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|Global warming doubles risk of extreme La Niña event, research shows|
The risk of extreme La Niña events in the Pacific Ocean could double due to global warming, new research has shown. El Niño and La Niña events are opposite phases of the natural climate phenomenon, the El Niño/Southern Oscillation. Extreme La Niña events occur when cold sea surface temperatures in the central Pacific Ocean contrast with the warming land areas of Maritime Southeast Asia in the west and create a strong temperature gradient.
Publ.Date : Mon, 26 Jan 2015 12:47:23 EST
3-D view of Greenland Ice Sheet opens window on ice history
Scientists using ice-penetrating radar have created 3-D maps of the age of the ice within the Greenland Ice Sheet. The new maps will aid future research to understand the impact of climate change on the ice sheet. The Greenland Ice Sheet is the second largest mass of ice on Earth, containing enough water to raise ocean levels by about 20 feet.
Publ.Date : Fri, 23 Jan 2015 14:09:43 EST
Alamo impact crater: New study could double its size
Carbonate rock deposits found within the mountain ranges of south-central Nevada, USA, record evidence of a catastrophic impact event known as the Alamo impact. This event occurred roughly 382 million years ago when the ancient seafloor was struck and a submarine crater was formed. The crater was filled-in with fragmented rock, and later with more typical ocean deposits, as the energy from the impact lessened and the environment returned to normal.
Publ.Date : Fri, 23 Jan 2015 10:25:41 EST
Ocean could hold key to predicting recurring extreme winters
New reserch may help to predict extreme winters across Europe by identifying the set of environmental conditions that are associated with pairs of severe winters across consecutive years. Pairs of extreme winters in Europe have been found to coincide with high pressure over the Arctic and a band of low pressure immediately to the south, a set of atmospheric conditions known as a negative Arctic Oscillation, scientists have observed.
Publ.Date : Fri, 23 Jan 2015 10:20:33 EST
Arctic ice cap slides into the ocean
Satellite images have revealed that a remote Arctic ice cap has thinned by more than 50 metres since 2012 -- about one sixth of its original thickness -- and that it is now flowing 25 times faster. The findings show that over the last two decades, ice loss from the south-east region of Austfonna, located in the Svalbard archipelago, has increased significantly. In this time, ice flow has accelerated to speeds of several kilometres per year, and ice thinning has spread more than 50km inland -- to within 10km of the summit.
Publ.Date : Fri, 23 Jan 2015 08:17:23 EST
Study projects unprecedented loss of corals in Great Barrier Reef due to warming
The coverage of living corals on Australia's Great Barrier Reef could decline to less than 10 percent if ocean warming continues, according to a new study that explores the short- and long-term consequences of environmental changes to the reef.
Publ.Date : Thu, 22 Jan 2015 10:32:42 EST
Small drop in sea level had big impact on southern Great Barrier Reef
A small drop in sea level 2000 years ago on the southern Greater Barrier Reef led to a dramatic slowdown in the coral reef's growth, research shows. The researchers analyzed samples from One Tree Reef in the southern Great Barrier Reef. They radiocarbon dated sediment cores from the lagoons of the coral reef to calculate sand infilling. Sea level change was calculated by dating fossil samples from micro-atolls.
Publ.Date : Thu, 22 Jan 2015 10:32:36 EST
Fossils survive volcanic eruption to tell us about the origin of the Canary Islands
The most recent eruption on the Canary Islands – at El Hierro in 2011 – produced spectacularly enigmatic white “floating rocks” that originated from the layers of oceanic sedimentary rock underneath the island. An international team of researchers used microscopic fossils found in the rocks to shed new light on the long-standing puzzle about the origin of the Canary Islands. Despite being violently transported through the volcano, some of the rocks produced by the El Hierro eruption contain microscopic fossils of delicate single-celled marine organisms, making the survival of these fossils all the more extraordinary.
Publ.Date : Thu, 22 Jan 2015 08:45:39 EST
Drillers help make new Antarctic discoveries
An expedition to Antarctica yields new information about how climate change affects Antarctic glaciers. The study has discovered a new ecosystem, researchers report, including a unique ecosystem of fish and invertebrates living in an estuary deep beneath the Antarctic ice.
