Environmental Engineering Reference
In-Depth Information
periphery of the Rim Current (Fig. 8A). In some of the very deep anticyclonic
gyres, downwelling of the Cold Intermediate Waters can be traced to depths
up to 1000-1200 m [4]. The diameter of large anticyclonic eddies can attain
50-100 miles with the current velocity of 30-40 cm s
−
1
at their peripheries.
They can persist for about three to six months [71]. The anticyclonic eddies
form a joint hydrodynamic convergence zone along the periphery of the basin
that represent a natural physiochemical barrier between warm and less saline
coastal waters and the open sea waters over the slope edge [73].
Transparency, %
Transparency, %
Figure 8.
Depth distributions of dissolved O
2
,H
2
S, NH
4
+
, and total Mn (all in µM), and
transparency (%) at stations L29M46 (upper panel) and L34M46 (lower panel) of Sakarya
Canyon [7].
The role of mesoscale dynamics on the H
2
S spatial and vertical distributions
has been underestimated in previous years. Descending water in the centers
of anticyclonic eddies influences not only thermohaline characteristics of the
