Sentences with phrase «in ocean oxygen»

If a civilization uses fossil fuels, the climate change they trigger can lead to a large decrease in ocean oxygen levels.

Other consequences include a decline in ocean oxygen, the bleaching of coral reefs, and the melting of sea ice and ice shelves.

The collision wasn't directly responsible for the extinction, but rather triggered a series of events, such as massive volcanism and changes in ocean oxygen, sea level and climate.

Not exact matches

«Estimates are that up to 80 % of the oxygen you are breathing in right now comes from the ocean.

Dead spots in the ocean, where there is no oxygen.

Bacteria thrive virtually everywhere on Earth — from sub-zero temperatures to over 750 degrees F (in hydrothermal vents at the bottom of the ocean), and in widely varying oxygen, pressure and nutrient conditions.

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.

When hydrogen and oxygen combine in a planet's atmosphere, they can ignite into a ball of fire and then leave behind liquid water oceans that would be good for life

In addition to temperature, wind, and solar radiation data, the Pacific saildrones are measuring how the ocean and air exchange gases like carbon dioxide and oxygen, and they are using Doppler instruments to gauge currents coursing up to 100 meters below the surface.

In the process, they might identify a planet's surface features — such as oceans, continents, ice caps and even cloudbanks — and detect the presence of biomarkers like oxygen, methane and water.

And new research shows how genetic alterations in this odd - colored blood have helped the octopus colonize the world's wide oceans — from the deep, freezing Antarctic to the warm equatorial tropics.The iron - based protein (hemoglobin) that carries oxygen in the blood for us red - blooded vertebrates becomes ineffective when faced with low - oxygen levels.

Aside from myriad practical applications, these organisms could exemplify the kinds of life that exist in environments where little or no oxygen exists, such as the deep ocean or under the Martian surface.

«And the transition seemed to occur right around the time that there were very large changes in ocean - atmosphere oxygen levels and just before the emergence of animals.»

Examining the distribution patterns of microfossils, Shen's Harvard colleagues have discovered that the marine eukaryotic algae of 1.5 billion years ago occupied only the ocean shallows and not the deeper basins, indicating a smaller oxygen concentration in the atmosphere than exists today.

That devastation could spread in the future, as rising temperatures and agricultural runoff enlarge oxygen - poor dead zones in the world's oceans.

Shen's own work demonstrates that the deeps of the Proterozoic ocean were full of sulfidic gases, not dissolved oxygen, and indicates that a complex natural environment, complete with a food chain and natural selection, was in place on Earth at an early date.

About 2.7 billion years ago, photosynthetic algae in the oceans started making their mark, taking in carbon dioxide as fuel and sending the by - product — oxygen — skyward.

«A lot of that is associated with oxygen minimum zones, hypoxia in the ocean, dead zones.

Both processes occur in regions of the ocean that are naturally low in oxygen, or anoxic, due to local lack of water circulation and intense phytoplankton productivity overlying these regions.

This includes places like parts of the eastern Pacific Ocean where small animals like nematodes and specially adapted fish live on the fringes of habitability, subsisting in waters where oxygen concentrations can be only about 1 % of normal surface water levels.

«As the climate goes up, the amount of oxygen will go down, but it's really hard to look in the ocean to see that change,» he said.

It takes centuries longer for some effects to kick in fully, such as the oceans becoming poorer in oxygen as they slowly warm.

In some ancient eras, according to other recent work on ocean chemistry, marine animals lived in «worlds of lower oxygen,» Lyons sayIn some ancient eras, according to other recent work on ocean chemistry, marine animals lived in «worlds of lower oxygen,» Lyons sayin «worlds of lower oxygen,» Lyons says.

Curtis Deutsch, associate professor at the University of Washington's School of Oceanography, studies how increasing global temperatures are altering the levels of dissolved oxygen in the world's oceans.

Meanwhile, in the last 20 years, the OMZ had expanded upward toward the ocean surface by 40 meters, and oxygen levels had fallen by 20 percent in the past decade.

By the late Mesozoic, the ocean mid-waters were no longer low in oxygen.

By accounting for both CO2 and oxygen levels in the atmosphere, scientists have calculated that oceans and plants each absorb roughly one - quarter of humanity's CO2 emissions, leaving half to build up in the atmosphere.

Researchers working in Papua New Guinea think they may have been wiped out when the level of oxygen in the oceans rose dramatically, stimulating the evolution of oxygen - hungry fish that simply out - competed the ammonites for resources.

We can thank them for oxygen in the atmosphere, oil in the lithosphere as well as dead zones in the oceans and now even a dead horse in France.

Those sites gave her the chance to gather fossils from many different depths in the ancient ocean, from the more oxygen - rich surface waters to deeper zones.

«It's probably too early to conclude exactly which geochemical changes in the Ediacaran oceans were responsible for the shift to large body sizes, but there are strong contenders, especially increased oxygen, which animals need for respiration.»

Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near - modern levels in the ocean could have spurred the Cambrian explosion.

More broadly, previous research had found that oxygen levels had declined in OMZs in the Indian, Pacific and Atlantic oceans since the 1950s.

These winds also started to generate ocean currents, which in combination with the expansion of an oxygen minimum zone caused several of the atolls to be submerged.

These concentrations could have sustained small, simple animals, just as they do today in the ocean's oxygen - poor zones.

These proxies seemed to indicate that oxygen concentrations in the oceans rose in several steps, approaching today's sea - surface concentrations at the start of the Cambrian, around 541 million years ago — just before more - modern animals suddenly appeared and diversified.

A study published in Geophysical Research Letters in 2011 found widespread declines in oxygen concentration in the upper ocean between the 1970s and the 1990s.

«When tiny bacteria in the ocean began producing oxygen, it was a major turning point and changed the chemistry of the Earth,» explained Katsev.

While oxygen is believed to have first accumulated in Earth's atmosphere around 2.45 billion years ago, new research shows that oceans contained plentiful oxygen long before that time, providing energy - rich habitat for early life.

But climate models predict reductions in dissolved oxygen in all oceans as average global air and sea temperatures rise, and this may be the main driver of what is happening there, she says.

Scientists say reserves can help marine ecosystems and people adapt to five key impacts of climate change: ocean acidification; sea - level rise; increased intensity of storms; shifts in species distribution, and decreased productivity and oxygen availability.

«The water in the Arctic and Antarctic Oceans is extremely cold, but also very rich in oxygen.

Climate change could reduce oxygen levels in the oceans by 40 per cent over the next 8000 years, leading to dramatic changes in marine life

That was the key message of a new study recently published in the journal Science, in which American and German biologists defined the first universal principle on the combined effects of ocean warming and oxygen loss on the productivity of marine life forms.

In this regard, one of the key questions is: How will the warming of the oceans and resultant decrease in dissolved oxygen impact marine life forms» productivitIn this regard, one of the key questions is: How will the warming of the oceans and resultant decrease in dissolved oxygen impact marine life forms» productivitin dissolved oxygen impact marine life forms» productivity?

«If the oxygen level in a given region of the ocean drops below a species» minimum requirements, it forces the animals to abandon their native habitat.

Around 2.7 billion years ago the first oxygen - producing photosynthesis evolved in the oceans.

Despite the importance of oxygen levels, relatively little information has been collected across the vast watery reaches of earth and this research is confined to six areas in the Atlantic, Pacific and Indian oceans.

The problem stems from oxygen reduction in deep water, a phenomenon that some scientists are observing in oceans worldwide, and that may be related to climate change.

The new sea - level record was then used in combination with existing deep - sea oxygen isotope records from the open ocean, to work out deep - sea temperature changes.