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|Low Oxygen Zones in Oceans; Climate Impact on Oceans|
|Topic Started: Mar 8 2010, 11:34 PM (478 Views)|
|Xnn||Mar 8 2010, 11:34 PM Post #1|
Here's a news article on growing areas of low oxygen in the oceans.
What's different about this finding is that it is not related to nutrients run off from land.
Instead it appears to be related to circulation of the oceans.
This is consistent with most models of global warming.
However, the time frame is too short to infer how much is from rising CO2 levels and how much are from other factors (including natural variations).
In brief, warming of surface waters acts to impede circulation with deeper waters.
The warm water acts as a cap and keeps the oxygen rich waters confined to the surface.
This like this have happened in the past and lead to mass extinction of many types of sea life.
|sylas old account||Mar 9 2010, 01:05 AM Post #2|
Wow. That news story came out on Sun March 7; and it already has 3131 comments! This board should be so active!
I've long felt that the effects on ocean chemistry of shifting climates are likely to be some of the most pragmatically significant, but I don't know much about hypoxia. The article lists a number of different scientists working on this, and links to three relevant research groups, but not to any specific papers. So I had a quick look around myself. The story mentions Gregory Johnson, of NOAA. He wrote about this in 2008, in
I'd like to know more about the actual physical/chemical mechanisms involved in hypoxia. It seems to be linked with circulation. The key phrase in your news story in relation to the mechanisms seems to be this:
Edited by sylas old account, Mar 9 2010, 01:20 AM.
|SkyHunter||Mar 10 2010, 07:08 PM Post #3|
I wonder how the "warm cap" effecting the pH of the surface layers?
Warmer water means CO2 will be dissolved at a slower rate, yet the surface waters will have more exposure to the atmosphere, hence more time for CO2 to dissolve.
|sylas||May 16 2010, 10:45 PM Post #4|
I have spilt off two posts here specifically on the oil spill in the Gulf of Mexico, and made them a new thread in "General discussion". The oil spill impact is potentially a major topic in its own right, and well worth its own thread.
You can find the new thread at Impacts of oil spill in Gulf of Mexico .[/moderate]
|SkyHunter||Jun 27 2010, 05:38 PM Post #5|
Here is a new paper in Science. Changing Oceans
I am just now reading it, thought it might be helpful in this thread.
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