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A large research synthesis, published in one of the world's most influential scientific journals, has detected a decline in the amount of dissolved oxygen in oceans around the world — a long-predicted result of climate change that could have severe consequences for marine organisms if it continues.
The paper, published Wednesday in the journal Nature by oceanographer Sunke Schmidtko and two colleagues from the GEOMAR Helmholtz Centre for Ocean Research in Kiel, Germany, found a decline of more than 2 percent in ocean oxygen content worldwide between 1960 and 2010.
The loss of ocean oxygen "has been assumed from models, and there have been lots of regional analysis that have shown local decline, but it has never been shown on the global scale, and never for the deep ocean," said Schmidtko, who conducted the research with Lothar Stramma and Martin Visbeck, also of GEOMAR.
Because oxygen in the global ocean is not evenly distributed, the 2 percent overall decline means there is a much larger decline in some areas of the ocean than others.
Moreover, the ocean already contains so-called oxygen minimum zones, generally found in the middle depths. The great fear is that their expansion upward, into habitats where fish and other organism thrive, will reduce the available habitat for marine organisms.
In shallower waters, meanwhile, the development of ocean "hypoxic" areas, or so-called "dead zones," may also be influenced in part by declining oxygen content overall.
On top of all of that, declining ocean oxygen can also worsen global warming in a feedback loop. In or near low oxygen areas of the oceans, microorganisms tend to produce nitrous oxide, a greenhouse gas. Thus the new study "implies that production rates and efflux to the atmosphere of nitrous oxide ... will probably have increased."
(Score: 2) by butthurt on Friday February 17 2017, @08:56PM
The OP acknowledged that "climate change is a fact" but noted that various observations have been ascribed to global warming, including, counter-intuitively, an episode of unusually cold weather. The OP seems to think that the way a variety of phenomena have been attributed to one cause amounts to intellectual dishonesty.
For me the page you linked doesn't display properly. From what I can see of it, and from your comment, I'm guessing it says the global average temperature in 2014 reached a record high. If it doesn't explain the connection between that and the cold winter in North America, it may not address the OP's remarks.
(Score: 3, Informative) by Hawkwind on Friday February 17 2017, @10:55PM
However the reason has received a good amount of attention this year. Here's one link http://www.sciencealert.com/satellite-data-shows-the-polar-vortex-is-shifting [sciencealert.com].