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Vanishing ice puts reindeer herders at risk

Science Daily - Wed, 11/20/2019 - 13:18
Mongolia's Tsaatan reindeer herders depend on munkh mus, or eternal ice, for their livelihoods. Now, soaring global temperatures may threaten that existence.

Icebergs as a source of nutrients

Science Daily - Wed, 11/20/2019 - 11:11
The importance of icebergs as an important source of nutrients in the polar regions has long been discussed. An international research team has investigated ice samples worldwide. A key result is that only a small part of the glacier ice contaminated with sediment contains large amounts of iron, while the vast majority of clean ice contains very little iron.

Impact of climate change on Arctic terns

Science Daily - Mon, 11/18/2019 - 18:09
New study shows how changes in Antarctic sea ice is driving one of the world's smallest seabirds to forage further for food.

Pollution from Athabasca oil sands affects weather processes

Science Daily - Mon, 11/18/2019 - 10:53
Scientists have been looking at pollution affecting the air, land and water around the Athabaska Oil Sands for some time. After looking at contaminants in snow taken from up-to 25 km away from the oil sands, a McGill-led scientific team now suggests that oil sand pollution is also affecting the weather patterns in the surrounding regions.

Going with the floe: Sea ice movements trace dynamics transforming the new Arctic

Science Daily - Thu, 11/14/2019 - 15:19
Scientists have used MODIS satellite imagery to understand long-term ocean movements from sea ice dynamics. The engineers used image-processing algorithms to remove clouds, sharpen details, and separate individual floes. Image analysis algorithms mapped the floe movement over a period of days. The resulting ocean current maps were about as accurate as maps made using traditional methods. Tracking sea ice will help scientists better understand the sources driving sea ice transport.

When reporting climate-driven human migration, place matters

Science Daily - Wed, 11/13/2019 - 14:31
Location matters when talking about how climate might or might not be driving migration from Central America. Climate research in the dry corridor region revealed a complex pattern of change. If you average across the entire region you wouldn't see a trend going either way.

Individual climate models may not provide the complete picture

Science Daily - Tue, 11/12/2019 - 15:49
Equilibrium climate sensitivity -- how sensitive the Earth's climate is to changes in atmospheric carbon dioxide -- may be underestimated in individual climate models, according to a team of climate scientists.

Last Arctic ice refuge is disappearing

Science Daily - Tue, 11/12/2019 - 10:40
The oldest and thickest Arctic sea ice is disappearing twice as fast as ice in the rest of the Arctic Ocean, according to new research.

Coastlines' contribution to climate change might have been underestimated

Science Daily - Fri, 11/08/2019 - 15:25
Permafrost coasts make up about one third of the Earth's total coastline. As a result of accelerated climate change, whole sections of coastline rapidly thaw, and erode into the Arctic Ocean. A new study now shows that large amounts of carbon dioxide are potentially being produced along these eroding permafrost coastlines in the Arctic.

Turbulence creates ice in clouds

Science Daily - Fri, 11/08/2019 - 09:28
Vertical air motions increase ice formation in mixed-phase clouds. This correlation was predicted theoretically for a long time, but could now be observed for the first time in nature. Using laser and radar equipment, the team measured the vertical air velocity and ice formation in thin mixed-phase clouds.

Unless warming is slowed, emperor penguins will be marching towards extinction

Science Daily - Thu, 11/07/2019 - 15:07
Emperor penguins are some of the most striking and charismatic animals on Earth, but a new study has found that a warming climate may render them extinct by the end of this century.

Melting Arctic sea ice linked to emergence of deadly virus in marine mammals

Science Daily - Thu, 11/07/2019 - 10:29
Scientists have linked the decline in Arctic sea ice to the emergence of a deadly virus that could threaten marine mammals in the North Pacific, according to a study.

Scientists declare climate emergency, establish global indicators for effective action

Science Daily - Tue, 11/05/2019 - 09:44
A global coalition of scientists says 'untold human suffering' is unavoidable without deep and lasting shifts in human activities that contribute to greenhouse gas emissions and other factors related to climate change.

Changes in high-altitude winds over the South Pacific produce long-term effects

Science Daily - Tue, 11/05/2019 - 09:44
In the past million years, the high-altitude winds of the southern westerly wind belt, which spans nearly half the globe, didn't behave as uniformly over the Southern Pacific as previously assumed. Instead, they varied cyclically over periods of ca. 21,000 years. A new study has now confirmed close ties between the climate of the mid and high latitudes and that of the tropics in the South Pacific.

Sea levels to continue rising after Paris agreement emission pledges expire in 2030

Science Daily - Mon, 11/04/2019 - 14:56
Sea levels will continue to rise around the world long after current carbon emissions pledges made through the Paris climate agreement are met and global temperatures stabilize, a new study indicates.

Two million-year-old ice provides snapshot of Earth's greenhouse gas history

Science Daily - Wed, 10/30/2019 - 14:58
Two million-year old ice from Antarctica recently uncovered by a team of researchers provides a clearer picture into the connections between greenhouse gases and climate in ancient times and will help scientists understand future climate change.

Alongside Ötzi the Iceman: A bounty of ancient mosses and liverworts

Science Daily - Wed, 10/30/2019 - 14:14
Buried alongside the famous Ötzi the Iceman are at least 75 species of bryophytes -- mosses and liverworts -- which hold clues to Ötzi's surroundings, according to a new study.

Reframing Antarctica's meltwater pond dangers to ice shelves and sea level

Science Daily - Fri, 10/25/2019 - 12:04
On Antarctica, meltwater ponds riddle a kilometer-thick, 10,000-year-old ice shelf, which shatters just weeks later. The collapse shocks scientists and unleashes the glacier behind the ice shelf, driving up sea level. A new study puts damage by meltwater ponds to ice shelves and the ensuing threat to sea level into cool, mathematical perspective.

Did an extraterrestrial impact trigger the extinction of ice-age animals?

Science Daily - Fri, 10/25/2019 - 10:03
Based on research at White Pond near Elgin, South Carolina, archaeologists present new evidence of a controversial theory that suggests an extraterrestrial body crashing to Earth almost 13,000 years ago caused the extinction of many large animals and a probable population decline in early humans.

The shelf life of pyrite

Science Daily - Thu, 10/24/2019 - 11:26
What exactly triggers the increase in carbon dioxide concentrations that causes the transition from a glacial stage to a warm stage is not fully understood. Scientists have developed a new model in which the weathering of pyrite, a common mineral containing sulfur, plays a key role.


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