Publ.Date : Wed, 21 Jan 2015 14:48:44 EST
Two lakes beneath the ice in Greenland, gone within weeks
Researchers discovered craters left behind when two sub-glacial lakes in Greenland drained away -- an indication that the natural plumbing system beneath the ice sheet is overflowing with meltwater. One lake once held billions of gallons of water and emptied to form a mile-wide crater in just a few weeks. The other lake has filled and emptied twice in the last two years.
Publ.Date : Wed, 21 Jan 2015 13:51:56 EST
Climate change threatens 30 years of sea turtle conservation success
A new study is sounding the alarm about climate change and its potential impact on more than 30 years of conservation efforts to keep sea turtles around for the next generation. Climate change is causing sea-level rise, and how coastal communities react to that rise could have dire consequences for sea turtles and other wildlife that rely on an unobstructed beach for survival, researchers say.
Publ.Date : Wed, 21 Jan 2015 10:32:32 EST
Greenland Ice: The warmer it gets the faster it melts
Melting of glacial ice will probably raise sea level around the globe, but how fast this melting will happen is uncertain. In the case of the Greenland Ice Sheet, the more temperatures increase, the faster the ice will melt, according to computer model experiments by geoscientists.
Publ.Date : Tue, 20 Jan 2015 15:12:21 EST
Climate change does not bode well for picky eaters
In a part of the world that is experiencing the most dramatic increase in temperature and climate change, two very similar species of animals are responding very differently. New research suggests that how these species have adapted to co-exist with one another might be to blame.
Publ.Date : Tue, 20 Jan 2015 12:13:04 EST
Pioneer study examines declining coral reef health due to pesticides/sea surface temperatures
Coral reef health is declining worldwide. To better understand the combined effects of mosquito pesticides and rising sea-surface temperatures, researchers exposed coral larvae to selected concentrations of pesticides and temperatures, and published their results.
Publ.Date : Tue, 20 Jan 2015 12:05:01 EST
Giant atmospheric rivers add mass to Antarctica's ice sheet
Extreme weather phenomena called atmospheric rivers were behind intense snowstorms recorded in 2009 and 2011 in East Antarctica. The resulting snow accumulation partly offset recent ice loss from the Antarctic ice sheet, report researchers.
Publ.Date : Tue, 20 Jan 2015 11:22:06 EST
Ocean floor dust gives new insight into supernovae
Extraterrestrial dust from the depths of the ocean could change the way we understand supernovae. Scientists have found the amount of plutonium in the dust is much lower than expected.
Publ.Date : Tue, 20 Jan 2015 10:25:04 EST
Melting glaciers have big carbon impact
As Earth warms, scientists have been focused on how glaciers melting will affect sea level rise. But, another lurking impact is the amount of carbon that will be released when glaciers melt. This is the first attempt to calculate how much carbon will be released.
Publ.Date : Mon, 19 Jan 2015 12:45:22 EST
Atmospheric rivers, cloud-creating aerosol particles, and california reservoirs
In the midst of the California rainy season, scientists are embarking on a field campaign designed to improve the understanding of the natural and human-caused phenomena that determine when and how the state gets its precipitation. They will do so by studying atmospheric rivers, meteorological events that include the famous rainmaker known as the Pineapple Express.
Publ.Date : Sat, 17 Jan 2015 10:42:46 EST
Wildlife loss in the global ocean not as dire as on land
Over the past 500 years, approximately 500 land-based animal species have gone the way of the dodo, becoming extinct as a result of human activity. In the ocean, where scientists count only 15 or so such losses, the numbers currently aren't nearly as dire.
Publ.Date : Thu, 15 Jan 2015 14:22:41 EST
For sea turtles, there's no place like magnetic home
Adult sea turtles find their way back to the beaches where they hatched by seeking out unique magnetic signatures along the coast, according to new evidence.
Publ.Date : Thu, 15 Jan 2015 13:47:13 EST