0 Members and 1 Guest are viewing this topic.
Yes. It is. The layers have different toncicities. Submarines use them to hide from other submarines. I know this is true 'cos I saw it on the telly.
Ocean layers come in several varieties. The first is called the 'halocline' or some such, and refers to lighter fresher water that floats on top of salty ocean water. This happens when rivers flow into salt water, for example. It can be a very well defined layering much more extreme then seen in the atmosphere. For instance, I know of at least one case where a submarine began a dive from the surface, but was bounced back to the surface when it descended into the denser, saltier water below. It was subsequently lost to enemy gun fire before it could get down again. Another form of layering simply involves temperature variation. A warmer current simply gliding above a converging colder, denser flow. I don't know how many halocline and thermocline layers can stack up one on the other.A less well defined layering is defined by oxygen content in the body of water itself. Various bodies of water, such as the Black Sea, have very little turbulence at very deep levels to such an extent that all the oxygen has been used up long ago. Ballard actually found and remotely videoed a 1,500 year old Byzantine ship wreck.I remember he said he hoped to find a nearly intact wooden boat with the stump of a mast and plenty of cargo. In fact, what he found included the entire mast with what looked like a recently tied knot at the top. The anarobic, cold environment left the ship intact, like a fly in amber. Quite remarkable. I do not think it has yet been excavated.
Speaking of layers - I came across this the other day: http://apod.nasa.gov/apod/ap100216.htmlI know it's not the ocean, but awesome all the same!