern parts of the Arabian Sea.
The outflow of Persian Gulf water and of Red Sea water influenced by the Corio lis
forces prefers the western boundary, the eastern boundary being low in renewal. Two
examples of the O2 sections worked by "Meteor", one off Somalia, the other off the
Indian coast, are shown in Fig. 2. In both cases the O2 content is low, sometimes lower
than 0.5 mll-" but much lower off India than off Somalia. The layer with values below
0.5 mll- 1 reaches from 100 to 1500 m, and the values in a layer of 500 m thickness are
even below 0.05 mIl-I, which means less than 1% saturation. This is the lowest O2
content in such a large region in the entire open world ocean. Additional measurements by
G. DIETRICH:
siderable evaporation in the inner Gulf and it spreads on the bottom. This deep water
leaves the Gulf through the exit on the bottom, sinks further down and forms a layer in
parts of the Arabian Sea. Some renewal takes place thanks to this process, but is relatively
small, yet the water is not .as poor in O2 as it would be without this renewal with water
Fig. 3. Surface currents (geostrophic) in the Arabian Sea in summer 1963. (After DUING, 1970)
Represented by the dynamic topography of the sea surface (in dynamic cm), referred to the
800 decibar surface. H: Height of the sea level, center of anticyclonic gyres. L: Lows of the sea level,
center of cyclonic gyres. Dotted line: 1000 m
rich in O2 , This can be shown by comparing the O2 distribution of the western and the
eastern parts of the Arabian Sea.
The outflow of Persian Gulf water and of Red Sea water influenced by the Corio lis
forces prefers the western boundary, the eastern boundary being low in renewal. Two
examples of the O2 sections worked by "Meteor", one off Somalia, the other off the
Indian coast, are shown in Fig. 2. In both cases the O2 content is low, sometimes lower
than 0.5 mll-" but much lower off India than off Somalia. The layer with values below
0.5 mll- 1 reaches from 100 to 1500 m, and the values in a layer of 500 m thickness are
even below 0.05 mIl-I, which means less than 1% saturation. This is the lowest O2
content in such a large region in the entire open world ocean. Additional measurements by