Stalagmite research suggests Earth has two modes of responding to change

By analyzing stalagmites, a team of researchers has determined that the climate signature in the tropics through four glacial cycles looks different in some ways and similar in others when compared to the climate signature at high latitudes. The results suggest that Earth's climate system might have two modes of responding to significant changes.

Increasing speed of Greenland glaciers gives new insight for rising sea level

Changes in the speed that ice travels in more than 200 outlet glaciers indicates that Greenland's contribution to rising sea level in the 21st century might be significantly less than the upper limits some scientists thought possible, a new study shows.

Marine food chain becomes clearer with new revelations about prey distribution

A new study has found that each step of the marine food chain is clearly controlled by the trophic level below it -- and the driving factor influencing that relationship is not the abundance of prey, but how that prey is distributed.

Arctic sea-ice loss didn't happen by chance

The ongoing rapid retreat of Arctic sea ice is often interpreted as the canary in the mine for anthropogenic climate change. In a new study, scientists have now systematically examined the validity of this claim. They find that neither natural fluctuations nor self-acceleration can explain the observed Arctic sea-ice retreat. Instead, the recent evolution of Arctic sea ice shows a strong, physically plausible correlation with the increasing greenhouse gas concentration. For Antarctic sea ice, no such link is found – for a good reason.

Ireland's Aran Islands: Old maps and dead clams help solve coastal boulder mystery

Perched atop the sheer coastal cliffs of Ireland's Aran Islands, ridges of giant boulders have puzzled geologists for years. What forces could have torn these rocks from the cliff edges high above sea level and deposited them far inland? While some researchers contend that only a tsunami could push these stones, new research finds that plain old ocean waves, with the help of some strong storms, did the job.

Global warming refuge discovered near at-risk Pacific island nation of Kiribati

Scientists predict ocean temperatures will rise in the equatorial Pacific by the end of the century, wreaking havoc on coral reef ecosystems. But a new study shows that climate change could cause ocean currents to operate in a way that mitigates warming near a handful of islands right on the equator.

Pacific islands on equator may become refuge for corals in a warming climate due to changes in ocean currents

Scientists have predicted that ocean temperatures will rise in the equatorial Pacific by the end of the century, wreaking havoc on coral reef ecosystems. But a new study shows that climate change could cause ocean currents to operate in a surprising way and mitigate the warming near a handful of islands right on the equator. As a result these Pacific islands may become isolated refuges for corals and fish.

Scientists provide first large-scale estimate of reef shark losses in the Pacific Ocean

First study to provide estimates of reef shark losses in the Pacific Ocean are sobering. Researchers noted the enormous detrimental effect that humans have on reef sharks.

First evaluation of the Clean Water Act's effects on coastal waters in California reveals major successes

Levels of copper, cadmium, lead and other metals in Southern California's coastal waters have plummeted over the past four decades, which researchers attribute to sewage treatment regulations that were part of the Clean Water Act of 1972 and to the phase-out of leaded gasoline in the 1970s and 1980s.

Wind pushes plastics deeper into oceans, driving trash estimates up

Decades of research into how much plastic litters the ocean, conducted by skimming only the surface, may in some cases vastly underestimate the true amount of plastic debris, according to an oceanographer.

Warm ocean currents cause majority of ice loss from Antarctica

Warm ocean currents are the dominant cause of recent ice loss from Antarctica, new research shows. New techniques have been used to differentiate, for the first time, between the two known causes of melting ice shelves - warm ocean currents attacking the underside, and warm air melting from above. This finding brings scientists a step closer to providing reliable projections of future sea-level rise.

Study finds surprising Arctic methane emission source

The fragile and rapidly changing Arctic region is home to large reservoirs of methane, a potent greenhouse gas. As Earth's climate warms, the methane, frozen in reservoirs stored in Arctic tundra soils or marine sediments, is vulnerable to being released into the atmosphere, where it can add to global warming. Now a multi-institutional study has uncovered a surprising and potentially important new source of Arctic methane: the ocean itself.

Geophysicists employ novel method to identify sources of global sea level rise

As the Earth's climate warms, a melting ice sheet produces a distinct pattern of sea level change known as its sea level fingerprint. Now, geophysicists have found a way to identify the sea level fingerprint left by a particular ice sheet, and possibly enable a more precise estimate of its impact on global sea levels.

Fish larvae find the reef by orienting: The earlier the better

For the first time, a numerical study incorporates horizontal larval fish navigation skills into realistic 3D flow fields, creating a powerful tool that spells out how larvae use environmental cues to find their way back to the reef after being out on the open ocean. This model can be used for a wide variety of marine species.

New ecological model for deep-water oil spills

On the second anniversary of the Deepwater Horizon oil platform blowout, a national panel of researchers is providing new insight into what happened in the disaster, as well as a guide for how to deal with such events in the future, and why existing tools were inadequate to predict what lay before them.

Marine scientists urge government to reassess oil spill response

On the second anniversary of the Deepwater Horizon blowout, a national panel of researchers is urging the US federal government to reassess how it would respond to similar oil spills that might occur in the future.

Jellyfish on the rise in world's coastal ecosytems

Jellyfish are increasing in the majority of the world's coastal ecosystems, according to the first global study of jellyfish abundance.

Understanding of hearing in baleen whales amplified

For decades, scientists have known that dolphins and other toothed whales have specialized fats associated with their jaws, which efficiently convey sound waves from the ocean to their ears. But until now, the hearing systems of their toothless grazing cousins, baleen whales, remained a mystery, largely because specimens to study are hard to get. Now, a new study has shown that some baleen whales also have fats leading to their ears.

Can sound science guide dispersant use during subsea oil spills?

On the second anniversary of the Deepwater Horizon Oil Spill, a pair of researchers are testing whether sound waves can be used to determine the size of oil droplets in the subsea—knowledge that could help guide the use of chemical dispersants during the cleanup of future spills.

The submarine volcano of El Hierro Island continues its degassing

Researchers have found that the submarine volcano of El Hierro (Canary Islands) continues expelling gases, which are primarily carbon dioxide. No sulfur compounds were detected.