Dansgaard-Oeschger oscillations and Bond-Heinrich events cause this gradient to deepen in the North Atlantic.
In anchialine caves, it is stratified into nitrate, nitrite, and sulfate zones that mark the incipience of sulfur cycling. Dansgaard-Oeschger oscillations and Bond-Heinrich events cause this gradient to deepen in the North Atlantic. Its widening causes a strong pycnocline to develop between surface and intermediate waters, and its weakness along the Reykjanes Ridge allows dense water to sink. Polar catastrophes involving this boundary prevent the formation of deep ocean water due to the reduction in surface area of high salinity equatorial surface waters. FTP, what is this sharp drop-off with depth in oceanic salinity?  2
In anchialine caves, it is stratified into nitrate, nitrite, and sulfate zones that mark the incipience of sulfur cycling.
halocline