Sentences with phrase «ocean oxygen levels during»

The latest results come at a time when scientists are already reconsidering what was happening to ocean oxygen levels during this crucial period.

Not exact matches

Researchers analyzed the levels of various trace elements in hundreds of samples of carbon - rich shales that had been deposited in oxygen - poor regions of the ocean surrounding ancient continents during the past 3.5 billion years.

Mild oxygen levels in shallow seas but oxygen - poor deep oceans lasted for some 1.3 billion years during a time that has been dubbed the «Boring Billion» but eventually led to the development of mitochondria that now power multicellular planet and animal life (Nick Lane, New Scientist, February 10, 2010; Rachel Ehrenberg, Science News, September 29, 2009; Johnston et al, 2009; and H.D. Holland, 2006).

This has potentially broad implications sulfate and oxygen levels in the oceans during this time, for the our understanding of Earth's ancient ecosystems.

Add the facts in trend: The oceans are acidifying, The climate has already shifted 4 degrees of latitude in the past 30 years; the Arctic will likely be virtually ice free during the summer melt within the decade, all the uncertainty ranges are positive and none of them are negative, CO2 is plant food, but what does that mean when the oxygen levels are dropping, the Hoover dam is supposed to shut down in 2023 due to no water (latitudinal shift), the Yangtze in China is getting very low, etc. etc..

Enhanced nutrient levels thus increased ocean production in the surface and oxygen consumption in the deep ocean, causing ~ 50 % and at least 40 % of the ocean volume to become dysoxic / anoxic during OAE 1a and OAE 2 respectively.